New hypoglycemic constituents in "gymnemic acid" from Gymnema sylvestre

N Murakami, T Murakami, M Kadoya, H Matsuda, J Yamahara, M Yoshikawa
Chemical & Pharmaceutical Bulletin 1996, 44 (2): 469-71
Investigation of hypoglycemic activity of major saponin constituents from "gymnemic acid", a crude saponin fraction of G. sylvestre, exposed not only two new saponins, gymnemosides a (1) and b (2), but also gymnemoside b and gymnemic acid V (7) as active principles. Furthermore, an acetyl group linked 16- or 22-hydroxy group in 1 and 2 was found to migrate easily to primary 28-hydroxyl group, while acyl migration from 28-hydroxy group in 3 was little observed.

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