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首页> 外文期刊>Electroanalysis >Preparation and electrochemical study of fisetin modified glassy carbon electrode. Application to the determination of NADH and ascorbic acid
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Preparation and electrochemical study of fisetin modified glassy carbon electrode. Application to the determination of NADH and ascorbic acid

机译：非瑟汀修饰的玻碳电极的制备和电化学研究。在测定NADH和抗坏血酸中的应用

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摘要

A new modified electrode, FMGCE, was prepared by electrodeposition of fisetin (F) at the surface of a preactivated glassy carbon electrode. Cyclic voltammetry was used to investigate the electrochemical properties of this electrode. The charge transfer rate constant, k(s), and transfer coefficient, a,, for electron transfer between electrode substrate and surface deposited F were calculated as 16.34 s(-1) and 0.54, respectively. The electrode ability towards the electrocatalytic oxidation of dihydronicotinamide adenine dinucleotide (NADH) and ascorbic acid (AA) was also studied using cyclic voltammetry and chronoamperometry as diagnostic techniques. The catalytic currents of NADH and AA were used for determination of heterogeneous rate constant, k(h), of these substrates oxidation at the surface of modified electrode. The diffusion coefficients of both substrates were also estimated using chronoamperometric results. Finally, FMGCE was used as voltammetric and amperometric sensors for determination of NADH and AA in quiet and moving solutions respectively. The calculated limit of detection of NADH and AA by voltammetry were 0.06 and 0.05 mM, respectively. While, these values decrease to 2.4 and 1.8 mu M, respectively for an amperometric procedure. The latter method was used successfully for quantification of AA in some real samples.
机译：通过在预活化的玻碳电极表面上电沉积非瑟汀（F），制备了一种新的改性电极FMGCE。循环伏安法用于研究该电极的电化学性能。电极基板与表面沉积的F之间的电子转移的电荷转移速率常数k（s）和转移系数a分别计算为16.34 s（-1）和0.54。还使用循环伏安法和计时电流法作为诊断技术，研究了电极对二氢烟碱酰胺腺嘌呤二核苷酸（NADH）和抗坏血酸（AA）的电催化氧化能力。 NADH和AA的催化电流用于确定修饰电极表面上这些底物氧化的异质速率常数k（h）。还使用计时安培法结果估计了两种基材的扩散系数。最后，将FMGCE用作伏安和安培传感器，分别测定安静和移动溶液中的NADH和AA。伏安法计算得出的NADH和AA的检出限分别为0.06和0.05 mM。而对于安培法，这些值分别降低到2.4和1.8μM。后一种方法已成功用于某些实际样品中AA的定量。

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