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[摘要]
目的 对冬青科冬青属植物枸骨Ilex cornuta 茎进行化学成分研究,并考察分得化合物的自由基清除能力。方法 利用硅胶、中压柱色谱及半制备高效液相色谱等方法,对枸骨茎的化学成分进行系统分离;通过质谱、核磁共振谱等光谱数据鉴定化合物结构;利用DPPH 清除自由基实验测定化合物1~9的抗氧化活性。结果 从枸骨茎50%乙醇提取物中分离并鉴定了15 个化合物,分别为3,4-二咖啡酰奎宁酸(1)、3,4,5-三咖啡酰奎宁酸(2)、4,5-二咖啡酰奎宁酸甲酯(3)、3,4-二咖啡酰奎宁酸甲酯(4)、3,5-二咖啡酰奎宁酸甲酯(5)、3,4,5-三咖啡酰奎宁酸甲酯(6)、丁香醛(7)、没食子酸乙酯(8)、二氢芥子醇(9)、2,6-二甲氧基-1,4-苯醌(10)、牛蒡苷元(11)、1-O-香草酸-6-(3",5"-二甲氧基没食子酰)-β-D-吡喃葡萄糖苷(12)、木质素苷(13)、(+)-(7S,8S)-3,5-二甲氧基-4-羟基苯基丙三醇-8-O-β-D-吡喃葡萄糖苷(14)、夏佛托苷(15)。结论 化合物6、8~10、14、15为首次从该属植物中分离得到,化合物2、7、11、12为首次从该植物中分离得到;化合物1~6具有显著的清除自由基作用。
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[Abstract]
Objective To investigate the chemical constituents in the stems of Ilex cornuta and the ability of scavenging free radicals of compounds 1-9. Methods The compounds were isolated and purified by silica gel, medium pressure column chromatography, and semi-preparative liquid chromatography, and their structures were elucidated by chemical properties and spectroscopic analyses. The antifreeradical efficiency of compounds 1-9 was evaluated by DPPH radical scavenging assay. Results Fifteen compounds were isolated and their structures were identified as isochlorogenic acid B (1), 3,4,5-tricaffeoylquinic acid (2), 4,5-di-O-caffeoyl quinic acid methyl ester (3), 3,4-di-O-caffeoyl quinicacid methyl ester (4), 3,5-di-O-caffeoyl quinicacid methyl ester (5), 3,4,5-tri-O-caffeoyl quinic acid methyl ester (6), 3,5-dimethoxy-4-hydroxybenzaldehyde (7), ethyl gallate (8), dihydrosyringenin (9), 2,6-dimethoxy-1,4-benzoquinone (10), arctigenin (11), 1-O-(vanillic acid)-6-O-(3",5"-dimethoxy-galloyl)-β-D-glycoside (12), (+)-1-hydroxypinoresinol-1-O-β-D-glucopyranoside (13), (+)-(7S,8S)-syringylglycerol 8-O-β-D-glucopyranoside (14), and schaftoside (15). Compounds 1-7 had good antifreeradical efficiency. Conclusion Compounds 6, 8-10, 14, and 15 are obtained from the plants of Ilex L. the first time, and compounds 2, 7, 11, and 12 are obtained from this plant for the first time. Compounds 1-6 have good antifreeradical efficiency.
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