Patents Assigned to Chengdu Wagott Pharmaceutical Co., Ltd.
  • Patent number: 7923541
    Abstract: A process for recovering Rebaudioside A from Stevia rebaudiana Bertoni plants is provided and includes the steps of sequentially extracting plant material with a first solvent to obtain a first extract, filtering the first extract and passing the first extract through a polar resin to obtain a filtrate, and purifying the filtrate to obtain a crystalline-containing material. With further purification, a product containing over 99% Rebaudioside A is obtained. The present invention is also directed toward a method of purifying stevia glycosides to obtain purified Rebaudioside A. In one embodiment, the method includes silica gel column chromatography using an solvent comprising ethyl acetate and ethanol.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: April 12, 2011
    Assignee: Chengdu Wagott Pharmaceutical Co., Ltd.
    Inventors: Mingfu Yang, Jun Hua, Ling Qin