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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Highly selective detection of dopamine in the presence of ascorbic acid and uric acid using thioglycolic acid capped CdTe quantum dots modified electrode
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Highly selective detection of dopamine in the presence of ascorbic acid and uric acid using thioglycolic acid capped CdTe quantum dots modified electrode

机译：使用巯基乙酸封端的CdTe量子点修饰电极在抗坏血酸和尿酸存在下高选择性检测多巴胺

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摘要

In this work, cadmium telluride (CdTe) quantum dots (QDs) have been successfully applied for construction of a novel chemically modified electrode for determination of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA). The small CdTe QDs were synthesized by using a wet chemical routes in the presence of thioglycolic acid (TGA), as capping agent at pH 9.5, having particle diameters of 1–3 nm. The synthesized QDs were immobilized on the surface of gold disk electrode by self assembly method in dark conditions for 30 h and electrochemically characterized. The modified CdTe QDs-based electrode afforded the simultaneous detection of these three compounds with wide peak separations, which allowed the interferences to be masked with applied potential. Using a potential window of 0–350 mV, where only dopamine was electroactive, a detection limit of 8.27 × 10~(-9) M and 1.30 × 10~(-9) M were calculated from square wave voltammetry and amperometry, respectively.
机译：在这项工作中，碲化镉（CdTe）量子点（QDs）已成功应用于在抗坏血酸（AA）和尿酸（UA）存在下测定多巴胺（DA）的新型化学修饰电极的构建。通过在巯基乙酸（TGA）的存在下，采用湿式化学路线合成了小的CdTe QD，作为盖帽剂，pH值为9.5，粒径为1-3 nm。在黑暗条件下，通过自组装法将合成的量子点固定在金盘电极的表面上30 h，并进行电化学表征。改进的基于CdTe QDs的电极可同时检测这三种化合物，并具有宽的峰间距，从而可以用施加的电位掩盖干扰。使用0-350 mV的电位窗口，其中仅多巴胺是电活性的，根据方波伏安法和安培计分别计算出检测极限8.27×10〜（-9）M和1.30×10〜（-9）M。

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