Citation:
LAN Wen-Jian, LI Hou-Jin. Chemical Composition of Oldenlandia cantonensis How[J]. Chinese Journal of Applied Chemistry,
;2006, 23(8): 871-874.
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The chemical composition of Oldenlandia cantonensis How,a herbal medicine is reported.A new pentacyclic triterpenoid,urs-12-en-29α-oic acid-3β-ol was obtained from the EtOAc-eluted fraction of the ethanol extract of Oldenlandia cantonensis How.The structure was elucidated by spectroscopy methods, including NMR(1D and 2D),IR,and MS.Urs-12-en-29α-oic acid-3β-ol exhibited potent inhibiting effect against the human DNA topoisomerase Ⅰ(hTopo Ⅰ),the cancer cell lines BEL-7402,and MCG-803, with the IC50 values 12.0×10-6,6.5×10-6 and 8.0×10-6 g/mL,respectively.The low polarity fatty oil,the eluted fraction of V(petroleum ether):V(EtOAc)=20:1 was also quantitatively analyzed by gas chromato-graphy mass spectrometry(GC-MS).As a result,60 compounds were detected.The fatty oil mainly composed of long chain aliphatics,terpene and steroid compounds,with percentages of 36.16%,6.42% and 9.28%,respectively.
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