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Triterpenoid saponins and C21 steroidal glycosides from Gymnema tingens and their glucose uptake activities†
Jinhua He,Meiyu Liu,Guangfeng Liao,Rumei Lu
RSC Advances Pub Date : 03/08/2023 00:00:00 , DOI:10.1039/D2RA07164A
Abstract

Four new triterpenoid saponins, tigensides A–D (1–4), and one new C21 steroid, tipregnane A(9), together with six known compounds were isolated from the EtOAc fraction of the roots and stems of Gymnema tingens. The chemical structures of the new compounds were determined based on their spectroscopic data, including IR, UV, NMR, and mass spectrometric analysis. All compounds were isolated for the first time. Compounds 1–11 promoted glucose uptake in the range of 1.12 to 2.52 fold, respectively. Compound 2 showed the most potent glucose uptake, with 2.52 fold enhancement. Additionally, compound 2 showed a medium effect on the GLUT4 translocation activity in L6 cells in further study.

Graphical abstract: Triterpenoid saponins and C21 steroidal glycosides from Gymnema tingens and their glucose uptake activities
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