Preparation of rare ginsenoside by transformation of ginsenoside Re catalyzed with aspartic acid / 中草药

ABSTRACT

Objective: A new, environment-friendly and efficient method for the preparation of rare ginsenoside Rg6, F4, Rk3, and Rh4 was established, which provides a theoretical basis for preparing rare ginsenosides. Methods: Rare ginsenoside was prepared by hydrolyzing ginsenoside Re using aspartic acid as the catalyst, through semi preparative HPLC, the target compounds Rg6, F4, Rk3, and Rh4 were rapidly separated from the degradation products, quantitative analysis, and structure identification by HPLC and NMR. Results: Ginsenoside Re was hydrolyzed by aspartic acid according to the ratio 10∶1 at 120℃ for 1 h, the conversion rate of ginsenoside Re was 100%, the yields of rare ginsenoside Rg6, F4, Rk3, and Rh4 were 11.2%, 13.1%, 20.6%, and 24.3%, respectively, and the purity of the four compounds were all above 99%. Conclusion: The method is simple, low-cost, and non-pollution for environment, the research has important application value for the development of green environmental protection of rare ginsenosides drugs and health food.