Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Methanol-involved heterogeneous transformation of ginsenoside Rb1 to rare ginsenosides using heteropolyacids embedded in mesoporous silica with HPLC-MS investigation

  • Mengya Zhao (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Yusheng Xiao (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Yanyan Chang (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Lu Tian (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Yujiang Zhou (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Shuying Liu (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Huanxi Zhao (Jilin Ginseng Academy, Changchun University of Chinese Medicine) ;
  • Yang Xiu (Jilin Ginseng Academy, Changchun University of Chinese Medicine)
  • Received : 2023.08.31
  • Accepted : 2024.01.26
  • Published : 2024.07.01
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Abstract

Background: The biological activity and pharmacological effects of rare ginsenosides have been proven to be superior to those of the major ginsenosides, but they are rarely found in ginseng. Methods: Ginsenoside Rb1 was chemically transformed with the involvement of methanol molecules by a synthesized heterogeneous catalyst 12-HPW@MeSi, which was obtained by the immobilization of 12-phosphotungstic acid on a mesoporous silica framework. High-performance liquid chromatography coupled with mass spectrometry was used to identify the transformation products. Results: A total of 18 transformation products were obtained and identified. Methanol was found to be involved in the formation of 8 products formed by the addition of methanol molecules to the C-24 (25), C-20 (21) or C-20 (22) double bonds of the aglycone. The transformation pathways of ginsenoside Rb1 involved deglycosylation, addition, elimination, cycloaddition, and epimerization reactions. These pathways could be elucidated in terms of the stability of the generated carbenium ion. In addition, 12-HPW@MeSi was able to maintain a 60.5% conversion rate of Rb1 after 5 cycles. Conclusion: Tandem and high-resolution mass spectrometry analysis allowed rapid and accurate identification of the transformation products through the characteristic fragment ions and neutral loss. Rare ginsenosides with methoxyl groups grafted at the C-25 and C-20 positions were obtained for the first time by chemical transformation using the composite catalyst 12-HPW@MeSi, which also enabled cyclic heterogeneous transformation and facile centrifugal separation of ginsenosides. This work provides an efficient and recyclable strategy for the preparation of rare ginsenosides with the involvement of organic molecules.

Keywords

Acknowledgement

This work was financially supported by the Science and Technology Development Plan Project of Jilin Province, China (No. 20210204098YY and YDZJ202201ZYTS261) and the Scientific Research Project of Jilin Provincial Education Department, China (No. JJKH20241090KJ).

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