Flavone and Flavonol Glycosides from the Leaves of Triumfetta procumbens in Ryukyu Islands

Abstract

Abstract Four flavonoids were isolated from the leaves of Triumfetta procumbens in Ryukyu Islands for the first time. They were identified as apigenin 7-O-glucuronide, luteolin 7-O-glucuronide, schaftoside and kaempferol 3-O-(p-coumaroylglucoside) by UV, LC-MS, acid hydrolysis, and direct TLC and HPLC comparisons with authentic samples. From the species belonging to the family Tiliaceae sensu stricto including the genus Triumfetta, some flavonols and flavones have been found together with a few dihydroflavonols and proanthocyanidins. However, three flavonoid O-glycosides and C-glycoside except for kaempferol 3-O-(p-coumaroylglucoside), which were isolated in this experiment, were reported from the family Tiliaceae s.s. for the first time