过山蕨乙醇提取物化学成分的分离鉴定

Isolation and Identification of Chemical Constituents from Ethanol Extract of Camptosorus sibiricus

目的:研究过山蕨Camptosorus sibiricus全草95%乙醇提取物的化学成分,并测定其抗氧化活性。方法:采用正相硅胶,小孔树脂(MCI),LH-20型羟丙基葡聚糖凝胶(Sephadex LH-20),制备薄层色谱和反相HPLC等多种色谱技术进行分离纯化,通过波谱数据分析,结合文献鉴定了化合物的结构。结果:共分离得到11个化合物,分别鉴定为香豆酸(1),香豆酸4-O-β-D-吡喃葡萄糖苷(2),顺式对香豆酸4-O-β-D-吡喃葡萄糖苷(3),阿魏酸4-O-β-D-吡喃葡萄糖苷(4),咖啡酸甲酯(5),阿魏酸甲酯(6),丁香酸(7),丁香酸-4-O-β-D-吡喃葡萄糖苷(8),原儿茶醛(9),香草醛(10),丁香醛(11)。结论:化合物3~11均为首次从过山蕨属中分离得到。对从过山蕨乙醇提取物中分离的11个化合物采用类超氧化物歧化酶(SOD-like)活性测试法进行了抗氧化活性研究,结果显示化合物7,9~11均有一定活性,四者的半抑制浓度(IC50)分别为16. 70,11. 70,12. 23,13. 52μmol·L-1;在浓度1. 0×10-4mol·L^-1下,其他化合物均未表现出活性。

Objective: To study the chemical constituents in 95% ethanol extract of the whole plant of Camptosorus sibiricus and determine its antioxidant activity. Method: Compounds were isolated by a combination of various chromato-graphic techniques,including column chromatography over silica gel and Sephadex LH-20 and reversed-phase HPLC. Their structures were identified on the basis of physicochemical properties and spectral data reported in the literature. Result: Eleven compounds were identified as trans-p-coumaric acid ( 1 ),trans-pcoumaric acid 4-O-β-D-glucoside ( 2),cis-p-coumaric acid 4-O-β-D-glucoside ( 3),( E)-ferulic acid-4-O-β-Dglucoside ( 4),caffeic acid methyl ester ( 5),ferulic acid methyl ester ( 6),syringic acid ( 7),syringic acid-4- O-β-D-glucopyranoside ( 8),protocatechualdehyde ( 9),vanillain ( 10) and syringaldehyde ( 11),respectively. Conclusion: Compounds 3-11 are isolated from the genus Camptosorus for the first time. In the in vitro SOD-like activity assays,compounds 7,9-11 show an antioxidant activity with half maximal inhibitory concentration ( IC50 ) values of 16.70,11.70,12.23 and 13.52 μmol·L ^- 1,respectively.