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首页> 外文期刊>International Journal of Electrochemical Science >Electrocatalytic Detection of Isoproterenol at a Ferrocene-Multiwall Carbon Nanotubes Paste Electrode
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Electrocatalytic Detection of Isoproterenol at a Ferrocene-Multiwall Carbon Nanotubes Paste Electrode

机译：二茂铁-多壁碳纳米管粘贴电极对异丙肾上腺素的电催化检测

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摘要

A sensitive and selective electrochemical method for the determination of isoproterenol (ISPT) wasdeveloped by using a ferrocene multi wall carbon nanotubes paste electrode (FCMWCNTPE). Thefabrication of FCMWCNTPE and its electrocatalytic effect for electrochemical oxidation of ISPT wereinvestigated by electrochemical impedance spectroscopy (EIS) and voltammetric methods. The cyclicvoltammetric results indicate that multi wall carbon nanotubes (MCNTs) remarkably enhance theoxidation of ISPT in wide pH range of 2.0.0, which is leading to considerable improvement ofanodic peak current for ISPT, and allow the development of a highly sensitive voltammetric sensor fordetermination of ISPT in pharmaceutical and urine samples. It has been found that under optimumcondition (pH 5.0) in cyclic voltammetry, the oxidation of ISPT occurred at a potential about 140 mVless positive than that unmodified carbon paste electrode. The kinetic parameters such as electrontransfer coefficient, and catalytic reaction rate constant, kh were also determined usingelectrochemical approaches. Finally, differential pulse voltammetry (DPV) exhibited two wide linear dynamic ranges and a lower detection limit of 0.07 mol L for ISPT.
机译：利用二茂铁多壁碳纳米管糊状电极（FCMWCNTPE）建立了灵敏的选择性电化学方法测定异丙肾上腺素（ISPT）。通过电化学阻抗谱（EIS）和伏安法研究了FCMWCNTPE的制备及其对ISPT电化学氧化的电催化作用。循环伏安法的结果表明，多壁碳纳米管（MCNT）在2.0.0的宽pH范围内显着增强了ISPT的氧化，这导致ISPT的阳极峰值电流得到了显着改善，并允许开发一种高灵敏度的伏安传感器来测定药物和尿液样品中的ISPT。已经发现，在循环伏安法的最佳条件（pH 5.0）下，ISPT的氧化发生在比未修饰的碳糊电极低约140mV的正电势下。还使用电化学方法确定了动力学参数，例如电子转移系数和催化反应速率常数kh。最后，差分脉冲伏安法（DPV）表现出两个宽的线性动态范围，并且对ISPT的检测下限为0.07 molL。

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