Antioxidant flavonoids and phenolic acids from leaves of Leea guineense G. Don (Leeaceae)
- 15 April 2003
- journal article
- research article
- Published by Wiley in Phytotherapy Research
- Vol. 17 (4), 345-347
- https://doi.org/10.1002/ptr.1141
Abstract
From leaves of Leea guineense (Leeaceae) three hydrophilic flavonoids were isolated and identified as quercetin‐3′‐sulphate‐3‐O‐α‐L‐rhamnopyranoside, quercetin‐3,3′‐disulphate and a new flavonoid sulphate, quercetin‐3,3′,4′‐trisulphate, together with kaempferol, quercetin, quercitrin, mearnsitrin, gallic acid and ethyl gallate. The structures were established by spectroscopic analysis (UV, MS, 1H‐NMR, 13C‐NMR and 2D‐NMR). Their antioxidant effect on free radical scavenging was evaluated in the DPPH assay. Copyright © 2003 John Wiley & Sons, Ltd.Keywords
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