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Electrochemical Oxidation of Methionine Mediated by a Fullerene-C-60 Modified Gold Electrode

机译:富勒烯-C-60修饰金电极介导的蛋氨酸的电化学氧化

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摘要

The usefulness of a C-60-fullerence modified gold (Au) electrode in mediating the oxidation of methionine in the presence of potassium ions electrolyte has been demonstrated. During cyclic voltammetry. an oxidation peak of methionine appearing at + 1.0 V vs. Ag/AgCl was observed. The oxidation current of methionine is enhanced by about 2 times using a C-60 modified gold electrode. The current enhancement is significantly dependent on pH. temperature and C-60 dosage. Calibration plot reveals linearity of up to 0.1 mM with a current sensitivity of close to 50 mA L mol(-1) and detection limit of 8.2 x 10(-6) M. The variation of scan rate Study shows that the system undergoes diffusion-controlled process. Diffusion coefficient and rate constant of methionine were determined using hydro-dynamic method (rotating disk electrode) with values of 1.11 x 10(-5) cm(2) s(-1) and 0.0026 cm s(-1) respectively for unmodified electrode while the values of diffusion coefficient and rate constant of methionine using C-60 modified Au electrode are 5.7 x 10(-6) cm(2) s(-1) and 0.0021 cm s(-1) respectively.
机译:已经证明,在钾离子电解质存在下,C-60富集修饰的金(Au)电极在介导蛋氨酸氧化中的有用性。在循环伏安法中。相对于Ag / AgCl,观察到蛋氨酸的氧化峰出现在+ 1.0V。使用C-60修饰金电极可将蛋氨酸的氧化电流提高约2倍。电流的增强很大程度上取决于pH。温度和C-60剂量。校准图揭示了高达0.1 mM的线性度,电流灵敏度接近50 mA L mol(-1),检测极限为8.2 x 10(-6)M。扫描速率的变化研究表明,系统经历了扩散-控制过程。甲硫氨酸的扩散系数和速率常数使用流体力学方法(旋转圆盘电极)测定,未修饰电极的值分别为1.11 x 10(-5)cm(2)s(-1)和0.0026 cm s(-1) C-60修饰金电极的蛋氨酸扩散系数和速率常数分别为5.7 x 10(-6)cm(2)s(-1)和0.0021 cm s(-1)。

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