Patent ID: 9125857
Filing Date: 2015-09-08
Classification: A61K,A61P

Abstract:
1. A process for producing a hydroxystilbene-containing drug extract, comprising: a) providing a hydroxystilbene-containing part of a plant of the genus b) adding an aqueous extractant to the hydroxystilbene-containing part of the plant to form a mixture, wherein said aqueous extractant is substantially free of organic solvents, c) extracting in a single step the mixture at a pH in the alkaline range and at a temperature range between 10 to 35 ° C. at atmospheric pressure, thereby obtaining a liquid extract phase from the mixture, and d) obtaining a hydroxystilbene-containing drug extract through precipitation, wherein said precipitation is performed by adjusting the pH of the liquid extract phase to a value between 3 to 4, thereby producing a hydroxystilbene-containing drug extract having a total content of rhaponticin and deoxyrhaponticin of more than 90% by weight and having 0 to 0.05% by weight of piceatannol and 0 to 0.3% by weight of anthraquinoids.