In vitro: |
Phytochemistry, 2003, 64(3):759-763. | Stilbenes from the roots of Pleuropterus ciliinervis and their antioxidant activities.[Reference: WebLink] | METHODS AND RESULTS: Two stilbene glycosides, Pieceid-2''-O-gallate and pieceid-2″-O-coumarate, were isolated from the MeOH extract of the roots of Pleuropterus ciliinervis Nakai (Polygonaceae), together with two known compounds, resveratrol and pieceid. Their structures were determined spectroscopically, particularly by 2D NMR spectroscopic analysis. The antioxidant activities of stilbenes isolated were determined in vitro against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals, superoxide radicals and by determining their lipid peroxidation inhibitory activities. Among the compounds isolated, pieceid-2″-O-gallate had the most potent inhibitory scavenging effect on DPPH, superoxide radicals and upon lipid peroxidation inhibition with IC50 values of 16.5, 23.9 and 5.1 μM, respectively.
CONCLUSIONS:
Two stilbene glycisides, (E)-pieceid-2″-O-gallate and (E)-pieceid 2″-O-cumarate, were isolated from the roots of P. ciliinervis, together with resveratrol and pieceid. They showed antioxidant activities. |
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