Isolation and identification of chemical constituents from the flowers of Abelmoschus manihot(L.) Medic. (II)

Objective To study the chemical constituents from the flowers of Abelmoschus manihot(L.)Medic.Methods The compounds were isolated by chromatography by using silica gel,ODS,Sephadex LH-20 and HPLC,and identified by the chemical and physical methods,especially spectral analysis.Results Nine flavonoids which have quercetin skeleton were isolated.The structures of them were identified as quercetin(1),hyperoside(2),quercetin-3-O-β-D-glucopyranoside(3),quercetin-3-O-β-D-6″-acetylglucopyranoside(4),quercetin-3-O-robinoside(5),quercetin-3-O-rutinoside(6),quercetin-3-O-β-D-xylopyranosyl-(1→2)-β-D-galactopyranoside(7),quercetin-3′-O-β-D-glucopyranoside(8)and quercetin-7-O-β-D-glucopyranoside(9),respectively.Conclusions Compounds 4,5,7 and 9 are obtained from Abelmoschus genus for the first time.