Isolation and identification of flavonoids from Medicago lupulina L. flowers

Abstract

Four dominant flavonoid compounds in crystal form were isolated from flowers of Medicago lupulina L. and identified as laricytrin (3'-metoxy-3,4',5,5'7-pentahydroxyflavone), and its three glycosides: 5'-O-β-D-glucoside, 3,5'-O-β-D-diglucoside and 3,5',7-0-β-D-triglucoside. The described monoglucoside is a new compound, isolated for the first time from plant material. The remaining three flavonoid constituents appear only in trace amounts characterized as heterosides of kaempferol, quercetin and myricetin with 0-glycoside bounded in the position 3.