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Flow-injection methods for the determination of antioxidant activity based on free-radical processes

机译:基于自由基法测定抗氧化剂活性的流动注射方法

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摘要

Flow-injection procedures are developed for the spectrophotometry determination of the antioxidant properties of low-weight biological molecules based on their interaction with free organic radicals, namely, the on-line generated radical cation from 2,2′-azino-bis-(3-ethylbenzothiazoline-6- sulfonic acid) and the longlived 2,2′-diphenyl-1-picrylhydrazyl radical. The optical and redox properties of these radicals in aqueous and water-ethanol media are studied with and without an antioxidant in the mixture. The applicability of the methods is demonstrated on a number of exogenous antioxidants: ascorbic and uric acid, glutathione, and others, trolox, a synthetic analogue of α-tocopherol, and species of plant origin: gallic, ferulic, and caffeic acids. The comparative evaluation of the total antioxidant activity of known anti-inflammatory medicines is performed. The throughput of the methods reported is 90-200 analyses per hour.
机译:开发了流动注射程序,用于分光光度法测定低重量生物分子与自由基有机物的相互作用,即由2,2'-azino-bis-(3在线生成的自由基阳离子)的抗氧化性能。 -乙基苯并噻唑啉-6-磺酸)和长寿命的2,2'-二苯基-1-吡啶并肼基。研究了这些自由基在水和水-乙醇介质中的光学和氧化还原性质,在混合物中是否添加抗氧化剂。该方法适用于多种外源抗氧化剂:抗坏血酸和尿酸,谷胱甘肽等; trolox(α-生育酚的合成类似物)以及植物来源的种类:没食子酸,阿魏酸和咖啡酸。对已知的消炎药的总抗氧化活性进行了比较评估。报告的方法的通量为每小时90-200次分析。

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