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首页> 外文期刊>Redox report: communications in free radical research >Antioxidant properties of complexes of flavonoids with metal ions
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Antioxidant properties of complexes of flavonoids with metal ions

机译：类黄酮与金属离子配合物的抗氧化性能

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The formation of complexes of metal ions with the flavonoids quercetin (L1), rutin (L2), galangin (L3) and catechin (L4) has been investigated by UV-visible spectroscopy. The antioxidant activities of the compounds were evaluated by using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicalscavenging method. In this work, we have shown that the complexed flavonoids are much more effective free radical scavengers than the free flavonoids. We suggest that the higher antioxidant activity of the complexes is due to the acquisition of additional superoxide dismutating centers. Radical scavenging activities of the compounds were also investigated from an electrochemical point of view. There is a relationship between the logarithm of the antioxidant activity (represented by EC50) and the oxidation potential. The synergic effect of the complexes and ascorbic acid were studied by [13C]-NMR analyses. The results show that ascorbic acid can protect flavonoids from oxidative degradation, and reveal antioxidant synergies between ascorbic acid and the compounds.
机译：通过紫外-可见光谱研究了金属离子与类黄酮槲皮素（L1），芦丁（L2），高良姜精（L3）和儿茶素（L4）的配合物的形成。化合物的抗氧化活性通过使用1,1-二苯基-2-吡啶并肼基（DPPH）自由基清除方法进行评估。在这项工作中，我们已经表明，复合类黄酮比游离类黄酮更有效地清除自由基。我们建议配合物较高的抗氧化活性是由于获得了额外的超氧化物歧化中心。还从电化学角度研究了化合物的自由基清除活性。抗氧化剂活性的对数（以EC50表示）与氧化电位之间存在关系。通过[13 C] -NMR分析研究了配合物与抗坏血酸的协同作用。结果表明，抗坏血酸可以保护类黄酮免于氧化降解，并显示出抗坏血酸与化合物之间的抗氧化协同作用。

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