PURIFICATION METHODS USING SORBENTS AND PRESSURIZED LOW-POLARITY WATER EXTRACTION

Abstract

A method for separating, purifying, and recovering components from a liquid feedstock. The method steps include (i) commingling the liquid feedstock with a sorbent whereby one or more components in the liquid feedstock are bound onto the sorbent, thereby producing a loaded sorbent; (ii) packing the loaded sorbent into a first temperature-controlled pressure-resistant column; (iii) sealably engaging the first temperature-controlled pressure-resistant column with a supply of water, and cooling equipment for receiving a flow of an eluate from the temperature-controlled pressure-resistant column; (iv) from the supply of water, producing a first flow of PLP water at a first selected temperature; (v) flowing the first flow of PLP water through the temperature-controlled pressure-resistant column thereby producing a first flow of the eluate therefrom, said eluate containing the one or more components; (vi) cooling the first flow of the eluate; and (vii) collecting the cooled first flow of the eluate.

Claims

1. A method for separating and recovering components from a liquid feedstock, comprising the steps of: packing a selected sorbent loaded with components from the liquid feedstock, into a first temperature-controlled pressure-resistant column; sealably engaging the first temperature-controlled pressure-resistant column with (i) a supply of water, and (ii) a cooling equipment for receiving a flow of an eluate from the temperature-controlled pressure-resistant column; from the supply of water, producing a first flow of pressurized low-polarity (PLP) water at a first selected temperature; flowing the first flow of PLP water through the temperature-controlled pressure-resistant column thereby producing a first flow of the eluate therefrom, said eluate containing the one or more components; cooling the first flow of the eluate; and collecting the cooled first flow of the eluate.

2. The method according claim 1, additionally comprising a step of commingling the liquid feedstock with the selected sorbent whereby one or more components in the liquid feedstock are bound onto the sorbent, thereby producing a loaded sorbent.

3. The method according claim 1, additionally comprising: producing a second flow of PLP water at a second selected temperature; flowing the second flow of PLP water through the first temperature-controlled pressure-resistant column thereby producing a second flow of the eluate therefrom, said eluate containing the one or more components; cooling the second flow of the eluate; and collecting the cooled second flow of the eluate.

4. A method according claim 3, additionally comprising: producing a third flow of PLP water at a third selected temperature; flowing the third flow of PLP water through the first temperature-controlled pressure-resistant column thereby producing a third flow of the eluate therefrom, said eluate containing the one or more components; cooling the third flow of the eluate; and collecting the cooled third flow of the eluate.

5. The method according claim 4, additionally comprising: producing at least one more flow of PLP water at one more selected temperature; flowing the at least one more flow of PLP water through the first temperature-controlled pressure-resistant column thereby producing at least one more flow of the eluate therefrom, said eluate containing the one or more components; cooling the at least one more flow of the eluate; and collecting the cooled at least one more flow of the eluate.

6. The method according to claim 1, wherein the loaded sorbent is additionally packed into a second temperature-controlled pressure-resistant column, said second temperature-controlled pressure-resistant column sealably engaged with the first temperature-controlled pressure-resistant column to receive therefrom the flow of the eluate from the first temperature-controlled pressure-resistant column, maintaining the pressurized and heated flow of the eluant through the second temperature-controlled pressure-resistant column, collecting the flow of the eluant from the second temperature-controlled pressure-resistant column, and cooling the collected flow of the eluate.

7. The method according to claim 1, additionally comprising a step of further processing the eluate to produce a concentrate therefrom.

8. The method according to claim 1, additionally comprising a step of further processing the eluate to produce a dried powder therefrom.

9. The method according to claim 1, wherein the sorbent is a sorbent resin.

10. The method according to claim 9, wherein the sorbent resin is selected from the group consisting of poly(styrene-divinylbenzene) resins, poly(divinylbenzene resins, and crosslinked polyamide resins.

11. The method according to claim 1, wherein the sorbent is a silica bead sorbent or a molecular sieve or an activated carbon or a bentonite clay or a zirconium oxide or a naturally occurring zeolite or a synthetic zeolite or a diatomaceous earth.

12. The method according to claim 1, wherein the sorbent is a silica gel or a bonded C.sub.1-C.sub.18 silica of a magnesium silicate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be described in conjunction with reference to the following drawings in which:

[0012] FIG. 1 is a schematic drawing showing an example of a bench-scale pressurized low-polarity water extraction system interconnected with chromatography column filled with sorbent beads loaded with a mixture of compounds;

[0013] FIG. 2 is a schematic drawing showing an example of a commercial-scale pressurized low-polarity water system interconnected with two chromatography columns filled with sorbent bends loaded with a mixture of compounds;

[0014] FIG. 3 is a chart showing the desorption of total phenolic compounds from AMBERLITE FPX-66 resin with pressurized low-polarity water at 130 C. at 2, 3, and 4 BV/h flow rates as a function of the collected volume of water;

[0015] FIG. 4 is a chart showing the recovery of total phenolic compounds during desorption from AMBERLITE FPX-66 resin with pressurized low-polarity water at 130 C. at a 4 BV/h flow rate as a function of the collected volume of water;

[0016] FIG. 5A is a chart showing the desorption and recovery of caffeine, catechins, and total phenolics from AMBERLITE FPX-66 resin with PLP water eluant at 90 C., 130 C., and 180 C., and FIG. 5B is a chart showing the final concentration of these compounds in the eluates collected during the elutions;

[0017] FIG. 6A is a chart showing the desorption and recovery of caffeine, catechins, flavonols, and total phenolics from AMBERLITE XAD 7HP resin with PLP water eluant at 90 C., 130 C., and 180 C., and FIG. 6B is a chart showing the final concentration of these compounds in the eluates collected during the elutions;

[0018] FIG. 7A is a chart showing the desorption and recovery of caffeine, catechins, flavonols, and total phenolics from SEPABEADS SP 70 sorbent with PLP water eluant at 90 C., 130 C., and 180 C., and FIG. 7B is a chart showing the final concentration of these compounds in the eluates collected during the elutions;

[0019] FIG. 8A is a chart showing the desorption and recovery of caffeine, catechins, flavonols, and total phenolics from ZEOLITE C18 sorbent with PLP water eluant at 90 C., 130 C., and 180 C., and FIG. 8B is a chart showing the final concentration of these compounds in the eluates collected during the elutions;

[0020] FIG. 9 is a chart showing the recoveries of caffeine eluted from different sorbents during elution with PLP water;

[0021] FIG. 10 is a chart comparing the initial concentration of caffeine in a green tea extract loaded onto different sorbents with the final concentrations of caffeine in eluates collected from different sorbents during elution with PLP water

[0022] FIG. 11A is a chart comparing the sequential recoveries of caffeine, flavonols, and catechins from a green tea extract adsorbed onto AMBERLITE XAD7HP with PLP water at a first temperature of 75 C. and a second temperature of 145 C., and FIG. 11B is a chart comparing the initial concentrations of caffeine, flavonols, and catechins with the concentrations recovered with PLP water at 75 C. and at 145 C.; and

[0023] FIG. 12A is a chart comparing the recoveries of caffeine and dry matter from a guarana extract from AMBERLITE XAD7HP with PLP water at a first temperature of 80 C. and a second temperature of 140 C., and FIG. 12B is a chart comparing the initial concentrations of caffeine and dry matter with the concentrations recovered at the first extraction with PLP water at 80 C. and the second extraction with PLP water at 140 C.

DETAILED DESCRIPTION

[0024] The exemplary embodiments of present disclosure pertain to an apparatus for generating pressurized low-polarity water (PLP) interconnected with one or more pressure-resistant columns, to a system comprising an apparatus for generating pressurized low-polarity water (PLP) and one or more pressure-resistant columns, and use thereof for extraction and recovery of compounds from a mixture of compounds loaded onto sorbent beads.

[0025] As used herein, the singular forms a, an, and the include plural references unless the context clearly dictates otherwise.

[0026] As used herein, the terms optional or optionally or alternatively mean that the subsequently described apparatus, system, equipment, or material may or may not occur or be present, and that the description includes instances where the apparatus, system, equipment, or material occurs or is present, and instances where it does not occur or is not present.

[0027] Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limit of that range and any other stated or intervening value in that stated range, is encompassed within the disclosure. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges, and are also, encompassed within the disclosure, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the disclosure.

[0028] As used herein, the term pressurized low-polarity water, also referred to herein as PLP water means superheated subcritical water. Superheated subcritical water is water that is held by pressure in a liquid state at a temperature higher than its natural boiling point of 100 C. but less than its critical temperature of 374 C. Many of water's anomalous properties are due to very strong hydrogen binding. Over the superheated temperature range, the hydrogen bonds break thereby changing water's properties more than usually expected by increasing temperature alone. The viscosity and surface tension of water drop, and diffusivity increases with increasing temperature. Consequently, water becomes less polar and behaves more like an organic solvent such as methanol or ethanol. Solubility of organic materials and gases increases by several orders of magnitude and the water itself can act as a solvent, a reagent, and a catalyst. The changes in these properties can be manipulated by controllably increasing or decreasing pressure while controllably increasing temperature to just under the critical temperature of 374 C. In some cases, PLP water may be produced by controllably pressurizing water at temperatures lower than its natural boiling point of 100 C., for example, from the range of about 55 C. to about 99.99 C.

[0029] As used herein, the term critical temperature means the liquid-vapor critical point at which liquid water and its vapor can coexist. At higher temperatures, the water vapor cannot be liquified by pressure alone.

[0030] According to one embodiment of the present disclosure, there is provided an apparatus for separating and/or purifying a compound from a mixture of compounds, wherein the apparatus comprises equipment for generating a flow of PLP water, a temperature-controllable pressure-resistant column for containing therein a sorbent loaded with mixtures of compounds, a container for receiving therein an eluate from the temperature-controllable pressure-resistant column, a pressure-resistant conduit interconnecting the PLP equipment with the temperature-controllable pressure-resistant column, and a conduit interconnecting the pressure-resistant column with the eluate-receiving container. For clarity, the PLP water is an eluent for flowing through the temperature-controllable pressure-resistant column.

[0031] According to another embodiment of the present disclosure, there is provided a system for separating and purifying a compound from a mixture of compounds, wherein the system comprises a supply of water, equipment for generating a flow of PLP water from the supply of water, a temperature-controllable pressure-resistant column for containing therein a sorbent loaded with mixtures of compounds, a container for receiving therein an eluate from the temperature-controllable pressure-resistant column, a pressure-resistant conduit interconnecting the PLP equipment with the temperature-controllable pressure-resistant column, and a conduit interconnecting the temperature-controllable pressure-resistant column with the eluate-receiving container. For clarity, the PLP water is an eluent for flowing through the temperature-controllable pressure-resistant column.

[0032] According to another embodiment of the present disclosure, there is provided a system for separating and purifying a compound from a mixture of compounds, wherein the system comprises a supply of water, equipment for generating a flow of PLP water from the supply of water, a first temperature-controllable pressure-resistant column for receiving and containing therein a selected sorbent, a pressure-resistant conduit interconnecting the PLP equipment with the first temperature-controllable pressure-resistant column, a second temperature-controllable pressure-resistant column for receiving and containing therein a selected sorbent, a pressure-resistant conduit interconnecting the first temperature-controllable pressure-resistant column with the second temperature-controllable pressure-resistant column, a container for receiving therein an eluate from the second temperature-controllable pressure-resistant column, and a pressure-resistant conduit interconnecting second temperature-controllable pressure-resistant chromatography column with the eluate-receiving container. According to one aspect, the system may additionally comprise one or more temperature-controllable pressure-resistant columns for receiving and containing therein a selected sorbent, for example three columns, four columns, five columns, six columns, or more, wherein the first temperature-controllable pressure-resistant column is interconnected to the second temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the second temperature-controllable pressure-resistant column is optionally interconnected to the third temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the third temperature-controllable pressure-resistant column is optionally interconnected to the fourth temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the fourth temperature-controllable pressure-resistant column is optionally interconnected to the fifth temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the fifth temperature-controllable pressure-resistant column is optionally interconnected to the sixth temperature-controllable pressure-resistant column with a pressure-resistant conduit. Each of the additional temperature-controllable pressure-resistant columns may be interconnected to a water supply and/or a supply of PLP water. Each of the additional temperature-controllable pressure-resistant columns may be provided with valve-controllable conduit for discharging a flow of eluate therefrom. For clarity, the PLP water is an eluent for flowing through the temperature-controllable pressure-resistant columns. Also note that the PLP equipment can be used to maintain the first and/or second and/or third and/or fourth eluates as PLP eluate while they are flowing through a temperature-controllable pressure-resistant column. PLP eluate means superheated subcritical eluate.

[0033] According to another embodiment of the present disclosure, there is provided a system for extraction and recovery of components from biomass feedstocks, wherein the system comprises a supply of water, equipment for generating a flow of PLP water from the supply of water, a temperature-controllable pressure-resistant reaction column for receiving and containing therein a biomass feed stock, a temperature-controllable pressure-resistant column for receiving and containing therein a sorbent, a container for receiving therein an eluate from the temperature-controllable pressure-resistant column, a pressure-resistant conduit interconnecting the PLP equipment with the temperature-controllable pressure-resistant reaction column, a pressure-resistant conduit interconnecting the temperature-controllable pressure-resistant reaction column with the temperature-controllable pressure-resistant column, and a pressure-resistant conduit interconnecting the temperature-controllable pressure-resistant column with the eluate-receiving container. According to one aspect, the system may additionally comprise two or more temperature-controllable pressure-resistant columns for receiving and containing therein a selected sorbent, for example three columns, four columns, five columns, six columns, or more, wherein the first temperature-controllable pressure-resistant column is interconnected to the second temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the second temperature-controllable pressure-resistant column is optionally interconnected to the third temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the third temperature-controllable pressure-resistant column is optionally interconnected to the fourth temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the fourth temperature-controllable pressure-resistant column is optionally interconnected to the fifth temperature-controllable pressure-resistant column with a pressure-resistant conduit, wherein the fifth temperature-controllable pressure-resistant column is optionally interconnected to the sixth temperature-controllable pressure-resistant column with a pressure-resistant conduit. Each of the additional temperature-controllable pressure-resistant columns may be interconnected to a water supply and/or a supply of PLP water. Each of the additional temperature-controllable pressure-resistant columns may be provided with valve-controllable conduit for discharging a flow of eluate therefrom. For clarity, the PLP water is an eluent for flowing through the temperature-controllable reaction vessel and the temperature-controllable pressure-resistant column. Also note that the PLP equipment can be used to maintain the first and/or second and/or third and/or fourth eluates as PLP eluate while they are flowing through a temperature-controllable pressure-resistant column. PLP eluate means superheated subcritical eluate.

[0034] According to another embodiment of the present disclosure, there is provided a method for separating and purifying a compound from a mixture of compounds, wherein the method comprises the steps of: [0035] (i) commingling a solution containing a mixture of compounds with a selected sorbent to bind the compounds to the sorbent thereby loading the sorbent and then washing the loaded sorbent with water one or more times to remove any excess compounds that haven't bound to the sorbent; [0036] (ii) placing the loaded sorbent into the temperature-controllable pressure-resistant column; [0037] (iii) from a flow of water, producing a first flow of PLP water at a first selected temperature with the PLP equipment; [0038] (iv) flowing the PLP water for a selected period of time through the loaded sorbent in the pressure-resistant column; and [0039] (v) collecting an eluate flowing out of the pressure-resistant column.

[0040] According to one aspect, the method additionally comprises a step of producing a second flow of PLP water at a second selected temperature with the PLP equipment, and flowing said second flow of PLP water though the loaded sorbent in the pressure-resistant column for a second selected period of time. The method may optionally comprise a step of producing a third flow of PLP water at a third selected temperature with the PLP equipment, and flowing said third flow of PLP water though the loaded sorbent in the pressure-resistant column for a third selected period of time. The method may optionally comprise additional steps of producing additional flows of PLP water at additional temperatures and flowing said PLP water through the loaded sorbent in the pressure-resistant column for additional selected periods of time.

[0041] According to another embodiment of the present disclosure, there is provided a method for separating and purifying a compound from a mixture of compounds, wherein the method comprises the steps of: [0042] (i) commingling a solution containing the mixture of compounds with a selected first sorbent to bind the compounds to the first sorbent thereby loading the first sorbent and then washing the loaded sorbent with water one or more times to remove any excess compounds that haven't bound to the first sorbent; [0043] (ii) placing the loaded first sorbent into a first temperature-controllable pressure-resistant column; [0044] (iii) from a flow of water, producing a first flow of PLP water at a first selected temperature with the PLP equipment and flowing said first flow of PLP water through the first temperature-controllable pressure-resistant column thereby producing a first flow of PLP eluate therefrom; [0045] (iv) conditioning a second temperature-controllable pressure-resistant column containing a selected second sorbent by flowing therethrough a supply of water heated to the first selected temperature, said second temperature-controllable pressure-resistant column interconnected to the first temperature-controllable pressure-resistant column; [0046] (v) flowing the first PLP eluate flow discharged from the first temperature-controllable pressure-resistant column into and therethrough the second temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0047] (vi) collecting a second eluate flowing from the second temperature-controllable pressure-resistant column.

[0048] According to one aspect, the method may optionally comprise the additional steps of: [0049] (vii) conditioning a third temperature-controllable pressure-resistant column containing a selected third sorbent by flowing therethrough a supply of water heated to the first selected temperature, said third temperature-controllable pressure-resistant column interconnected to the second temperature-controllable pressure-resistant column; [0050] (viii) flowing the second PLP eluate flow discharged from the second temperature-controllable pressure-resistant column into and therethrough the third temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0051] (ix) collecting a third eluate flowing from the third temperature-controllable pressure-resistant column.

[0052] According to another aspect, the method may optionally comprise the additional steps of: [0053] (x) conditioning a fourth temperature-controllable pressure-resistant column containing a selected fourth sorbent by flowing therethrough a supply of water heated to the first selected temperature, said fourth temperature-controllable pressure-resistant column interconnected to the third temperature-controllable pressure-resistant column; [0054] (xi) flowing the third PLP eluate flow discharged from the second temperature-controllable pressure-resistant column into and therethrough the fourth temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0055] (xii) collecting a fourth eluate flowing from the fourth temperature-controllable pressure-resistant column.

[0056] It is optional if so desired, to raise the temperature in any one of the second or third or fourth temperature-controllable pressure-resistant columns to a second selected temperature for flowing a PLP eluate therethrough. If a second temperature was selected for flowing the first PLP eluate therethrough the second temperature-controllable pressure-resistant column, it is optional if so desired, to raise the temperature in any one of the third or fourth temperature-controllable pressure-resistant columns to a third selected temperature for flowing a PLP eluate therethrough.

[0057] According to another embodiment of the present disclosure, there is provided a method for separating and purifying a compound from a mixture of compounds, wherein the method comprises the steps of: [0058] (i) conditioning a temperature-controllable pressure-resistant column containing therein a sorbent by flowing a supply of water therethrough; [0059] (ii) flowing a solution containing a mixture of compounds through the temperature-controllable pressure-resistant column to bind the compounds to the conditioned sorbent thereby loading the sorbent, [0060] (iii) flowing a supply of water through the temperature-controllable pressure-resistant column to remove unbound compounds from the loaded sorbent, [0061] (iv) increasing the temperature of the water supply flowing through the temperature-controllable pressure-resistant column until a selected temperature is reached. [0062] (v) flowing a supply of PLP water heated to the selected temperature through the temperature-controllable pressure-resistant column for a first selected period of time, [0063] (vi) collecting an eluate flowing out of the pressure-resistant column.

[0064] According to one aspect, the method may comprise an additional step of heating the supply of PLP water to a second selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a second selected period of time and collecting an eluant discharged therefrom. If so desired, the method may comprise an additional step of heating the supply of PLP water to a third selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a third selected period of time and collecting an eluant discharged therefrom. If so desired, the supply of PLP water may be heated to additional selected temperatures wherein each additional selected temperature is flowed through the temperature-controllable pressure-resistant column and an eluant discharged therefrom is collected.

[0065] According to another embodiment of the present disclosure, there is provided a method for separating and purifying a compound from a mixture of compounds, wherein the method comprises the steps of: [0066] (i) conditioning a first temperature-controllable pressure-resistant column containing therein a selected first sorbent by flowing a supply of water therethrough; [0067] (ii) flowing a solution containing a mixture of compounds through the first temperature-controllable pressure-resistant column to bind the compounds to the conditioned first sorbent thereby loading the sorbent thereby loading the first sorbent, [0068] (iii) flowing the supply of water through the first temperature-controllable pressure-resistant column to remove unbound compounds from the loaded first sorbent, [0069] (iv) increasing the temperature of the water supply flowing through the first temperature-controllable pressure-resistant column until a selected temperature is reached. [0070] (v) flowing a supply of PLP water heated to the selected temperature through the first temperature-controllable pressure-resistant column for a first selected period of time thereby producing a flow of first eluate therefrom, [0071] (vi) conditioning a second temperature-controllable pressure-resistant column containing a selected second sorbent by flowing therethrough the supply of water heated to the first selected temperature, then flowing a supply of PLP water therethrough, said second temperature-controllable pressure-resistant column interconnected to the first temperature-controllable pressure-resistant column; [0072] (vii) flowing the first PLP eluate flow discharged from the first temperature-controllable pressure-resistant column into and therethrough the second temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0073] (viii) collecting a second eluate flowing from the second temperature-controllable pressure-resistant column.

[0074] According to one aspect, the method may optionally comprise the additional steps of: [0075] (ix) conditioning a third temperature-controllable pressure-resistant column containing a selected third sorbent by flowing therethrough a supply of water heated to the first selected temperature, then flowing a supply of PLP water therethrough, said third temperature-controllable pressure-resistant column interconnected to the second temperature-controllable pressure-resistant column; [0076] (x) flowing the second eluate flow discharged from the second temperature-controllable pressure-resistant column into and therethrough the third temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0077] (xi) collecting a third eluate flowing from the third temperature-controllable pressure-resistant column.

[0078] According to another aspect, the method may optionally comprise the additional steps of: [0079] (xii) conditioning a fourth temperature-controllable pressure-resistant column containing a selected fourth sorbent by flowing therethrough a supply of water heated to the first selected temperature, then flowing a supply of PLP water therethrough, said fourth temperature-controllable pressure-resistant column interconnected to the third temperature-controllable pressure-resistant column; [0080] (xiii) flowing the third PLP eluate flow discharged from the second temperature-controllable pressure-resistant column into and therethrough the fourth temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0081] (xiv) collecting a fourth eluate flowing from the fourth temperature-controllable pressure-resistant column.

[0082] According to one aspect, the method may comprise an additional step of heating the supply of PLP water to a second selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a second selected period of time and collecting an eluant discharged therefrom. If so desired, the method may comprise an additional step of heating the supply of PLP water to a third selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a third selected period of time and collecting an eluant discharged therefrom. If so desired, the supply of PLP water may be heated to additional selected temperatures wherein each additional selected temperature is flowed through the temperature-controllable pressure-resistant column and an eluant discharged therefrom is collected.

[0083] According to another embodiment of the present disclosure, there is provided a method for extraction and recovery of components from biomass feedstocks, wherein the method comprises the steps of: [0084] (i) loading a biomass feedstock into a temperature-controllable pressure-resistant reaction vessel; [0085] (ii) from a flow of water, producing a supply of PLP water at a first selected temperature with the PLP equipment and flowing said PLP water through the first temperature-controllable pressure-resistant column thereby producing a flow of PLP extract containing therein a mixture of solubilized compounds extracted therefrom the biomass feedstock; [0086] (iii) conditioning a first temperature-controllable pressure-resistant column by flowing a supply of water therethrough at the first selected temperature, then flowing a supply of PLP water therethrough; [0087] (iv) flowing the PLP extract through the first temperature-controllable pressure-resistant column for a first selected period of time while maintaining the PLP conditions at the first selected temperature thereby producing a flow of first eluate therefrom; and [0088] (v) collecting the first eluate.

[0089] According to one aspect, the method may optionally comprise the additional steps of: [0090] (vi) conditioning a second temperature-controllable pressure-resistant column containing a selected second sorbent by flowing therethrough the supply of water heated to the first selected temperature, then flowing a supply of PLP water therethrough, said second temperature-controllable pressure-resistant column interconnected to the first temperature-controllable pressure-resistant column; [0091] (vii) flowing the first PLP eluate flow discharged from the first temperature-controllable pressure-resistant column into and therethrough the second temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0092] (viii) collecting a second eluate flowing from the second temperature-controllable pressure-resistant column.

[0093] According to another aspect, the method may optionally comprise the additional steps of: [0094] (ix) conditioning a third temperature-controllable pressure-resistant column containing a selected third sorbent by flowing therethrough the supply of water heated to the first selected temperature, then flowing a supply of PLP water therethrough, said third temperature-controllable pressure-resistant column interconnected to the second temperature-controllable pressure-resistant column; [0095] (x) flowing the first PLP eluate flow discharged from the second temperature-controllable pressure-resistant column into and therethrough the third temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0096] (xi) collecting a third eluate flowing from the third temperature-controllable pressure-resistant column.

[0097] According to another aspect, the method may optionally comprise the additional steps of: [0098] (xii) conditioning a fourth temperature-controllable pressure-resistant column containing a selected fourth sorbent by flowing therethrough the supply of water heated to the first selected fourth temperature-controllable pressure-resistant column interconnected to the third temperature-controllable pressure-resistant column; [0099] (xiii) flowing the third PLP eluate flow discharged from the third temperature-controllable pressure-resistant column into and therethrough the fourth temperature-controllable pressure-resistant column while maintaining the PLP conditions at the first selected temperature; and [0100] (xiv) collecting a fourth eluate flowing from the fourth temperature-controllable pressure-resistant column.

[0101] According to one aspect, the method may comprise an additional step of heating the supply of PLP water to a second selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a second selected period of time and collecting an eluant discharged therefrom. If so desired, the method may comprise an additional step of heating the supply of PLP water to a third selected temperature and flowing said heated PLP water supply through the temperature-controllable pressure-resistant column for a third selected period of time and collecting an eluant discharged therefrom.

[0102] The PLP water may be produced by concurrently applying to a flow of water (i) a pressure from the range of about 100 psi to about 1,300 psi, and (ii) a temperature from the range of about 50 C. to about 370 C. Suitable pressure/temperature combinations are pressures from the range of about 300 psi to 1,000 psi and temperatures from about 60 C. to about 300 C. Particularly suitable pressure/temperature combinations are pressures from the range of about 300 psi to 1,000 psi and temperatures from about 70 C. to about 225 C.

[0103] The apparatus, systems, and methods disclosed herein can be used with a variety of types of ion-exchange resins, for example strongly acidic ion-exchange resins or weakly acid ion-exchange resins or strongly basic ion-exchange resins or weakly basic ion-exchange resins. The ion-exchange resins may be either cationic resins or anionic resins.

[0104] The apparatus, systems, and methods disclosed herein can be used with a variety of types of sorbents. Suitable sorbents include different sized and pored silica beads for example with 1-8 mm bead diameters, synthetic sodium alumina silicates (also referred to as molecular sieves), silica gels, bonded C.sub.1-C.sub.18 silicas, magnesium silicate for example FLORISIL (FLORISIL is a registered trademark of U.S. Silica Co. Corp., Frederick, Md., USA), activated carbon, bentonite, zirconium oxide, natural zeolites, synthetic zeolites, diatomaceous earths, and the like.

[0105] The apparatus, systems, and methods disclosed herein can be used with a variety of types of sorbent resins. Suitable sorbent resins include poly(styrene-divinylbenzene) resins, 100% poly(divinylbenzene (DVB) resins, or crosslinked polyamides, such as those available from SORBTECH Sorbent Technologies Inc. (Norcross, Ga., USA), and the like.

[0106] The apparatus, systems, and methods disclosed herein can be used to separate and/or recover and/or purify a wide variety of soluble compounds that comprise ionic charges, for example, metals, rare earths, inorganic ions, organic compounds, phytochemicals, and the like.

[0107] It is within the scope of the present disclosure to further process the eluants produced within and collected from the apparatus and systems disclosed herein by the methods disclosed herein, to reduce the volumes of the eluants using apparatus and methods known to those skilled in this art, to produce liquid concentrates. It is also within the scope of the present disclosure to dry the eluants produced within and collected from the apparatus and systems disclosed herein by the methods disclosed herein, using apparatus and methods known to those skilled in this art, to produce powders.

[0108] The following examples describing separation of phenolic compounds and catechins from plant extracts are provided for illustration of how the apparatus, systems, and methods of the present disclosure, may be used.

Example 1: Laboratory-Scale Apparatus for Generating a Flow of PLP Water Through a Chromatography Column

[0109] An example of a laboratory-scale system 5 according to one embodiment of the present disclosure is shown in FIG. 1 and generally comprises a water supply 10, a pump 15 (for example, a Waters 515 model, Milford, Mass.), a temperature-controlled oven 20 (for example, a Model 851F, Fisher Scientific, Pittsburgh, Pa.), a preheating coil 25 (for example, 2.0 m stainless steel tubing with 3.2 mm () o.d.), a pressure-resistant column 30, a 1.0 m cooling coil 40 (stainless steel tubing with 3.2 mm () o.d.), a back-pressure regulator 45 with a cartridge of 5.2 MPa (750 psi) (Upchurch Scientific, Oak Harbor, Wash.) to maintain pressure in the system, and a collection vessel 50. A pressure-relief valve 35 was also provided interposed the preheating coil 25 and the pressure-resistant column 30. Stainless steel tubing (3.2 mm () o.d.) and connectors were used to connect the equipment pieces (i.e., the pump, pressure-resistant column, and back-pressure regulator).

Example 2: Commercial-Scale Apparatus for Generating a Flow of PLP Water Through One or More Large-Scale Chromatography Column(s)

[0110] Another exemplary PLPW apparatus 100 interconnected with two large-scale chromatography columns is shown in FIG. 2, wherein the chromatography columns 120, 121 have a maximum operating pressure of 6200 kPa (900 psi) at an operating temperature of 204 C. The column jackets are designed for a lower maximum operating pressure of 2,580 kPa (375 psi) at an operating temperature of 204 C. to prevent crushing of the column if the jacket is pressurized and the column is not. However, because several other pieces of equipment such as the accumulators 125, 126 have been certified for temperatures and pressures less than those of the chromatography columns 120, 121, the maximum operating pressure and temperature of this two-column system, as a whole, is set at 5500 kPa (800 psi) and 180 C., and the maximum operating pressure of the jacket circuit 150 is 2400 kPa (350 psi). The specifications and descriptions for the major parts of the PLPW system shown in FIG. 2 are listed in Tables 1 to 6.

[0111] The process flow 118 for the pressurized low-polarity water extraction system is shown in FIG. 2. Process water is drawn from the water reservoir 110 with a positive displacement pump 112 (i.e., a process pump) and passed through heat exchanger 114 where the process water is first used to cool and recover heat from the liquid extract exiting the system. The partially heated water then enters the immersion heater 116, where it is heated to the desired process temperature. The system is controlled to direct the heated water either through the column jackets to warm the equipment, or through the chromatography column 120 packed with a loaded adsorbent to be extracted. The exiting liquid extract/process water flows back through heat exchanger 114 where energy is recovered and the product temperature is lowered to below the boiling point before reaching back-pressure regulator 151. The purpose of the back-pressure regulator 151 is to maintain the system pressure at a point above the saturation pressure at the operating processing temperature to prevent the formation of steam. After back-pressure regulator 151 there is an additional heat exchanger 130 that may be used to control the final temperature of the outgoing liquid extract/process water. This heat exchanger 130 is connected to another water source, whereby the flow can be adjusted by a valve to cool the exiting liquid to the desired temperature. The liquid extract/process water is directed to either the collection vessel 132 or waste water vessel 134 for use elsewhere in the process.

[0112] There are several flow circuits within the extraction system. The flow circuit is selected with the automated control system, which controls the valve sequencing to operate each circuit.

Hot Bypass Circuit:

[0113] The hot bypass circuit isolates the chromatography columns 120, 121 and jackets from the rest of the PLPW apparatus. The process pump 112 passes water from the water reservoir 110 through heat exchanger 114 (input side), the immersion heater 116, through the bypass valve BVH, heat exchanger 114 (product side), back-pressure regulator 151, heat exchanger 130, and out of the system to the waste water vessel 134. The purpose of the hot bypass circuit is to pressurize and maintain the system pressure, and to adjust the process water temperature before the water is introduced into the other circuits.

Warming Circuit:

[0114] The warming circuit pushes process water through the chromatography column jackets. The process pump 112 passes water through the input side of heat exchanger 114, the immersion heater 116, the column jacket, the output side out heat exchanger 114, through LPV and back-pressure regulator 153, heat exchanger 130, and out of the system to the waste water vessel 134. The purpose of this circuit is to warm the chromatography column 120 to the desired processing temperature in order to minimize the loss of heat from the processing water to the equipment during extraction. It is to be noted that this circuit could be separated from the other circuits and run independently. This is accomplished by adding another pump (not shown), heat exchanger (not shown), and immersion heater (not shown). Alternatively, the jackets may be converted to use steam from a utilities facility either with steam as the heating medium within the jacket, or through the use of a heat exchanger and water pump to indirectly heat water for the jacket.

Processing:

[0115] During the processing circuit, the process water flows through the chromatography column (e.g., 120 or 121) packed with an adsorbent loaded with a mixture of compounds. The process pump 112 pushes water through the input side of heat exchanger 114, the immersion heater 116, the column 120 or 121, the product side of heat exchanger 114, back-pressure regulator 131, heat exchanger 130, and out of the PLPW apparatus to the collection vessel 732. The purpose of the processing circuit is to solubilise and extract components from PLP extracts that were bound to the adsorbents packed into the chromatography columns 120, 121. The PLP water travels through the chromatography column 720 or 721 from its bottom to its top in a single pass. The least concentrated PLP water first passes through the most extracted adsorbent, thus maximizing the amount of product extracted. In addition, due to the continuous flow-through nature of the extraction system, product is constantly removed from the system with low residence times while exposed to the operating conditions, thus reducing the amount of potential product degradation.

Cooling Circuit:

[0116] The cooling circuit cools the chromatography columns 120, 121 down after the compounds bound to the adsorbents have been fully extracted. Water in the first cooling circuit 140 is taken from the water reservoir 110 or waste water vessel 134 and pumped by the cooling pump 142 through the input side of heat exchanger 144, the bypass valve BVC, and back through the product side of heat exchanger 144, back-pressure regulator 45 and out of the PLPW apparatus to a drain. The purpose of first cooling circuit 40 is to pressurize and maintain the system pressure in the cooling circuit equal to the column pressure from the extraction.

[0117] In the second cooling circuit, the PLP water flows through the chromatography column 120 or 121 packed with the spent (i.e., extracted) adsorbent whereby the cooling pump 142 flows water through the input side of heat exchanger 144, the reaction column 120 or 121, the product side of heat exchanger 144, back-pressure regulator 155, and out of the PLPW apparatus into the drain. The purpose of the second cooling circuit is to lower the temperatures of the extracted adsorbent and the chromatography column 120 or 121 below the saturation temperature to allow for safe removal of the extracted adsorbent. Once the temperature is low enough, the PLPW apparatus can be switched back to the first cooling circuit, the chromatography column can be drained of water, the extracted adsorbent removed, and chromatography column can be filled with fresh loaded adsorbent for the next extraction.

[0118] It is to be noted that those skilled in these arts will be able to adjust and/or modify the various equipment options disclosed herein for producing a PLPW apparatus that comprises at least two chromatography columns wherein each chromatography column is provided with piping infrastructures communicating with at least a water supply, one or more heaters or heat exchangers for heating the water, and pumps for pressurizing the water to a temperature in the range of about 50 C. to about 65 C., from about 50 C. to about 85 C., from about 50 C. to about 100 C., from about 50 C. to about 125 C., from about 55 C. to about 150 C., from about 55 C. to about 175 C., from about 55 C. to about 185 C., from about 55 C. to about 195 C., from about 55 C. to about 205 C., from about 55 C. to about 225 C., from about 55 C. to about 250 C., from about 55 C. to about 275 C., from about 55 C. to about 300 C., from about 55 C. to about 325 C., from about 55 C. to about 350 C., from about 55 C. to about 375 C., from about 55 C. to about 400 C., and therebetween, and a pressure from the range of about 100 psi to about 500 psi, from about 125 psi to about 450 psi, from about 150 psi to about 400 psi, from about 165 psi to about 375 psi, from about 175 psi to about 350 psi, from about 175 psi to about 325 psi, from about 175 psi to about 300 psi, from about 175 psi to about 275 psi, from about 175 psi to about 250 psi, from about 175 psi to about 225 psi, and therebetween.

TABLE-US-00001 TABLE 1 Properties of a two-column PLPW apparatus Characteristic Biomass capacity (35 kg; 46% Inner diameter 20 cm Length 203 cm Column volume 65,700 cm.sup.3 Sample mass (dry 18,900 g Bed depth 162 cm Sample volume 52,400 cm.sup.3 Sample bulk density 0.33 g/cm.sup.3 Length to diameter ratio* 5.4:1 Solvent: solid ratio 7.5 mL/g Volume collected 142,000 mL Flow rate 4,000 mL/min Superficial velocity 13.4 cm/min Residence time** 12.1 min Extraction time*** 30.0 min *where length = bed depth **residence time = bed depth/superficial velocity ***extraction time = volume collected/flow rate

TABLE-US-00002 TABLE 2 Electrical equipment for a two-column PLPW apparatus. Name Power Voltage/Phase/Freq Specification Process Pump 2 HP 208 V/3/60 Hz Hydra-Cell M03 with 2 hp Baldor motor, Baldor VFD, Hydra-Cell C62 pulsation dampener Cooling Pump 2 HP 208 V/3/60 Hz Hydra-Cell M03 with 2 hp Baldor motor, Baldor VFD, Hydra-Cell C62 pulsation dampener Immersion Heater w/Panel 123 kW 600 V/3/60 Hz Wattco model#MFLS15123X1050-TM Actuators (QTY 18) 24 VDC TBD/TBD/TBD Promation P1-24N4 System Control Panel N/A 120/208 V/3/60 Hz Harlok/Cedarcore custom panel, includes parts and labour

TABLE-US-00003 TABLE 3 Heat exchangers for a two-column PLPW apparatus. Name Description Specification Heat Exchanger 1 Warming Circuit (recovery) Sentry model# WSW8221U Special Heat Exchanger 2 City Water (safety) Sentry model# DTC-SSB/SSD-8-1-1 Heat Exchanger 3 Cooling Circuit (recovery) Sentry model# WSW8221U Special

TABLE-US-00004 TABLE 4 Valves for a two-column PLPW apparatus. Name Description Specification BVH Heating Circuit Bypass Valve MAS G-3-HD-FS BVC Cooling Circuit Bypass Valve MAS G-3-HD-FS ICV1 Cooling Circuit Inlet Valve, Column 1 MAS G-3-HD-FS ICV2 Cooling Curcuit Inlet Valve, Column 2 MAS G-3-HD-FS IHV1 Heating Circuit Inlet Valve, Column 1 MAS G-3-HD-FS IHV2 Heating Circuit Inlet Valve, Column 2 MAS G-3-HD-FS OCV1 Cooling Circuit Outlet Valve, Column 1 MAS G-3-HD-FS OCV2 Cooling Circuit Outlet Valve, Column 2 MAS G-3-HD-FS OHV1 Heating Circuit Outlet Valve, Column 1 MAS G-3-HD-FS OHV2 Heating Circuit Outlet Valve, Column 2 MAS G-3-HD-FS JIV1 Jacket Inlet Valve, Column 1 MAS G-3-HD-FS JOV1 Jacket Outlet Valve, Column 1 MAS G-3-HD-FS JIV2 Jacket Inlet Valve, Column 2 MAS G-3-HD-FS JOV2 Jacket Outlet Valve, Column 2 MAS G-3-HD-FS CWV Cooling Water Valve MAS G-3-HD-FS CVV Collection Vessel Valve MAS G-3-HD-FS WWV Waste Water Valve MAS G-3-HD-FS LPV Low Pressure Valve (Jacket Operating) MAS G-3-HD-FS DV1 Drain Valve, Column 1 MAS G-3-HD-FS DV2 Drain Valve, Column 2 MAS G-3-HD-FS

TABLE-US-00005 TABLE 5 Mechanical regulators and safety valves for a two-column PLPW apparatus. Name Specification Pressure Setting Back Pressure Regulator A Equilibar EB2NL2 <750 psi (from nitrogen reference) Back Pressure Regulator B Equilibar EB2NL2 <750 psi (from nitrogen reference) Back Pressure Regulator C Equilibar EB2NL2 <350 psi (from nitrogen reference) Pressure Regulating Valve PP Hydra-Cell C62 750 psi < Set Point > 800 psi Pressure Regulating Valve CP Hydra-Cell C62 750 psi < Set Point > 800 psi Pressure Relief Valve R1 Consolidated 19000 Series 850 psi Pressure Relief Valve R2 Consolidated 19000 Series 850 psi Pressure Relief Valve J1 Consolidated 19000 Series 350 psi Pressure Relief Valve J2 Consolidated 19000 Series 350 psi Pressure Relief Valve IH Consolidated 19000 Series 850 psi Accumulator A Blacoh H2420A 750 psi Accumulator B Blacoh H2420A 750 psi Accumulator C Blacoh H2420A 350 psi Accumulator D Blacoh H2420A 350 psi

TABLE-US-00006 TABLE 6 Instrumentation for a two-column PLPW apparatus. Name Description Specification FM(H) Process Flowmeter, Process Circuit Burkert 8619 controller, SE30 sensor and gear fitting FM(C) Process Flowmeter, Cooling Circuit Burkert 8619 controller, SE30 sensor and gear fitting FS(H) Flow Switch, Process Circuit Burkert tuning fork 560986 PCO(J) Pressure Switch, Warming (Jackets) United Electric H100 Circuit PCO(H) Pressure Switch, Processing Circuit United Electric H100 PCO(C) Pressure Switch, Cooling Circuit United Electric H100 P(C1) Pressure, Column 1 Wika, 233.53 gauge, 2 IT(C1) Inlet Temperature, Column 1 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD OT(C1) Outlet Temperature, Column 1 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD P(J1) Pressure, Jacket 1 Wika, 233.53 gauge, 2 T(J1) Temperature, Jacket 1 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD P(C2) Pressure, Column 2 Wika, 233.53 gauge, 2 IT(C2) Inlet Temperature, Column 2 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD OT(C2) Outlet Temperature, Column 2 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD P(J2) Pressure, Jacket 2 Wika, 233.53 gauge, 2 T(J2) Temperature, Jacket 2 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD ET(C) Outlet Temperature, Cooling Circuit Trident PD743 meter, WESC12C29- 3E03.00C1A RTD BP(H) Back Pressure, Process Circuit Wika, 233.53 gauge, 2 BP(C) Back Pressure, Cooling Circuit Wika, 233.53 gauge, 2 IT(HE2) Inlet Temperature, Heat Exchanger 2 Trident PD765 meter, WESC12C29- 3E03.00C1A RTD OT(HE2) Outlet Temperature, Heat Exchanger 2 Trident PD743 meter, WESC12C29- 3E03.00C1A RTD

Example 3: Assessment of PLP Water-Desorption of Sorbent Resins

[0119] The following food-grade sorbents were used in the examples disclosed herein: [0120] an acrylic polymer, AMBERLITE XAD7HP (AMBERLITE is a registered trademark of Rohm and Haas Company Corp., Philadelphia, Pa., USA), [0121] a PS-DVB resin, AMBERLITE FPX66, [0122] a PS-DVB copolymer resin, SEPABEADS SP700 (SEPABEADS is a registered trademark of Mitsubishi Chemical Corp., Tokyo, Japan), [0123] a polymethacrylate resin, DIAION HP2MG (DIAION is a registered trademark of Mitsubishi Chemical Corp., Tokyo, Japan), [0124] a chemically modified PS-DVB polymer resin, SEPABEADS SP70, [0125] an irregular silica gel, ZEOPREP 60 (ZEOPREP is a registered trademark of Zeochem AG Aktiengesellschaft, Uetikon am See, Switzerland), and [0126] activated carbon (Prod. no. 43118, Alfa Aesar by Thermo Fisher Scientific, Ward Hill, Mass., USA).

[0127] The AMBERLITE XAD polymeric resins are nonpolar resins which are generally used for adsorption of organic substances from aqueous systems and polar solvents. The binding capacity of a resin for a particular material is affected by the dipole moment, the pore size and the surface area. Most AMBERLITE XAD resins are nonpolar and may be used over a pH range of 0-14 a with maximum usage temperature 480 F. The AMBERLITE XAD-7 is the only moderately polar XAD resin now available. It has been used to remove relatively polar compounds from non-aqueous solvents. For relatively low molecular weight (MW), AMBERLITE XAD-4 is currently suggested. Synthetic adsorbents can tolerate caustic sanitization that cannot be applied to alkyl-bonded silica gels.

[0128] The physicochemical characteristics of these sorbents are summarized in Table 7.

TABLE-US-00007 TABLE 7 Surface Pore area radius Resin Chemical nature Polarity (m.sup.2/g) (A) AMBERLITE XAD-7HP acrylic ester (dipole moderately 450 90 moment 1.8) polar DIAION HP 2MGL methacrylate ester- 470 170 based polymeric resin SEPABEADS SP 70 chemically modified nonpolar 800 70 polystyrene-DVB SEPABEADS SP700 polystyrene-DVB nonpolar 1200 90 AMBERLITE FPX 66 styrene-DVB nonpolar 700 250 FLORISIL activated magnesium nonpolar 289 silicate ZEOPREP 60-C18 irregular Silica gel nonpolar 500 60 Activated carbon highly porous nonpolar 500-1500 4 + 8 carbonaceous material mesh

[0129] The adsorption of phenolic compounds from green tea PLP extracts onto and from the sorbents listed in Table 7, were assessed as outlined in Examples 4-8.

Example 4: Effects of Flow Rate on PLP-Water Desorption of Phenolic Compounds from a Selected Sorbent

[0130] The objective of this study was to assess the efficiency of desorption of phenolic compounds bound to a selected sorbent using PLP water as the eluent solvent.

[0131] An extract comprising a mixture of phenolic compounds was solubilized and extracted from green tea leaf biomass using PLP water flowed through a PLP reaction vessel. Testing of the green tea PLP extract indicated that its total phenolic content was about 25 mg/mL.

[0132] AMBERLITE FPX-66 resin beads were thoroughly wetted following the manufacturer's instructions. 40 g of wetted resin beads were placed into a 250-mL Erlenmeyer flask, then 50 mL of the green tea extract were added to the wetted resin beads, after which, the Erlenmeyer flask was sealed. The resin beads and extract were mixed at 160 rpm for 1 h on an orbital shaker to load the resin beads with compounds from the green tea extract. The loaded resin beads were separated from the extract supernatant, and then washed twice with 30 mL of deionized water. The loaded resin beads were then transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends.

[0133] The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a selected temperature of 130 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 2 BV/h. Sample collection commenced at 5 min after desorption commenced, and then at 10, 15, 20, 25, 30, 40, 50, 60, 70, 85, 95, 110, 125, and 140 min.

[0134] The desorption process was repeated with a fresh batch of extract-loaded and washed AMBERLITE FPX-66 resin beads using a PLP water flow rate of 3 BV/h, and then repeated again with a fresh batch of extract-loaded and washed AMBERLITE FPX-66 resin beads using a PLP water flow rate of 4 BV/h.

[0135] The data in FIG. 3 show that similar amounts of total phenolics eluates were collected at the same desorption time intervals with the 3 BV/h and 4 BV/h flow rates. However, the 2 BV/h flow rate required a longer eluate collection time period but did not produce a better recovery than the other flow rates. The data in FIG. 4 show that a minimum collection volume of 4BV was required to extract most of the total phenolics that were bound to the AMBERLITE FPX-66 resin beads.

Example 5: Effects of Temperatures on PLP-Water Desorption of Phenolic Compounds from Selected Sorbents

[0136] The objective of this study was to assess the effects of different temperatures on PLP water desorption of phenolic compounds bound to selected sorbents.

5.1 PLP Extract Mixtures

[0137] A first extract comprising a mixture of phenolic compounds was solubilized and extracted from green tea leaf biomass using PLP water flowed through a PLP reaction vessel. A second extract comprising a mixture of phenolic compounds was solubilized and extracted from elderberry biomass using PLP water flowed through a PLP reaction vessel. The two extracts were then mixed together to produce a complex mixture of phenolic compounds. Testing of the complex green tea/elderberry PLP extract mixture indicated that its total phenolic content was about 12 mg/mL.

5.2 Preparation and Loading of Sorbents with Compounds from Complex Extract Mixtures

[0138] The following sorbents were tested in this example: (i) AMBERLITE FPX-66, (ii) AMBERLITE XAD 7, (iii) FLORISIL, (iv) ZEOPREP 60-C18, and (v) SEPABEADS SP70. Each of the sorbents was tested at three PLP water desorption temperatures i.e., 90 C., 130 C., and 180 C. Each of the resins was first washed, after which, the phenolic compounds in the complex green tea/elderberry PLP extract mixture were bound to the resin beads following the same process used in Example 1, whereby 40 g of wetted resin beads were placed into a 250-mL Erlenmeyer flask, then 50 mL of the green tea extract were added to the wetted resin beads, after which, the Erlenmeyer flask was sealed. The resin beads and extract mixture were mixed at 160 rpm for 1 h on an orbital shaker to load the resin beads with compounds from the green tea extract. The loaded resin beads were separated from the extract supernatant, and then washed twice with 30 mL of deionized water. The loaded resin beads were then transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends.

5.3 PLP Water Desorption of Loaded AMBERLITE FPX-66 Resin

[0139] Washed AMBERLITE FPX-66 resin loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV.

[0140] A fresh batch of washed AMBERLITE FPX-66 resin loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends that was then installed into the PLPW system. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a second selected temperature of 130 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a second eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV.

[0141] A fresh batch of washed AMBERLITE FPX-66 resin loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends that was then installed into the PLPW system. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a third selected temperature of 180 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a third eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV.

[0142] The three eluate samples were then analyzed for their content of (i) caffeine, (ii) catechins, (iii) flavonols, and (iv) total phenols. The analyses were carried out using an AGILENT HP 1100 series HPLC (AGILENT is a registered trademark of Agilent Technologies Inc., Santa Clara, Calif., USA). The chromatographic separations were carried out on a KINETIX RP C-18 column (2.6u, 100 , 1503 mm); Phenomenex, Torrance, Calif.), and with a PHENOMENEX Ultra guard column (C-18, 3 mm) (KINETIX AND PHENOMENEX are registered trademarks of Phenomenex Inc., Torrance, Calif., USA). HPLC analysis of 10-L samples of the three eluate samples were analyzed by RP-HPLC coupled with a photodiode array detector and signal at a temperature of 30 C., a flow rate of 0.5 mL/min, and absorbance measured at 280 nm, 320 nm, 360 nm, and 520 nm. Run times were 60 min with a post time of 2 min.

[0143] Caffeine and catechins were determined as EGCG equivalents of added peak areas of epigallocatechin (EGC), catechin, epicatechin, epigallocatechin gallate (EGCG), epicatechin gallate (E3G), and unknown peak at retention time (21 min) after EGCG time, cyanidin 3-sambubioside, and flavonols as rutin equivalents of added peak areas of major six flavonols. Contents were estimated by identifying the markers by comparison with standard peaks of retention times, and UV spectra. Marker contents were determined by standard curves of caffeine, EGCG, cyanidin-3-glucoside and rutin. Solvent A was 0.5% phosphoric acid in HPLC-grade water; Solvent B was HPLC-grade 100% acetonitrile.

TABLE-US-00008 Solvent gradient: Time (min) A (%) 0 93 2 93 7 89 20 89 30 83 54 73 56 5 58 5 60 93

[0144] The adsorption ratio (E) was calculated as a percentage of the total amount of the marker present in the initial extract.

E=(C.sub.oC.sub.e)Co 100(1)

where E was the adsorption ratio (percentage); C.sub.o and C.sub.e were initial and equilibrium concentrations (mg/L) of solute in the solution, respectively.

[0145] Desorption ratio was evaluated as a percentage of the amount adsorbed into the adsorbent,

D=(C.sub.dV.sub.d)(C.sub.oC.sub.e)Vo100(2)

where D was the desorption ratio (percentage), C.sub.d was the concentration of the solute in the desorption solution (mg/L), V.sub.d was the volume of the desorption solution (mL), and V.sub.o was the volume of the initial solution (mL).

[0146] Recovery (R) of the markers after purification was evaluated as a percentage of the total amount of the marker in the initial solution.

R=C.sub.dvdC.sub.ovo100(3)

where R was the recovery (percentage), C.sub.d, C.sub.o, and V.sub.d, V.sub.o were the same as described before.

[0147] The data in Table 8 show that there was an excellent adsorption ratio of the phenolic compounds from the complex green tea/elderberry PLP extract mixture onto AMBERLITE FPX-66 resin, and that PLP water eluent provided very good desorption ratios of the bound compounds from the AMBERLITE FPX-66 resin loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture. At the 180 C., the recoveries of total phenolics and caffeine were as high as 77%, and the recovery of catechins recovery was about 62%.

[0148] The data in FIG. 5A show the recovery of caffeine, catechins, and total phenolics from AMBERLITE FPX-66 resin with PLP water eluant at 90 C., 130 C., and 180 C. The data in FIG. 5B show the final concentration of caffeine, catechins, and total phenolics in eluates discharged from loaded AMBERLITE FPX-66 resin with PLP water eluant at 90 C., 130 C., and 180 C.

TABLE-US-00009 TABLE 8 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from AMBERLITE FPX-66 resin with PLP water eluant Adsorption Desorption Concentration Temp Marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (% w/w) FPX-66 90 Caffeine 99.27 8.06 8.00 5.38 3.00 0.56 130 99.17 27.38 27.15 5.39 4.98 0.33 180 99.39 77.52 77.04 5.36 9.23 0.01 FPX-66 90 Catechins 99.27 11.54 11.46 17.42 13.91 1.88 130 99.27 47.7 47.35 17.48 28.16 0.66 180 99.29 63.02 62.57 17.37 24.31 0.02 FPX-66 90 Flavonols 100 0 0 1.74 0 0.22 130 100 4.88 4.88 1.75 0.29 0.2 180 100 43.01 43.01 1.74 1.67 0.05 FPX-66 90 Total 96.4 23.84 22.98 43.07 68.95 3.08 130 Phenolics 95.87 55.64 53.34 43.21 78.41 1.32 180 95.9 77.39 74.22 42.93 71.26 0.16

5.4 PLP Water Desorption of Loaded AMBERLITE XAD 7HP Resin

[0149] Washed AMBERLITE XAD 7HP resin beads loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV. This process was repeated with a second stainless steel pressure-resistant column packed with fresh loaded AMBERLITE XAD 7HP resin beads with a second selected temperature of 130 C. for the desorption process thereby producing a second eluate sample. This process was repeated with a third stainless steel pressure-resistant column packed with fresh loaded AMBERLITE XAD 7HP resin beads with a second selected temperature of 180 C. for the desorption process thereby producing a third eluate sample.

[0150] The data in Table 9 show that there were excellent adsorption ratios and desorption ratios for all four marker compounds from the complex green tea/elderberry PLP extract mixture i.e., caffeine, catechins, flavonols, and total phenolics onto and from the AMBERLITE XAD 7HP resin. Very high recoveries of total phenolics and caffeine were achieved at 130 C. and 180 C. Also the final concentration of caffeine at in the range of 90 C. to 130 C. was higher than the initial concentration, so it is possible to concentrate the above mentioned markers with the XAD 7HP adsorbent. The adsorbent can also be used for fractionation of extracts with a final fraction more concentrated in caffeine, and others more concentrated in catechins and flavonols.

[0151] The data in FIG. 6A show the recovery of caffeine, catechins, and total phenolics from AMBERLITE XAD 7HP resin with PLP water eluant at 90 C., 130 C., and 180 C. The data in FIG. 6B show the final concentration of caffeine, catechins, and total phenolics in eluates discharged from loaded AMBERLITE XAD 7HP resin with PLP water eluant at 90 C., 130 C., and 180 C.

TABLE-US-00010 TABLE 9 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from AMBERLITE XAD 7HP resin with PLP water eluant Adsorption Desorption Concentration Temp Marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (% w/w) XAD 7HP 90 Caffeine 93.58 30.47 28.51 5.1 12.46 0.19 130 94.28 76.94 72.54 5.13 13.39 0.01 180 93.68 90.31 84.6 5.15 8.84 0 XAD 7HP 90 Catechins 98.81 6.09 6.01 13.55 6.98 1.23 130 98.82 26.35 26.04 13.62 12.76 0.78 180 98.77 66.28 65.47 13.69 18.16 0.02 XAD 7HP 90 Flavonols 100 0 0 0.76 0 0.071 130 100 1.87 1.87 0.76 0.05 0.053 180 100 37.83 37.83 0.76 0.59 ND XAD 7HP 90 Total 95.97 15.04 14.44 47.14 58.3 3.4 130 Phenolics 96.13 45.77 43.99 47.37 75.01 2.09 180 95.99 84.48 81.09 47.63 78.27 0.26

5.5 PLP Water Desorption of Loaded SEPABEADS SP 70 Sorbent

[0152] Washed SEPABEADS SP 70 sorbent loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV. This process was repeated with a second stainless steel pressure-resistant column packed with fresh loaded SEPABEADS SP 70 sorbent with a second selected temperature of 130 C. for the desorption process thereby producing a second eluate sample. This process was repeated with a third stainless steel pressure-resistant column packed with fresh loaded SEPABEADS SP 70 sorbent with a second selected temperature of 180 C. for the desorption process thereby producing a third eluate sample.

[0153] The data in Table 10 show that there were excellent adsorption ratios for all four marker compounds from the complex green tea/elderberry PLP extract mixture i.e., caffeine, catechins, flavonols, and total phenolics onto the SEPABEADS SP 70 sorbent. Very high recoveries of caffeine and total phenolics were achieved at 180 C. However, the PLP water eluent did not desorb any catechins from the SEPABEADS SP 70 sorbent.

[0154] The data in FIG. 7A show the recovery of caffeine, catechins, and total phenolics from SEPABEADS SP 70 sorbent with PLP water eluant at 90 C., 130 C., and 180 C. The data in FIG. 7B show the final concentration of caffeine, catechins, and total phenolics in eluates discharged from loaded SEPABEADS SP 70 sorbent with PLP water eluant at 90 C., 130 C., and 180 C.

TABLE-US-00011 TABLE 10 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from SEPABEADS SP 70 sorbent with PLP water eluant Adsorption Desorption Concentration Temp Marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (% w/w) SP 70 90 Caffeine 99.56 6.57 6.54 5.1 3.8 0.42 130 99.67 24.69 24.6 5.1 5.3 0.26 180 99.56 82.25 81.89 5.0 9.9 0.03 SP 70 90 Catechins 98.77 10 9.87 12.74 14.39 0.89 130 98.76 42.39 41.86 12.74 22.73 0.31 180 98.69 47.45 46.83 12.69 14.28 0.02 SP 70 90 Flavonols 100 0 0 0.66 0 0.64 130 100 0 0 0.66 0 0.47 180 100 19.4 19.4 0.66 0.31 0.0 SP 70 90 Total 94.92 41.57 39.46 52.67 74.88 0.95 130 Phenolics 95.13 67.56 64.27 52.18 78.75 0.73 180 94.7 85.79 81.25 52.58 0.3

5.6 PLP Water Desorption of Loaded FLORISIL Sorbent

[0155] Washed FLORISIL sorbent loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV. This process was repeated with a second stainless steel pressure-resistant column packed with fresh loaded FLORISIL sorbent with a second selected temperature of 130 C. for the desorption process thereby producing a second eluate sample. This process was repeated with a third stainless steel pressure-resistant column packed with fresh loaded FLORISIL sorbent with a second selected temperature of 180 C. for the desorption process thereby producing a third eluate sample.

[0156] The data in Table 11 show that there were excellent adsorption ratios for all four marker compounds from the complex green tea/elderberry PLP extract mixture i.e., caffeine, catechins, flavonols, and total phenolics onto the FLORISIL sorbent. However, the recoveries of the four marker compounds from the FLORISIL sorbent were moderate at 130 C. and 180 C.

TABLE-US-00012 TABLE 11 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from FLORISIL sorbent with PLP water eluant Adsorption Desorption Concentration temp marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (% w/w) Florisil 90 Caffeine 98.83 9.74 9.63 5.34 1.59 0.18 130 99.01 27.91 27.63 5.42 3.51 0.1 180 98.9 72.16 71.37 5.38 7.74 0.01 Florisil 90 Catechins 98.23 5.6 5.5 17.31 2.94 0.02 130 98.59 4.43 4.37 17.56 1.8 0.01 180 98.85 3.48 3.44 17.44 1.21 0.01 Florisil 90 Flavonols 81.21 10.6 8.6 1.73 0.46 0 130 79.04 18.33 14.49 1.76 0.6 0 180 78.84 14.8 11.67 1.74 0.41 ND Florisil 90 Total 82.08 30.98 25.43 42.79 33.62 0.04 130 Phenolics 81.36 35.13 28.58 43.4 29.06 0.04 180 82.13 30.7 25.21 43.1 21.91 0.03

5.7 PLP Water Desorption of Loaded ZEOPREP C.18 Sorbent

[0157] Washed ZEOPREP C18 sorbent loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV. This process was repeated with a second stainless steel pressure-resistant column packed with fresh loaded ZEOPREP C18 sorbent with a second selected temperature of 130 C. for the desorption process thereby producing a second eluate sample.

[0158] The data in Table 12 show that there were excellent adsorption ratios for all four marker compounds from the complex green tea/elderberry PLP extract mixture i.e., caffeine, catechins, flavonols, and total phenolics onto the ZEOPREP C18 sorbent. Very good recoveries of caffeine and catechins were achieved at 90 C. and 130 C. The recoveries of flavonols and total phenolics from the ZEOPREP C18 sorbent were moderate at both temperatures.

[0159] The data in FIG. 8A show the recovery of caffeine, catechins, and total phenolics from ZEOPREP C18 sorbent with PLP water eluant at 90 C. and 130 C. The data in FIG. 8B show the final concentration of caffeine, catechins, and total phenolics in eluates discharged from loaded ZEOPREP C18 sorbent with PLP water eluant at 90 C. and 130 C.

TABLE-US-00013 TABLE 12 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from ZEOPREP C18 sorbent with PLP water eluant Adsorption Desorption Concentration Temp Marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (% w/w) Zeolite 90 Caffeine 94.23 66.79 62.94 5.03 15.51 0.00 C18 130 93.78 79.40 74.46 5.0 15.7 0.00 Zeolite 90 Catechins 88.74 83.97 74.52 12.66 46.19 0.08 C18 130 82.81 93.93 77.77 12.56 41.23 0.06 Zeolite 90 Flavonols 100 26.68 26.68 0.65 0.85 0.12 C18 130 100 38.54 38.54 0.65 1.05 0.07 Zeolite 90 Total 82.04 37.37 30.66 52.85 79.30 0.41 C18 130 Phenolics 80.92 40.64 32.89 53.48 74.23 0.40

5.8 PLP Water Desorption of Loaded Activated Carbon Sorbent

[0160] Washed activated carbon sorbent loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 90 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the selected time period. The total sample volume collected was 4 BV. This process was repeated with a second stainless steel pressure-resistant column packed with fresh loaded activated carbon sorbent with a second selected temperature of 130 C. for the desorption process thereby producing a second eluate sample.

[0161] The data in Table 13 show that there were excellent adsorption ratios for all four marker compounds from the complex green tea/elderberry PLP extract mixture i.e., caffeine, catechins, flavonols, and total phenolics onto the activated carbon sorbent. Very good recoveries of caffeine and catechins were achieved at 90 C. and 130 C. The recoveries of flavonols and total phenolics from the activated carbon sorbent were moderate at both temperatures.

TABLE-US-00014 TABLE 13 Adsorption and desorption of caffeine, catechins, flavonols, and total phenolics onto and from activated carbon sorbent with PLP water eluant Adsorption Desorption Concentration Temp Marker Ratio Ratio Recovery (% w/w) Residue ( C.) group (%) (%) (%) Initial Final (%) Activated 90 Caffeine 96.88 0.35 0.34 3.63 0.11 0.02 Carbon 130 97.14 0.50 0.49 3.63 0.1 0.00 180 97.01 0.89 0.87 3.63 0.12 0.01 Activated 90 Catechins 92.65 8.66 8.02 4.06 0.21 0.00 Carbon 130 92.45 7.46 6.9 4.06 0.19 0.00 180 92.55 7.18 6.65 4.06 0.22 0.00 Activated 90 Flavonols 51.04 0.0 0.0 0.35 0 0.00 Carbon 130 50.64 0.0 0.0 0.35 0 0.00 180 50.84 0.0 0.0 0.35 0 0.00 Activated 90 Total 43.29 39.40 17.06 39.87 47.27 Carbon 130 Phenolics 44.61 30.91 13.79 39.87 32.58 180 42.38 28.75 12.19 39.87 39.7

Example 6: Comparison of PLP-Water Desorption and Concentration of Caffeine from Selected Sorbents

[0162] The objective of this study was to compare the efficiencies of PLP water desorption of caffeine from bound to selected sorbents.

[0163] An extract comprising a mixture of phenolic compounds was solubilized and extracted from green tea leaf biomass using PLP water flowed through a PLP reaction vessel. Testing of the green tea PLP extract indicated that its total phenolic content was about 25 mg/mL.

[0164] The following sorbents were assessed in this study: [0165] AMBERLITE FPX-66 [0166] AMBERLITE XAD 7HP [0167] SEPABEADS SP 70 [0168] FLORISIL [0169] ZEOPREP C.18

[0170] Each sorbent was washed and loaded with the compounds from the green tea PLP extract, and then packed into a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends, as described in Example 5. Then, each column was pressurized and warmed to a selected temperature after which, caffeine was eluted from the loaded sorbent with PLP water eluent as described in Example 5. Each loaded sorbent was separately processed at 90 C., 130 C., and 180 C. as described in Example 5.

[0171] The recoveries of caffeine eluted from the different adsorbents by the PLP water eluent are shown in FIG. 9. The highest recoveries of caffeine occurred at 180 C. from the AMBERLITE FPX-66 (over 75%), AMBERLITE XAD 7HP (over 80%), SEPABEADS SP 70 (over 80%), and FLORISIL sorbents (over 70%). The recoveries of caffeine from the ZEOPREP C18 sorbent were over 60% at 90 C. and over 70% at 130 C. However, no caffeine was recovered from the ZEOPREP C18 sorbent at 180 C. The data in FIG. 10 show the initial concentration of caffeine in the PLP extract solution that was loaded onto the sorbents prior to elution with PLP water (the horizontal line extending across the three sets of bars, and the final concentrations of caffeine in the eluates collected from each sorbent during elution at 90 C., 130 C., and 180 C. Concentrations of caffeine higher than 12% were achieved at 90 C. and 130 C. from AMBERLITE XAD 7HP and from ZEOPREP C18 (FIG. 10). Concentration of caffeine was increased more than 2.5 and 3 times by adsorption to and desorption from the AMBERLITE XAD 7HP and from ZEOPREP C18 sorbents, in reference to the initial concentration of caffeine that was loaded onto these sorbents (FIG. 10).

[0172] Accordingly, the data produced in this example and in Example 5 demonstrate that it is possible to fractionate a green tea extract adsorbed onto AMBERLITE XAD 7HP sorbent, into a rich caffeine fraction (35%) desorbed at 90 C.-100 C. with a PLP water eluant, followed elution of a second fraction at about 160 C. having a higher catechins concentration as well as caffeine and flavonols. Similarly, these data indicate that it is possible to fractionate a green tea extract adsorbed onto AMBERLITE FPX-66 sorbent, into a rich caffeine fraction (35%) desorbed at 120 C.-130 C. with a PLP water eluant, followed elution of a second fraction at about 180 C. having a higher catechins concentration as well as caffeine and flavonols.

Example 7: Effects of Temperature on PLP-Water Desorption and Concentration of Caffeine from AMBERLITE XAD 7HP

[0173] Washed AMBERLITE XAD 7HP resin beads loaded with bound phenolic compounds from the complex green tea/elderberry PLP extract mixture prepared as disclosed in sections 5.1 and 5.2, were transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 75 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a first eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the 1 h time period. The total sample volume collected was 4 BV. The oven was then heated to the second selected temperature of 145 C. after which, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, a second eluate sample was collected commencing 5 min after the PLP water flow was started until completion of the 1 h time period. The total second sample volume collected was 4 BV.

[0174] The data in FIG. 11A show the recovery of caffeine, catechins, and flavonols from AMBERLITE XAD 7HP resin during the first extraction with PLP water eluant at 75 C., and during the second extraction with PLP water at 145 C. The data in FIG. 11B show the final concentration of caffeine, catechins, and flavonols in prior to loading onto the AMBERLITE XAD 7HP resin, from the first eluate discharged with PLP water at 75 C., and from the second eluate discharged with PLP water at 145 C. A caffeine concentration of about 2.5-3.5 times the initial concentration was reached with recoveries of the marker of 58 to 62% in the first 75 C. eluant fraction. In the second 145 C. eluant fraction, recoveries of 65-70% of catechins and 58-68% of flavonols were observed along with 2-3-fold increases of concentrations of both markers

Example 8: Effects of Temperature on PLP-Water Desorption and Concentration of Caffeine from Guarana Extract Loaded onto AMBERLITE XAD 7HP

[0175] An extract comprising a mixture of phenolic compounds was solubilized and extracted from guarana whole beans using PLP water flowed through a PLP reaction vessel as disclosed in Example 5 sections 5.1 and 5.2. Testing of the green tea PLP extract indicated that its total phenolic content was about 19.9% (w/w).

[0176] The guarana extract was loaded onto washed AMBERLITE XAD 7HP resin beads in a 1-inch as disclosed in Example 5 section 5.4, for about 2 h. The loaded resin beads were then transferred into and packed within a stainless steel pressure-resistant column (20 cm long2.2 cm ID) with frits in both ends. The desorption process was started by setting the packed column into the PLPW system described in Example 1. Water was then pumped through the column at a 4 BV/h flow rate to bring the pressure up to about 200 psi. After the selected pressure was reached, the pump was turned off and the oven warmed up to a first selected temperature of 80 C. for the desorption process. After the selected temperature was reached, the column was statically warmed for 15 min after which, the pump was restarted and desorption commenced at a PLP water flow rate of 4 BV/h for a selected period of 1 h during which time, five 150-mL eluate samples were sequentially collected commencing 5 min after the PLP water flow was started until completion of the 1 h time period (total of 750 mL). Then, the temperature was increased to the second selected temperature of 180 and the column was statically warmed for 15 min after which, three 150-mL samples were collected (total of 450 mL).

[0177] The caffeine concentrations in the guarana extract were determined with HPLC analyses following the procedure disclosed in above Example 5 section 5.3. The caffeine concentration in the guarana extract was 19.9% (w/w) prior to loading onto the AMBERLITE XAD 7HP resin beads. The total recovery of caffeine from guarana extract from AMBERLITE XAD 7HP in the 80 C. was about 70% (FIG. 12B). Only 3.25% of caffeine was recovered in the 140 C. fraction, indicating that almost all the recovered caffeine was collected in the 80 C. fractions (FIG. 12A). The total caffeine concentration in the five PLPW eluants collected at 80 C. was about 70%. At the high temperature only 3.25% of caffeine was obtained in the 140 C. fraction, indicating that almost all the recovered caffeine was collected in the 80 C. fractions (FIG. 12A). Furthermore, the data in FIG. 12B indicate that caffeine was concentrated up to approximately 36% in the combined 80 C. eluant fractions (FIG. 12B). The concentration of caffeine in the three eluant fractions collected at 140 C. was 4.3% (w/w) (FIG. 12B).