Isolation and characterization of xanthine oxidase inhibitory constituents of Pyrenacantha staudtii / 药学学报

Six compounds have been isolated from the leaves of Pyrenacantha staudtii,two of which are new compounds.The new compounds have been characterized as kaempherol 3-O-β-rhamnopyranosyl (1→6)β-D-glucopyranoside (1) and 4-β-glucopyranosyl-(2-furyl)-5-methy-1,2-glucopyranoside phenylmethanone (2).The known compounds are 3-pyridinecarboxylic acid (3),β-sitosterol (4),sitosterol 3-O-β-glucopyranoside (5) and taraxerol (6).Their structures were determined by spectroscopic and chemical evidences.The two new compounds together with 3-pyridinecarboxylic acid showed significant in vitro xanthine oxidase inhibitory activity.To the best of our knowledge,this is the first report of these compounds from this plant.