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Chemiluminescent in vitro Estimation of the Inhibitory Constants of Antioxidants Ascorbic and Uric Acids in Fenton's Reaction in Urine

机译:化学发光法测定尿中芬顿反应中抗氧化剂抗坏血酸和尿酸的抑制常数

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The goal of this research was to measure in vitro the inhibitory constants of the antioxidants ascorbic and uric acid in urine,with lucigenin enhanced chemiluminescence (CL) in Fenton's system.Maximum CL emission is registered in urine containing H2O2 (5-10~(-4) M),Fe2+(5-10~(-5) M),EDTA(5-10~(-5) M),and chemical enhancer lucigenin (10~(-4) M) at pH 5.5 and 36°C.Ascorbic acid exhibits up to 4-fold stronger antioxidant effect than uric acid.The constants of antioxidant inhibition in urine were measured at concentrations 10~(-3) and 10~(-4) M:for ascorbic acid,5.92+-0.04 and 24.05+-1.82 mnol-sec~(-1);for uric acid,1.60+-0.02 and 21.45+-0.97 umobsec~(-1),respectively.Three phases of CL kinetics of urine are well observed:spontaneous CL (0-10 sec),fast flash of CL (10-50 sec),and latent period (50-300 sec).The antioxidant efficiency of ascorbic and uric acids in the final stage of catabolic processes in the body is discussed.
机译:这项研究的目的是在体外测量尿液中抗氧化剂抗坏血酸和尿酸的抑制常数,并在Fenton系统中用光泽精增强化学发光(CL)。在含H2O2(5-10〜(- 4)M),Fe2 +(5-10〜(-5)M),EDTA(5-10〜(-5)M)和化学增强剂光泽精(10〜(-4)M)在pH 5.5和36°抗坏血酸的抗氧化能力是尿酸的4倍。在10〜(-3)和10〜(-4)的M浓度下测量尿液中抗氧化的抑制常数:抗坏血酸为5.92 +- 0.04和24.05 + -1.82 mnol-sec〜(-1);尿酸分别为1.60 + -0.02和21.45 + -0.97 umobsec〜(-1)。观察到尿液CL动力学的三个阶段:自发CL (0-10秒),CL快速闪烁(10-50秒)和潜伏期(50-300秒)。讨论了抗坏血酸和尿酸在体内分解代谢过程的最后阶段的抗氧化效率。

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