Flavonoids from Lespedeza davurica

Ten flavonoids were isolated from the aboveground parts of Lespedeza davurica (Laxm.) Schindl.by column chromatography over silica gel,Sephadex LH-20 and polyamide.Their structures were identified as diosmetin (1),kaempferol (2),tamarixetin (3),luteolin (4),quercetine (5),quercetine-3-O-β-D-galactopyranoside (6),epicatechin (7),trifolin (8),isoorientin (9),and rutin (10),respectively,on the basis of their spectroscopic data.Compounds 1～10 were reported from this plant for the first time.This research showed that flavonoids,which were reported to have potent bioactivities,were abundant in L.davurica,and were probably the foundation of pharmacological effects of L.davurica.