茉莉花茎糖类化合物抗氧化活性及其构效关系和作用机理研究
摘要： 研究广西茉莉花茎糖类的抗氧化活性。利用大孔树脂吸附结合制备液相色谱技术进行单体分离纯化，根据光谱分析进行结构鉴定。测定所得化合物对DPPH、O2-·、OH等自由基的清除能力，还原Fe3+能力，与金属离子（Fe2+）螯合能力。从广西茉莉花植物茎部位共分离得到4个化合物，分别为Molihuaside A、Sambacoside A、Sambacoside F和Cycloolivil（环橄榄树脂素）。4个化合物在清除DPPH自由基、O2-·自由基、OH自由基，还原Fe3+能力，与金属离子（Fe2+）螯合能力均呈现出较好的活性。4个化合物均为首次从广西茉莉花植物茎部位中分离得到，所具有的抗氧化活性与其所含糖类成分清除自由基、还原Fe3+、与金属离子（Fe2+）螯合等活性有关，且抗氧化活性与其结构中的羟基数目和位置以及糖苷的空间位阻有关。
关键词: 茉莉花茎, 化学成分, 糖类, 抗氧化活性, 构效关系, 作用机理
Abstract: To study the antioxidant activity of saccharides in jasmine stem of Guangxi.The separation and purification of the monomers were carried out by macroporous resin adsorption and preparative liquid chromatography.The structures were identified by spectroscopic analysis.The scavenging ability of the compounds against free radicals such as DPPH,O2-·and OH was measured,and the ability to reduce Fe3+ and chelate with metal ions (Fe2+) was determined.Four compounds were isolated from the stems of Guangxi Jasmine plants,namely molihuaside A,sambacoside A,sambacoside F and cycloolivil,respectively.The 4 compounds showed good activity in scavenging DPPH radical,O2-· radical,OH radical,reducing Fe3+ ability and chelating ability with metal ion (Fe2+).Four compounds were isolated for the first time of flowering plant stems from Guangxi jasmine,antioxidant activity has its sugar composition of scavenging free radicals,reducing Fe3+,and metal ions (Fe2+) on the chelating activity,and antioxidant activity and the structure of the number and position of hydroxyl glucoside and related to the steric hindrance.
Key words: Jasmine stems, chemical composition, polysaccharide, antioxidant activity, structure-activity relationship, action mechanism
中图分类号:
R914TQ461
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