Chemical and Pharmaceutical Bulletin
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Six New Dammarane-type Triterpene Saponins from the Leaves of Panax ginseng
De-Qiang DOUYing-Jie CHENLi-Hong LIANGFa-Gen PANGNoriko SHIMIZUTadahiro TAKEDA
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2001 Volume 49 Issue 4 Pages 442-446

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Abstract

Six new minor saponins, together with known ginsenosides, were isolated from the leaves of Panax ginseng. The new saponins were named as ginsenoside-Rh5, -Rh6, -Rh7-Rh8, -Rh9 and -Rg7, and their structures were elucidated on the basis of chemical and physicochemical evidence to be as follows: ginsenoside-Rh5: 3β, 6α, 12β, 24ζ-tetrahydroxy-dammar-20 (22), 25-diene 6-O-β-D-glucopyranoside (1), -Rh6: 3β, 6α, 12β, 20 (S)-tetrahydroxy-25-hydroperoxy-dammar-23-ene 20-O-β-D-glucopyranoside (2), -Rh7: 3β, 7β, 12β, 20 (S)-tetrahydroxy-dammar-5, 24-diene 20-O-β-D-glucopyranoside (3), -Rh8: 3β, 6α, 20 (S)-trihydroxy-dammar-24-ene-12-one 20-O-β-D-glucopyranoside (4), -Rh9: 3β, 6α, 20 (S)-trihydroxy-12β, 23-epoxy-dammar-24-ene 20-O-β-D-glucopyranoside (5) and -Rg7: 3-O-β-D-glucopyranosyl 3β, 12β, 20 (S), 24 (R)-tetrahydroxy-dammar-25-ene 20-O-β-D-glucopyranoside (6).

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© 2001 The Pharmaceutical Society of Japan
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