黄花倒水莲的化学成分及抗氧化活性研究

目的:研究黄花倒水莲Polygalafallax的化学成分及药理活性。方法:利用多种色谱技术进行分离纯化,根据理化性质和光谱分析鉴定结构。采用4个抗氧化模型对分离出来的单体进行体外活性筛选。结果:从黄花倒水莲根的醋酸乙酯部分中分离得到了7个(口山)酮类的化合物,分别鉴定为1,7-二羟基-2,3-亚甲二氧基(口山)酮(1),1-甲氧基-2,3-亚甲二氧基(口山)酮(2),3-羟基-1,2-二甲氧基(口山)酮(3),1,6,7-三羟基-2,3-二甲氧基(口山)酮(4),7-羟基-1-甲氧基-2,3-亚甲二氧基(口山)酮(5),1,3-二羟基-2-甲氧基(口山)酮(6),1,3,7-三羟基-2-甲氧基(口山)酮(7)。在药理活性研究中,化合物1-7在不同的药理模型中显示了不同程度的抗氧化活性。结论:化合物2,3,5,7为首次从黄花倒水莲中分离。该植物中的(口山)酮类成分具有一定的抗氧化作用,这也是首次对该植物的单体成分进行药理活性研究。

Chemical constituents in roots of Polygala fallax and their anti-oxidation activities in vitro

Objective: To study the chemical constituents in roots of P. fallax and their anti-oxidation activities in vitro. Method: Column chromatographic techniques were employed for isolation and purification of chemical constituents of the plant. The structures were elucidated on the basis of the spectral evidence and the physical and chemical character. The isolated compounds were screened with four anti-oxidation models in vitro. Result: Seven xanthones, 1,7-dihydroxy-2,3-methylenedioxyxanthone (1), 1-methoxy-2,3-methylenedioxyxanthone (2), 3-hydroxy-1, 2-dimethoxyxanthone (3), 1, 6, 7-trihydroxy-2, 3-dimethoxyxanthone (4), 7-hydroxy-1-methoxy-2, 3-methylenedioxyxanthone (5) , 1,3-dihydroxy-2-methoxyxanthone (6) and 1,3,7-trihydroxy-2-methoxyxanthone (7) , were isolated from the roots of P. fallax. And compounds 1 - 7 showed different anti-oxidation activities in the different pharmacological models. Conclusion: Compounds 2, 3, 5 and 7 were isolated from this plant for the first time. Xanthones from this plant showed anti-oxidation activities. The pharmacological activities of the pure compounds from this plant were also reported for the first time.