RESUMEN
Objective To investigate the major chemical composition in rhizome of Pterocypsela elata and explore the activity of lactuside B against brain ischemia.Methods The compounds were isolated and purified by silica gel column chromatography and elucidated by spectroscopic experiments;The model of partial brain ischemia was used to detect water content,MDA and SOD levels in brain tissue in order to observe the activity of lactuside B against brain ischemia.Results Ten compounds were obtained and established as lactuside B(1),11?,13-dihydrolactucin acetate(2),?-sitosterol(3),daucosterol(4),(24R)-5?-stigrnast-7,22(E)-dien-3?-ol(5),3,3',4-trimethoxylellagic acid(6),?-amyrin(7),oleanolic acid(8),n-hexacosanic acid(9),and stearic acid(10).Lactuside B was a key component,and it's yield was 0.15%.Contents of water and MDA level in the brain tissue were significantly decreased,and the SOD content notably increased in all groups of lactuside B.Conclusion Ten compounds are all isolated from this plant for the first time.Compound 1 is a key component which possesses obvious activity against brain ischemia.