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Eur J Med Chem. 2012 Apr;50:173-8. doi: 10.1016/j.ejmech.2012.01.052. Epub 2012 Feb 3.

Triterpenes possessing an unprecedented skeleton isolated from hydrolyzate of total saponins from Gynostemma pentaphyllum.

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1
No. 51, School of Traditional Chinese Material Medica, Shenyang Pharmaceutical University, Shenyang 110016, China.

Abstract

Five novel triterpenes were isolated from hydrolyzate of total saponins from Gynostemma pentaphyllum and identified as gypensapogenin A (1), gypensapogenin B (2), gypensapogenin C (3), 3-O-β-d-glucopyranosyl-gypensapogenin D (4) and gypensapogenin D (5), two of which (1 and 2) possess unprecedented ring A. The cyclization of the side chains-3 formed five-membered cyclic ketone rings similar to ring E in 1. The 21-oic acid-21, 23-lactone was present in the side chains of 4 and 5. We also proposed the possible formation mechanisms of compounds 1-3. Compounds 1-5 were evaluated for cytotoxic activities in three cell lines including A549, U87 and Hep3B and compound 3 showed significant activities toward A549 and U87 human cancer cells (with IC 50 values at 0.11 and 0.58 μm respectively).

PMID:
22342101
DOI:
10.1016/j.ejmech.2012.01.052
[Indexed for MEDLINE]

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