Flavonoids of Erigeron canadensis

Objective:To study the flavonoids of Erigeron canadensis.Method:The constituents of EtOH extraction from the whole plant of E.canadensis were isolated and purified by repeated column chromatography.These compounds were identified by their physical and spectral data.Result:Twelve flavonoids were isolated and identified as quercetin-7-O-β-D-galactopyranoside(1),quercetin(2),luteolin(3),apigenin(4),5,7,4'-trihydroxy-3'-methoxy flavone(5),quercetin-3-α-rhamnopyranoside(6),quercetin-3-O-β-D-glucopyranoside(7),apigenin-7-O-β-D-glucopyranoside(8),luteolin-7-O-β-D-glucuronide methyl ester(9),4'-hydroxy baicalein-7-O-β-D-glucopyranoside(10),baicalein(11),rutin(12).Conclusion:Compound 1 was isolated from the Compositae family for the first time.Compound 5 and 9 were firstly isolated from the genus Erigeron.Compound 3,4,7,8 and 11 were isolated from E.canadensis for the first time.