Patent ID: 8791253
Filing Date: 2014-07-29
Classification: A23L,A23V,C07H

Abstract:
1. A method for purifying polymorphic and/or amorphous forms of rebaudioside A comprising the steps of: combining a crude rebaudioside A mixture containing an extract from wherein the crude rebaudioside A mixture contains rebaudioside A in a purity from about 60% to about 85%, the aqueous organic solvent and the crude rebaudioside A mixture are present in the rebaudioside A solution in a weight ratio from about 4 to about 10 parts aqueous organic solvent to about 1 part crude rebaudioside A, and the aqueous organic solvent contains water in an amount from about 10% to about 25% by weight, and a mixture of ethanol and methanol; heating the rebaudioside A solution at a temperature in a range from room temperature to about 40° C.; crystallizing the rebaudioside A solution in a single crystallization step to provide a substantially pure rebaudioside A composition; and separating and washing the substantially pure rebaudioside A composition to provide rebaudioside A in a purity greater than 95% by weight on a dry basis.