Process for extracting compounds from plants
First Claim
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1. A method for selectively extracting one or more non-acidic compounds from plant tissue in the presence of one or more acidic compounds, the method comprising:
- (a) contacting a mixture of a basic component and a first solvent with the plant tissue to immobilize the acidic compound as a salt on the plant tissue; and
(b) contacting the plant tissue with a second solvent suitable to remove the one or more non-acidic compounds;
thereby effectively providing a solution comprising the one or more non-acidic compounds.
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Abstract
The present invention provides a method for selectively extracting acidic and/or non-acidic compounds from natural material such as plant tissue.
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Citations
38 Claims
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1. A method for selectively extracting one or more non-acidic compounds from plant tissue in the presence of one or more acidic compounds, the method comprising:
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(a) contacting a mixture of a basic component and a first solvent with the plant tissue to immobilize the acidic compound as a salt on the plant tissue; and
(b) contacting the plant tissue with a second solvent suitable to remove the one or more non-acidic compounds;
thereby effectively providing a solution comprising the one or more non-acidic compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 36)
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31. A method for selectively extracting one or more non-acidic compounds from plant tissue in the presence of one or more acidic compounds, the method comprising:
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(a) contacting the plant tissue with an aluminum alkoxide in a first solvent to immobilize the acidic compound as a salt on the plant tissue; and
(b) contacting the plant tissue with a second solvent suitable to remove the one or more non-acidic compounds;
thereby effectively providing a solution comprising the one or more non-acidic compounds;
wherein the one or more non-acidic compounds comprises lupeol, betulin, taxol, paclitaxel, echinacea extract, valerian root extract, ginkgolide A, ginkgolide B, ginkgolide C, bilobalide, garlic extract, ginseng extract, aloe gel, barbaloin, cranberry extract, eleutheroside A, eleutheroside B, eleutheroside C, eleutheroside D, eleutheroside E, eleutheroside G, kava extract, dill seed oil, kola extract, quinoline alkoloids, or a combination thereof; and
wherein the one or more acidic compounds comprises betulin acid, betulin-3-caffeate, tannin, phenol, caffeic acid, cichoric acid, valerenic acid, isovaleric acid, flavonoid, quercetin, kaempferol, catechin, lignin, shikimic acid, succinic acid, an amino acid, nicotinic acid, pantothenic acid, anthraquinone, acidic galactan, benzoic acid, quinic acid, malic acid, citric acid, hippuric acid, phenolic acid, ferulic acid, chlorogenic acid, norsolorinic acid, a fatty acid, tartaric acid, dicaffeate, cinnamic acid, or a combination thereof. - View Dependent Claims (32)
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33. A method for selectively extracting lupeol, betulin, or a combination thereof from birch bark in the presence of betulinic acid, betulin-3-caffeate, or a combination thereof, the method comprising:
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(a) contacting the birch bark with an aluminum alkoxide in a first solvent comprising xylene thereby effectively immobilizing the betulinic acid, betulin-3-caffeate, or combination thereof as a salt on the birch bark; and
(b) contacting the birch bark with a second solvent suitable to remove the lupeol, betulin, or combination thereof. - View Dependent Claims (34)
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37. Taxol obtained by the process of contacting a mixture of a basic component and a first solvent with Taxus yunnanesis bark to immobilize one or more acidic compounds on the Taxus yunnanesis bark and contacting the Taxus yunnanesis bark with a second solvent suitable to remove the taxol, to effectively provide a solution comprising taxol comprising less than about 5 wt. % of tannins, fatty acids, phenols, or a combination thereof.
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38. Betulin obtained by the process of contacting a mixture of a basic component and a first solvent with birch bark to immobilize one or more acidic compounds on the birch bark and contacting the birch bark with a second solvent suitable to remove the betulin, to provide a solution comprising betulin comprising less than about 5 wt. % of betulinic acid, betulin-3-caffeate, or a combination thereof.
Specification