Compositions containing thymohydroquinone and their method of preparation

Abstract

Disclosed are compositions enriched with thymohydroquinone, further comprising of thymoquinone, hederagenin and/or -hederin formulated by blending the active molecules isolated from the seeds of Nigella sativa. Also disclosed are novel processes for the isolation of bioactive components thymohydroquinone, thymoquinone from the seeds of Nigella sativa. A process for the isolation -hederin and hederagenin from the spent material of Nigella sativa is also disclosed herein.

Claims

1. A composition comprising thymohydroquinone as represented by STR#1 isolated from the seeds of Nigella sativa, wherein said composition is standardised to contain 2%-5% w/w thymoquinone, 0.01%-10% w/w thymohydroquinone, 20%-95% w/w fatty acids, 0.001%-3% w/w -hederin, 0.1%-4.0% w/w rosmarinic acid and 0.2%-2% w/w piperine.

2. The composition as in claim 1, wherein the composition is prepared using a process comprising steps of: o) Powdering the seeds of Nigella sativa, pulverizing using 1.5 mm mesh and passing through magnetic separator to obtain a coarse powder; p) Subjecting the powder of step a) to super critical fluid extraction (SCFE) using liquid CO2 to obtain three fractions: low volatile compoundsS1 fraction, high volatile compoundsS2 fraction and spent residue; q) Identifying the compounds in low volatile and high volatile fractions as thymoquinone as represented by STR#2, thymohydroquinone as represented by STR#1 and free fatty acids using Gas Chromatography with total yield of about 10-40% in S1 fraction and about 1-6% in S2 fraction respectively; r) Extracting the spent residue of step b) with 5 volumes of ethanol at 6065 C. with stirring for 3 hours; s) Filtering the concentrating the ethanol extract of step d) to obtain a brownish paste; t) Dissolving the brownish paste of step e) in water and partitioning thrice with 3 volumes of hexane to obtain aqueous and hexane fractions; u) Partitioning the aqueous fraction of step f) thrice with n-butanol; v) Quenching the n-butanol fraction of step g) with water to strip off the solvent while maintaining 20-30% of total dissolved solids; w) Spray drying to obtain pale brownish powder identified as -hederin (CAS no. 27013-91-8) represented by STR#3 by HPLC with yield of 0.001-5% on a dry basis; x) Blending the S2 fraction of step c) with -hederin of step i) to obtain a mixture comprising thymohydroquinone, thymoquinone, -hederin and free fatty acids; y) Dissolving the mixture of step j) with ethanol in a reactor with stirring at 65-70 C. for 30 minutes to obtain a homogenous mixture; z) Stripping off the ethanol from mixture of step k) under vacuum and filtering to remove insolubles to obtain a brownish yellow oily liquid; aa) Adding stabilizing agents (rosmarinic acid) and bioavailability enhancerspieprine to the mixture of step l) bb) Formulating the mixture of step m) into tablets, capsules, soft gels, powder, pills, syrups, lozenges, suspension, emulsions. ##STR00002##

3. The composition as in claim 1, wherein the free fatty acids in the compositions comprises of less than 0.5% w/w 3 (omega 3) fatty acids, 40%-70% w/w 6 (omega 6) fatty acids and 15%-25% w/w 9 (omega 9) fatty acids.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a flow chart describing the process for isolating thymoquinone (TQ) and thymohydroquinone (THQ).

(2) FIG. 2 is a flow chart describing the process for isolating Hederagenin and -hederin.

(3) FIG. 3 is a flow chart describing the process for blending a formulation containing thymoquinone, thymohydroquinone, -hederin or hederagenin.

(4) FIG. 4 is a flow chart describing the process of isolation of bioactives from Nigella sativa.

DESCRIPTION OF PREFERRED EMBODIMENTS

(5) In a most preferred embodiment, the present invention discloses a composition comprising thymohydroquinone as represented by STR#1 isolated from the seeds of Nigella sativa, wherein said composition is prepared using a process comprising steps of: a) Powdering the seeds of Nigella sativa, pulverizing using 1.5 mm mesh and passing through magnetic separator to obtain a coarse powder; b) Subjecting the powder of step a) to super critical fluid extraction (SCFE) using liquid CO2 to obtain three fractions: low volatile compoundsS1 fraction, high volatile compoundsS2 fraction and spent residue; c) Identifying the compounds in low volatile and high volatile fractions as thymoquinone as represented by STR#2, thymohydroquinone as represented by STR#1 and free fatty acids using Gas Chromatography with total yield of about 10-40% in S1 fraction and about 1-6% in S2 fraction respectively; d) Extracting the spent residue of step b) with 5 volumes of ethanol at 6065 C. with stirring for 3 hours; e) Filtering the concentrating the ethanol extract of step d) to obtain a brownish paste; f) Dissolving the brownish paste of step e) in water and partitioning thrice with 3 volumes of hexane to obtain aqueous and hexane fractions; g) Partitioning the aqueous fraction of step f) thrice with n-butanol; h) Quenching the n-butanol fraction of step g) with water to strip off the solvent while maintaining 20-30% of total dissolved solids; i) Spray drying to obtain pale brownish powder identified as -hederin (CAS no. 27013-91-8) represented by STR#3 by HPLC with yield of 0.001-5% on a dry basis; j) Blending the S2 fraction of step c) with -hederin of step i) to obtain a mixture comprising thymohydroquinone, thymoquinone, -hederin and free fatty acids; k) Dissolving the mixture of step j) with ethanol in a reactor with stirring at 6570 C. for 30 minutes to obtain a homogenous mixture; l) Stripping off the ethanol from mixture of step k) under vacuum and filtering to remove insolubles to obtain a brownish yellow oily liquid; m) Adding stabilizing agents and bioavailability enhances to the mixture of step l) n) Formulating the mixture of step m) into tablets, capsules, soft gels, powder, pills, syrups, lozenges, suspension, emulsions.

(6) ##STR00001##

(7) In a related embodiment, the composition is standardised to contain about 0.1%-5% w/w thymoquinone, about 0.01%-10% w/w thymohydroquinone, about 20%-95% w/w fatty acids, about 0.001%-3% w/w -hederin, 0.1%-4.0% w/w stabilizing agent and 0.2%-2% w/w bioavailability enhancer. In another related embodiment, the free fatty acids in the compositions comprises of than 0.5% w/w 3 (omega 3) fatty acids, 40%-70% w/w 6 (omega 6) fatty acids and 15%-25% w/w 9 (omega 9) fatty acids. In another related embodiment, the stabilizing agent is selected from the group consisting of rosmarinic acid, butylated hydroxyanisole, butylated hydroxytoluene, sodium metabisulfite, propyl gallate, cysteine, ascorbic acid and tocopherols. In a related embodiment, the stabilizing agent is preferably rosmarinic acid. In yet another related embodiment the bioavailability enhancer is selected from the group of piperine, quercetin, garlic extract, ginger extract, and naringin. In a related embodiment, the bioavailability enhancer is preferably piperine.

(8) In another preferred embodiment, the present invention discloses a composition comprising thymohydroquinone as represented by STR#1 isolated from the seeds of Nigella sativa, wherein said composition is prepared using a process comprising steps of: a) Powdering the seeds of Nigella sativa, pulverizing using 1.5 mm mesh and passing through magnetic separator to obtain a coarse powder; b) Subjecting the powder of step a) to super critical fluid extraction (SCFE) using liquid CO2 to obtain three fractions: low volatile compoundsS1 fraction, high volatile compoundsS2 fraction and spent residue; c) Identifying the compounds in S1 fraction and S2 fraction as thymoquinone as represented by STR#2, thymohydroquinone as represented by STR#1 and free fatty acids using Gas Chromatography with total yield of about 10-40% in S1 fraction and about 1-6% in S2 fraction respectively; d) Extracting the spent residue of step b) with 5 volumes of ethanol at 60-65 C. with stirring for 3 hours; e) Filtering the concentrating the ethanol extract of step d) to obtain a brownish paste; f) Dissolving the brownish paste of step e) in water and partitioning thrice with 3 volumes of hexane to obtain aqueous and hexane fractions; g) Partitioning the aqueous fraction of step f) thrice with n-butanol; h) Quenching the n-butanol fraction of step g) with Water to strip off the solvent while maintaining 20-30% of total dissolved solids; i) Spray drying to obtain pale brownish powder identified as -hederin represented by STR#3 by HPLC with yield of 0.001-5% on a dry basis; j) Subjecting the powder of step i) to mild hydrolysis by dissolving in 2 volumes of ethanol, 1.4 volumes of 2N HCl and heating the mixture at 50-60 C. with stirring for 5-6 hours; k) Striping off the Ethanol fraction from Reaction mass to obtain Ethyl acetate fraction; l) Washing the ethyl acetate fraction with 2% Na2CO3 solution to neutralise the pH; m) Separating the ethyl acetate fraction and concentrating to obtain a pale brown powder identified by HPLC as hederagenin represented by STR#4 with assay 40-70%; n) Blending the S2 fraction of step c) with hederagenin of step m) to obtain a mixture comprising thymohydroquinone, thymoquinone, hederagenin and free fatty acids; o) Dissolving the mixture of step n) with ethanol in a reactor with stirring at 65-70 C. for 30 minutes to obtain a homogenous mixture; p) Stripping off the ethanol from mixture of step o) under vacuum and filtering to remove insolubles to obtain a brownish yellow oily liquid; q) Adding stabilizing agents and bioavailability enhances to the mixture of step p) r) Formulating the mixture of step q) into tablets, capsules, soft gels, powder, pills, syrups, lozenges, suspension, emulsions.

(9) In a related embodiment, the composition is standardised to contain about 0.1%-5% w/w thymoquinone, about 0.01%-10% w/w thymohydroquinone, about 20%-95% w/w fatty acids, about 0.001%-3% w/w hederagenin, 0.1%-4.0% w/w stabilizing agent and 0.2%-2% w/w bioavailability enhancer. In another related embodiment, the free fatty acids in the compositions comprises of less than 0.5% w/w 3 (omega 3) fatty acids, 40%-70% w/w 6 (omega 6) fatty acids and 15%-25% w/w 9 (omega 9) fatty acids. In another related embodiment, the stabilizing agent is selected from the group consisting of rosmarinic acid, butylated hydroxyanisole, butylated hydroxytoluene, sodium metabisulfite, propyl gallate, cysteine, ascorbic acid and tocopherols. In a related embodiment, the stabilizing agent is preferably rosmarinic acid. In yet another related embodiment the bioavailability enhancer is selected from the group of piperine, quercetin, garlic extract, ginger extract, and naringin. In a related embodiment, the bioavailability enhancer is preferably piperine.

(10) In yet another preferred embodiment, the present invention discloses a composition comprising thymohydroquinone as represented by STR#1 isolated from the seeds of Nigella sativa, wherein said composition is prepared using a process comprising steps of: a) Powdering the seeds of Nigella sativa, pulverizing using 1.5 mm mesh and passing through magnetic separator to obtain a coarse powder; b) Subjecting the powder of step a) to super critical fluid extraction (SCFE) using liquid CO2 to obtain three fractions: low volatile compoundsS1 fraction, high volatile compoundsS2 fraction and spent residue; c) Identifying the compounds in low volatile and high volatile fractions as thymoquinone as represented by STR#2, thymohydroquinone as represented by STR#1 and free fatty acids using Gas Chromatography with total yield of about 10-40% in S1 fraction and about 1-6% in S2 fraction respectively; d) Extracting the powder of step a) with ethanol to obtain ethanol extract and spent material e) Drying the spent material of step d) under over at 60 C.-70 C., pulverizing and shifting with 40# mesh to obtain a deoiled powder of Nigella sativa; f) Blending 2%-5% of S2 fraction obtained from step b) with 30%-40% of ethanol extract of step d) and 50%-70% of deoiled powder from step e) to obtain a composition comprising thymohydroquinone, thymoquinone and free fatty acids; g) Mixing the composition of step f) with 0.001%-1% of hederagenin, as represented by STR#4, obtained from step m) and/or 0.001%-1% of -hederin, as represented by STR#3, obtained from step i) of the process mentioned in the second embodiment to obtain a composition comprising thymohydroquinone, thymoquinone, free fatty acids, -hederin and/or hederagenin; h) Adding stabilizing agents and bioavailability enhances to the composition of step g) i) Formulating the mixture of step h) into tablets, capsules, soft gels, powder, pills, syrups, lozenges, suspension, emulsions.

(11) In a related embodiment, the composition is standardised to contain about 0.1%-5% w/w thymoquinone, about 0.01%-10% w/w thymohydroquinone, about 20%-95% w/w fatty acids, about 0.001%-3% w/w -hederin and/or hederagenin, 0.1%-4.0% w/w stabilizing agent and 0.2%-2% w/w bioavailability enhancer. In another related embodiment, the free fatty acids in the compositions comprises of than 0.5% w/w 3 (omega 3) fatty acids, 40%-70% w/w 6 (omega 6) fatty acids and 15%-25% w/w 9 (omega 9) fatty acids. In another related embodiment, the stabilizing agent is selected from the group consisting rosmarinic acid, butylated hydroxyanisole, butylated hydroxytoluene, sodium metabisulfite, propyl gallate, cysteine, ascorbic acid and tocopherols. In a related embodiment, the stabilizing agent is preferably rosmarinic acid. In yet another related embodiment the bioavailability enhancer is selected from the group of piperine, quercetin, garlic extract, ginger extract, and naringin. In a related embodiment, the bioavailability enhancer is preferably piperine.

(12) The aforesaid most preferred embodiments incorporating the technical features and technical effects of instant invention, are explained through illustrative examples herein under.

Example 1: Process for Isolating the Active Molecules from Nigella sativa by SCFE Extraction and Preparing a Formulation

(13) The present invention relates to compositions comprising thymohydroquinone and other bioactives isolated from the seeds of Nigella sativa. Flow chart No. 1 (FIG. 1) provides a process for the isolation of thymoquinone (TQ) and thymohydroquinone from the seeds of Nigella sativa:

(14) The process shown in FIG. 1, results in two fractions containing TQ, THQ and free fatty acids with high total yields of 30% and 3-4% respectively. The content of TQ, THQ is proportionately high in the S2 fraction.

(15) The spent material from the above process was processed to obtain further components like hederagenin and -hederin. Flow Chart No. 2 (FIG. 2) provides the process for the isolation of hederagenin and -hederin.

(16) Flow chart as shown in FIG. 3, describes the process for blending a formulation containing thymoquinone, thymohydroquinone, -hederin or hederagenin.

Example 2: Process for Isolating the Active Molecules from Nigella sativa by Ethanol Extraction and Preparing a Formulation

(17) In an alternate process, the seed of Nigella sativa was subjected to ethanol extraction and the composition was formulated with the bioactives isolated from both SCFE and ethanol extraction. Flow chart No. 4 (FIG. 4) describes the process of isolation of bioactives from Nigella sativa.

(18) A composition containing thymoquinone, thymohydroquinone, -hederin or hederagenin and free fatty acids was blended from the actives isolated from the above process as described in Table 1.

(19) TABLE-US-00001 TABLE 1 Formulation details Name of the material for Name of Percent S. No blending the Label Composition (%) 1 Black cumin seed SCF A 2-5 extract (S2 Fraction) 2 Black cumin seed ethanol B 30-40 extract 3 Deoiled powder C 50-70 4 Hederagenin or -hederin 0.001-1

Example 3: Compositions Containing Thymohydroquinone

(20) From the processes described herein above, the following compositions containing thymoquinone, thymohydroquinone, Hederagenin or -hederin and free fatty acids were formulated. Table 2 describes the different compositions and the concentrations of the individual actives. The compositions further contain stabilizing agents (Rosmarinic acid) and bioavailability enhancers (Piperine).

(21) TABLE-US-00002 TABLE 2 Compositions containing thymohydroquinone Hederagenin or TQ THQ -hederin Fatty acids (%) (%) (%) (%) Composition 1 0.1-5.0 0.01-10 0.001-1 >85% Composition 2 0.1-5.0 0.01-10 0.001-1 >20% (White excipient) Composition 3 0.1-5.0 0.01-10 0.001-1 >20% (Ethanol extraction- Black excipient)

(22) The total fatty acids in the composition were further characterized using Gas chromatography and were observed to be rich in 3, 6, 9. The results are tabulated in table 3:

(23) TABLE-US-00003 TABLE 3 Fatty acids in the compositions containing thymohydroquinone Name of the Composition 1 Composition 2 Composition 3 Fatty acid (%) (%) (%) Omega 3 .sup.0-0.2 0.2 0.0 Omega 6 50-66 55 44 Omega 9 16-23 22 18

(24) It is well known in the scientific art that thymoquinone and thymohydroquinone are the two main components of black seed essential oil. Although thymohydroquinone is the reduced form of thymoquinone, the chemistry and biological potential of the molecules differ from each other. Studies on the antioxidant and anti-inflammatory potential of the actives indicated that thymohydroquinone is a more potent antioxidant and anti-inflammatory molecule than thymoquinone. Most of the processes that are employed to isolate the bioactive from black seed are enriched with only thymoquinone. The present invention reports a novel process that results in a composition with increased thymohydroquinone content.

(25) Accelerated stability study indicated that there is gradual increase in thymohydroquinone quantity with decrease in content of thymoquinone.

(26) TABLE-US-00004 TABLE 4 Accelerated stability study Percentage Percentage TQ content Difference in difference THQ content Difference in difference Period of study by GC (%) TQ content in TQ by GC (%) THQ content (%) in THQ Initial 0.733 0 0 0.033 0 0 (0 month) 1st month 0.717 0.016 2.18 0.037 0.004 +12.12 2nd month 0.706 0.027 3.68 0.041 0.008 +24.24 3rd month 0.622 0.111 15.14 0.092 0.059 +178.78 6th month 0.548 0.185 25.23 0.120 0.087 +263.63

(27) Accelerated stability study shows a gradual increase in thymohydroquinone quantity with decrease in content of thymoquinone.

(28) TABLE-US-00005 TABLE 5 Long term stability study Percentage Percentage TQ content Difference in difference THQ content Difference in difference Period of study by GC (%) TQ content in TQ by GC (%) THQ content in THQ Initial 0.733 0 0 0.033 0 0 (0 Month) 3rd month 0.643 0.09 12.27 0.095 0.062 +187.88 6th month 0.634 0.099 13.50 0.138 0.105 +318.18

(29) Thus, the compositions enriched with thymohydroquinone can exhibit improved therapeutic potential and can be administered for the management of many diseases and disorders.

(30) Other modifications and variations to the invention will be apparent to those skilled in the art from the foregoing disclosure and teachings. Thus, while only certain embodiments of the invention have been specifically described herein, it will be apparent that numerous modifications may be made thereto without departing from the spirit and scope of the invention.