首页> 外文期刊>Free radical research >Redox reactions of the urate radical/urate couple with the superoxide radical anion, the tryptophan neutral radical and selected flavonoids in neutral aqueous solutions.
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Redox reactions of the urate radical/urate couple with the superoxide radical anion, the tryptophan neutral radical and selected flavonoids in neutral aqueous solutions.

机译:在中性水溶液中,尿酸盐自由基/尿酸盐与超氧化物自由基阴离子,色氨酸中性自由基和选定的类黄酮的氧化还原反应。

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摘要

The kinetics of several processes involving the potential antioxidant role of urate in physiological systems have been investigated by pulse radiolysis. While the monoanionic urate radical, .UH-, can be produced directly by oxidation with .Br2- or .OH, it can also be generated by oxidation with the neutral tryptophan radical, .Trp, with a rate constant of 2 x 10(7) M-1s-1. This radical, .UH-, reacts with .O2- with a rate constant of 8 x 10(8) M-1s-1. Also, .UH- is reduced by flavonoids, quercetin and rutin in CTAB micelles at rate constants of 6 x 10(6) M-1s-1 and 1 x 10(6) M-1s-1, respectively. These results can be of value by providing reference data useful in further investigation of the antioxidant character of urate in more complex biological systems.
机译:已通过脉冲辐射分解研究了涉及尿酸盐在生理系统中潜在抗氧化作用的几种过程的动力学。单阴离子尿酸根自由基.UH-可以直接通过.Br2-或.OH氧化生成,也可以通过中性色氨酸自由基.Trp氧化生成,速率常数为2 x 10(7) M-1s-1。该自由基.UH-与.O2-反应,速率常数为8 x 10(8)M-1s-1。同样,.UH-在CTAB胶束中被类黄酮,槲皮素和芦丁还原,其速率常数分别为6 x 10(6)M-1s-1和1 x 10(6)M-1s-1。通过提供参考数据可用于进一步研究更复杂的生物系统中尿酸盐的抗氧化特性,这些结果可能有价值。

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