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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.
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杏丁注射液改善急性脑梗死患者神经功能的效应
INTRODUCTION Xingding is a compound agent of the fourth edition extract of ginkgo leaf,with addtion of agacore.Its main ingradient are ginkgo seed flavonoid glycoside(24% ), ginkgo seed lactone(3% ),bilobalide(3% ) and agacore(10% ).With ginkgo leaf acid smaller than 5× 10- 6,many clinical and basic research prove it has many biological effects.