Method of extracting selected sweet glycosides from the Stevia rebaudiana plant
First Claim
1. A method of extracting Rebaudioside A from a mixture of Rebaudioside A and Stevioside obtained from the Stevia rebaudiana plant comprising the steps of:
- a) treating the Stevia rebaudiana plant to extract an aqueous liquid solution containing mixed sweet glycosides and non-sweet glycosides;
b) separating the non-sweet glycosides from the mixed sweet glycosides and drying the mixed sweet glycosides;
c) dissolving the mixed sweet glycosides obtained in step (b) with solvent selected from the group consisting of methanol or methanol-water solution to form a solution, refluxing the solution and then cooling the solution to precipitate Stevioside;
d) filtering the solution to recover the precipitate Stevioside and a filtrate containing other sweet glycosides;
e) concentrating the filtrate from step (d) by heating and then cooling the solution to precipitate Rebaudioside A;
f) dissolving the precipitate Rebaudioside A in a solvent selected from the group consisting of methanol or methanol-water solution to form a solution, refluxing the solution and then cooling the solution to precipitate the Rebaudioside A at a higher purity; and
g) recovering the higher purity Rebaudioside A.
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Abstract
Individual sweet glycosides are obtained from the stevia rebaudiana plant. A mixture of sweet glycosides extracted from the stevia rebaudiana plant are processed to remove impurities by using two ion exchange columns. After removing the mixed sweet glycosides from the second column with methanol the solution is dried. Upon refluxing the dried solids in a methanol solution and then cooling the solution, Stevioside precipitates out. The filtrate is further concentrated and cooled to precipitate out Rebaudioside A. This Rebaudioside A can be further purified as can the previously obtained Stevioside.
187 Citations
5 Claims
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1. A method of extracting Rebaudioside A from a mixture of Rebaudioside A and Stevioside obtained from the Stevia rebaudiana plant comprising the steps of:
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a) treating the Stevia rebaudiana plant to extract an aqueous liquid solution containing mixed sweet glycosides and non-sweet glycosides; b) separating the non-sweet glycosides from the mixed sweet glycosides and drying the mixed sweet glycosides; c) dissolving the mixed sweet glycosides obtained in step (b) with solvent selected from the group consisting of methanol or methanol-water solution to form a solution, refluxing the solution and then cooling the solution to precipitate Stevioside; d) filtering the solution to recover the precipitate Stevioside and a filtrate containing other sweet glycosides; e) concentrating the filtrate from step (d) by heating and then cooling the solution to precipitate Rebaudioside A; f) dissolving the precipitate Rebaudioside A in a solvent selected from the group consisting of methanol or methanol-water solution to form a solution, refluxing the solution and then cooling the solution to precipitate the Rebaudioside A at a higher purity; and g) recovering the higher purity Rebaudioside A. - View Dependent Claims (2, 3, 4, 5)
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Specification