Preliminary Study on the Chemical Constituents from the Rhizoma of Polygonum barbatum L. in Vietnam

The first study on the phytochemistry of Polygonum barbatum L. growing in Vietnam has been done. Four compounds b-sitosterol (1),ursolic acid (2), oleanolic acid (3) and daucosterol (4) were isolated from the n-hexane fraction of 90% aqueous ethanol extract of the rhizoma ofPolygonum barbatum L.. The structures of these compounds were identified on the basis of NMR, MS spectral analysis and in comparison with the published NMR data.

Keywords: Polygonum barbatum L., Ursolic acid, Oleanolic acid.

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