Applicant: Shanghai Tongji Biological Products Co., Ltd.
Application date: April 9, 2007-main classification number: A6 1K9/ 19.
The invention relates to a preparation process of refined ginkgo biloba freeze-dried powder, which is characterized in that supercritical CO2 extraction technology is adopted to replace the traditional ethanol extraction, and ginkgolic acid, a harmful component in ginkgo biloba leaves, can be effectively removed; Low temperature extraction at 35 ~ 40℃ is easier to retain the characteristics of bioactive components in Ginkgo biloba leaves than high temperature extraction at 65 ~ 75℃, and the product has stronger efficacy. The vacuum freeze-drying process at -40℃ was used to replace the traditional spray-drying process at 150℃, so that the biological activity loss of the product was close to zero during drying. Compared with traditional products, the bio-film method and chromatographic separation and purification technology greatly improved the purity of the products, made the contents of ginkgetin and lactone as effective components reach more than 50%, further reduced the harmful components, and the content of ginkgolic acid was less than 5ppm.