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首页> 外文期刊>Electroanalysis >Electrochemistry of cytochrome c immobilized on colloidal gold modified carbon paste electrodes and its electrocatalytic activity
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Electrochemistry of cytochrome c immobilized on colloidal gold modified carbon paste electrodes and its electrocatalytic activity

机译：固定在胶体金修饰碳糊电极上的细胞色素c的电化学及其电催化活性

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Colloidal gold modified carbon paste electrodes were prepared by mixing 24-nm-diameter colloidal Au particles with carbon paste. The modified electrodes displayed a low charging current and a favorable electrochemical response of hexacyanoferrate (111). The direct electrochemical behavior of a horse-heart cytochrome c (cyt.c) adsorbed on this electrode surface is described. It showed a surface-controlled electrode process with the electron transfer rate constant of (1.21 +/- 0.08) s(-1) and alpha of 0.67. Cyclic voltammograms showed small peak-to-peak separations at low scan rates. The adsorbed cyt.c maintained its activity and could also electrocatalyze the reduction of hydrogen peroxide. Since this behavior was quite pronounced the electrode was used for H2O2 detection. The Km,PP value for this sensor was found to be 2.28 +/- 0.17 mM, allowing measurements down to 0.01 mM H2O2. [References: 55]
机译：胶体金修饰的碳糊电极是通过将24 nm直径的胶体金颗粒与碳糊混合而制备的。改性电极显示出低充电电流和六氰合铁酸盐（111）的良好电化学响应。描述了吸附在该电极表面上的马心细胞色素c（cyt.c）的直接电化学行为。它显示了一种表面控制的电极工艺，其电子传输速率常数为（1.21 +/- 0.08）s（-1），α为0.67。循环伏安图在低扫描速率下显示出较小的峰峰分离。吸附的cyt.c保持其活性，并且还可以电催化过氧化氢的还原。由于这种行为非常明显，因此将电极用于H2O2检测。发现该传感器的Km，PP值为2.28 +/- 0.17 mM，可测量低至0.01 mM H2O2。 [参考：55]

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