Caffeine-adsorbing materials, caffeine-adsorbing systems, and decaffeination system suitable for removing caffeine from a solution; methods for removing caffeine from a solution; and methods of making the caffeine-adsorbing materials are described.

Provided is a green tea extract composition, including the following components (A), (B), (C), (D), and (E): (A) non-polymer catechins; (B) a sugar; (C) iron; (D) caffeine; and (E) gallic acid, in which a content of the non-polymer catechins (A) is from 25 mass % to 45 mass %; a content of the sugar (B) is from 4 mass % to 13 mass %; a mass ratio between the sugar (B) and the caffeine (D), [(D)/(B)], is from 0.2 to 0.8; a mass ratio between the gallic acid (E) and the iron (C), [(E)/(C)], is from 55 to 2,500; and (F) a water content is 10 mass % or less.

The invention relates to a caffeine-templated MIP copolymer matrix and devices employing these polymers that exhibit high absorbance or binding capacity for caffeine while retaining rapid caffeine uptake kinetics, and which function in both cold and hot aqueous environments to selectively remove caffeine from a beverage with a high selectivity factor in order to better preserve the sensory aspects of the decaffeinated beverage, and which can easily be used by a typical consumer to treat their beverage within a short time frame of less than about one minute. More specifically, the invention relates to copolymeric MIP matrices produced according to methods wherein the template to polymer ratio is dramatically increased in order to raise the affinity of the resulting MIP materials, and hyper-crosslinked MIP matrices produced using higher amounts of crosslinking agents to produce high affinity copolymer matrices that better maintain a high degree of selectivity towards caffeine while minimizing the uptake of congeners to better maintain the sensory characteristics of the decaffeinated beverages. The invention further relates to manual and mechanical devices employing the inventive MIP matrices in a variety of physical forms and configurations that enable a user to decaffeinate a beverage manually or automatically within one minute or less, or select a level of decaffeination by controlling the exposure time to said devices.

Provided is a green tea extract composition, comprising the following components (A), (B), (C), and (D): (A) non-polymer catechins; (B) a sugar; (C) iron; and (D) caffeine, the green tea extract composition having: a content of the non-polymer catechins (A) of from 25 to 45 mass %; a content of the sugar (B) of from 6 to 13 mass %; a mass ratio between the sugar (B) and the iron (C), [(C)/(B)], of from 0.000005 to 0.00016; a mass ratio between the sugar (B) and the caffeine (D), [(D)/(B)], of from 0.2 to 0.7; and a water content of 10 mass % or less.

Provided is a green tea extract composition, comprising the following components (A), (B), (C), and (D): (A) non-polymer catechins; (B) a sugar; (C) iron; and (D) caffeine, the green tea extract composition having: a content of the non-polymer catechins (A) of from 25 to 45 mass %; a content of the sugar (B) of from 6 to 13 mass %; a mass ratio between the sugar (B) and the iron (C), [(C)/(B)], of from 0.000005 to 0.00016; a mass ratio between the sugar (B) and the caffeine (D), [(D)/(B)], of from 0.2 to 0.7; and a water content of 10 mass % or less.

Disclosed is a water based method for extracting caffeine from alkaloid containing substances, in particular tea leaves. The method can be performed without the use of artificial substances. The method allows the other soluble, non-caffeine components of alkaloid containing substances to be part of the decaffeinated product, in particular, components such as catechins and antioxidants. Advantageously, the caffeine extracted from the alkaloid containing substances is reversibly adsorbed to an adsorbent and high percentile of the caffeine can be recovered from the adsorbent.

Methods for modulating the bitterness and astringency of green tea, and nutritional products having a green tea with reduced bitterness and astringency, are provided. In a general embodiment, the methods comprise performing microfiltration on green tea extract to form a microfiltration retentate and a microfiltration permeate; performing at least one of ultrafiltration or reduced temperature fractionation on the microfiltration permeate; and using the ultrafiltration permeate from the ultrafiltration or the supernatant from the reduced temperature fractionation to make a green tea product. The ultrafiltration permeate or the supernatant can be further concentrated, spray or freeze dried to form a powder, used as a concentrate, or diluted to form a ready-to-drink beverage. In an embodiment, the ultrafiltration is performed on the microfiltration permeate to form an ultrafiltration retentate and an ultrafiltration permeate and then the reduced temperature fractionation is performed on the ultrafiltration permeate to form a supernatant and a sediment.

Methods for modulating the bitterness and astringency of green tea, and nutritional products having a green tea with reduced bitterness and astringency, are provided. In a general embodiment, the methods comprise performing microfiltration on green tea extract to form a microfiltration retentate and a microfiltration permeate; performing at least one of ultrafiltration or reduced temperature fractionation on the microfiltration permeate; and using the ultrafiltration permeate from the ultrafiltration or the supernatant from the reduced temperature fractionation to make a green tea product. The ultrafiltration permeate or the supernatant can be further concentrated, spray or freeze dried to form a powder, used as a concentrate, or diluted to form a ready-to-drink beverage. In an embodiment, the ultrafiltration is performed on the microfiltration permeate to form an ultrafiltration retentate and an ultrafiltration permeate and then the reduced temperature fractionation is performed on the ultrafiltration permeate to form a supernatant and a sediment.