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[摘要]
目的 研究高翅果菊Pterocypsela elata根茎中的主要化学成分,探讨lactuside B的抗脑缺血活性。方法 采用柱色谱对植物中的提取物进行分离提纯,并利用现代波谱方法分析鉴定,确定化合物的结构;采用大鼠不完全性脑缺血模型,测定大鼠脑组织的含水量、MDA和SOD值,检测lactuside B的抗脑缺血活性。结果 从该植物中分离出10个化合物,分别鉴定为莴苣苷B(lactuside B,1)、11β,13-二氢莴苣内酯乙酸酯(2)、β-谷甾醇(3)、胡萝卜苷(4)、(24R)-5α-豆甾-7,22(E)-二烯-3α-醇(5)、3,3′,4-三甲氧基鞣花酸(6)、β-香树脂醇(7)、齐墩果酸(8)、二十六碳酸(9)、硬脂酸(10)。其中化合物1为主要成分,得率0.15%;lactuside B可降低脑组织含水量,降低缺血后脑组织MDA的量,升高SOD的量。结论 10个化合物均为首次从该植物中分离获得,化合物1为主要成分,具有明显的抗脑缺血作用。
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[Abstract]
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),11β,13-dihydrolactucin acetate(2),β-sitosterol(3),daucosterol(4),(24R)-5α-stigrnast-7,22(E)-dien-3α-ol(5),3,3',4-trimethoxylellagic acid(6),β-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.
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