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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Kinetic Study of the Mechanism of Free-Radical Scavenging Action in Curcumin:Effects of Solvent and pH
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Kinetic Study of the Mechanism of Free-Radical Scavenging Action in Curcumin:Effects of Solvent and pH

机译:姜黄素自由基清除作用机理的动力学研究:溶剂和pH的影响

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摘要

A kinetic study was performed for the free-radical scavenging actions of curcumin and half-curcumin,which has a half-structure of curcumin,in order to clarify the mechanism of free-radical-scavenging in curcumin.The second-order rate constants for radical-scavenging reactions of curcumin and half-curcumin were measured by a stopped-flow spec-trophotometer in several organic solvents (methanol,ethanol,acetonitrile,chloroform,and benzene) and in aqueous Triton X-100 (5.0 wt %) micelle solutions at various pH.The difference in the rate constant and solvent dependence between curcumin and half-curcumin suggests that the enol structure with the intramolecular hydrogen-bond of curcumin strongly enhances the radical-scavenging activity.Furthermore,notable pH dependences were observed for the rate constants of curcumin and half-curcumin in micelle solutions,suggesting that the acid-base dissociation equilibrium of phenol-protons in curcumin and half-curcumin affects their radical-scavenging activities.
机译:为了阐明姜黄素中自由基清除的机理,对姜黄素和半姜黄素具有半结构的自由基清除作用进行了动力学研究。在几种有机溶剂(甲醇,乙醇,乙腈,氯仿和苯)和Triton X-100水溶液(5.0 wt%)的胶束溶液中,通过停流分光光度计测量姜黄素和半姜黄素的自由基清除反应。姜黄素和半姜黄素之间的速率常数和溶剂依赖性的差异表明,姜黄素分子内氢键的烯醇结构强烈增强了自由基清除活性。此外,速率对pH的依赖性也很明显。胶束溶液中姜黄素和半姜黄素的常数,表明姜黄素和半姜黄素中酚质子的酸碱解离平衡会影响它们的自由基清除活性活动。

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