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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Application of 2-(3,4-dihydroxyphenyl)-1,3-dithialone self-assembled monolayer on gold electrode as a nanosensor for electrocatalytic determination of dopamine and uric acid
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Application of 2-(3,4-dihydroxyphenyl)-1,3-dithialone self-assembled monolayer on gold electrode as a nanosensor for electrocatalytic determination of dopamine and uric acid

机译：2-（3,4-二羟基苯基）-1,3-二硫酮自组装膜在金电极上的应用作为纳米传感器电催化测定多巴胺和尿酸

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摘要

The electrooxidation of dopamine (DA), uric acid (UA) and their mixture on a gold electrode modified by a self-assembled monolayer of 2-(3,4- dihydroxyphenyl)-1,3-dithialone has been studied by cyclic voltammetry (CV), chronoamperometry and differential pulse voltammetry (DPV). CV was used to investigate the redox properties of the modified electrode at various scan rates and the apparent charge transfer rate constant (k_s), and transfer coefficient (α) were calculated. The mediated oxidation of DA at the modified electrode under the optimum condition (pH = 7.0) in CV occurs at a potential about 220 mV less positive than that of the unmodified gold electrode. The values of electron transfer coefficients (α), catalytic rate constant (k) and diffusion coefficient (D) were calculated for DA, using electrochemical methods. DPV exhibited a linear dynamic range over the concentration range of 0.2-250.0 μM and a detection limit (3σ) of 0.07 μM for DA. The modified electrode was used for simultaneous determination of DA and UA by DPV. The results showed that the electrode is highly efficient for the catalytic electrooxidation of DA and UA, leading to a remarkable peak resolution (～350 mV) for two compounds. The electrode was used for the determination of DA in an injection sample.
机译：通过循环伏安法研究了多巴胺（DA），尿酸（UA）及其混合物在由2-（3,4-二羟基苯基）-1,3-二硫酮自组装单层修饰的金电极上的电氧化（ CV），计时电流法和差分脉冲伏安法（DPV）。使用CV来研究改性电极在各种扫描速率下的氧化还原特性，并计算表观电荷转移速率常数（k_s）和转移系数（α）。在CV的最佳条件下（pH = 7.0），在修饰电极上DA介导的氧化发生的电位比未修饰金电极的正电位低约220 mV。使用电化学方法计算DA的电子传递系数（α），催化速率常数（k）和扩散系数（D）的值。 DPV在0.2-250.0μM的浓度范围内表现出线性动态范围，对DA的检出限（3σ）为0.07μM。修饰的电极用于通过DPV同时测定DA和UA。结果表明，该电极对DA和UA的催化电氧化效率很高，导致两种化合物具有显着的峰分离度（〜350 mV）。该电极用于测定进样中的DA。

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