Kinetics and Mechanism of Oxidation of L a?? Methionine by Potassium Bromate in Aqueous Hydrochloric Acid Medium

Idris S.O1; Ibrahim; A.P1; Iyun J.F; Mohammed; Y

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Kinetics and Mechanism of Oxidation of L a?? Methionine by Potassium Bromate in Aqueous Hydrochloric Acid Medium

机译：L a ??的氧化动力学及机理溴酸钾在盐酸水溶液中的蛋氨酸含量

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The kinetics of the oxidation of L - methionine by bromate ions in aqueous acidic medium at a constant ionic strength, μ , of 0.50 mol dm–3 were investigated spectrophotometrically at temperature of 30.0 ± 1ºC. The reaction shows a stoichiometry of 1:2 (Methionine/ bromate), first order kinetics in [methionine], first order in [bromate] and second order dependence in [H+]. An increase in ionic strength and a decrease in dielectric constant of the reaction medium increase the rate of reaction. The reaction is catalysed by anions. Polymerization test conducted suggests the absence of free radicals. The results obtained from this study supports the operation of outer – sphere mechanism. A plausible mechanism is proposed for the reaction.

机译：在30.0±1ºC的温度下，通过分光光度法研究了在恒定的离子强度μ为0.50 mol dm-3的条件下，水性介质中溴酸根离子氧化L-蛋氨酸的动力学。该反应的化学计量比为1：2（蛋氨酸/溴酸盐），[蛋氨酸]中的一级动力学，[溴酸盐]中的一级动力学和[H +]中的二级依赖性。离子强度的增加和反应介质的介电常数的降低增加了反应速率。该反应由阴离子催化。进行的聚合测试表明不存在自由基。这项研究获得的结果支持外球机制的运作。提出了对该反应的合理机制。

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《Archives of Applied Science Research》 |2010年第5期|共页
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Idris S.O1; Ibrahim; A.P1; Iyun J.F; Mohammed; Y;
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Kinetics and Mechanism of Oxidation of L a?? Methionine by Potassium Bromate in Aqueous Hydrochloric Acid Medium

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