Selective and sensitive dopamine (DPA) sensor was developed using hydrothermally prepared functionalized multi-walled carbon nanotube–coated bismuth molybdate (f-MWCNT@BMO). The f-MWCNT@BMO-reinforced electrode exhibited an outstanding electrocatalytic activity towards DPA oxidation. The nanocomposite-reinforced electrode displayed a rapid response towards DPA sensing and possessed the minimized potential of (E_pa + 0.285 V vs Ag/AgCl) in 0.1 M phosphate buffer (PB). The electrochemical results of prepared sensors were analyzed using the differential pulse voltammetry method (DPV). As a result, the f-MWCNT@BMO-reinforced electrode exhibited a widelinear range of 10 nM - 814 μM with a very low detection limit of 3.4 nM towards DPA oxidation. The developed sensor shows excellent selectivity in presence of similar functional group biomolecules. The detection of DPA in real samples was evaluated in human serum, as the results of the proposed sensor possessed good recoveries.

Graphical abstract

中文翻译：

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合理设计的 f-MWCNT 涂层钼酸铋 (f-MWCNT@BMO) 纳米复合材料用于生物样品中生物分子多巴胺的伏安检测

使用水热制备的功能化多壁碳纳米管涂层钼酸铋 (f-MWCNT@BMO) 开发了选择性和灵敏的多巴胺 (DPA) 传感器。f-MWCNT@BMO 增强电极对 DPA 氧化表现出优异的电催化活性。纳米复合材料增强电极对 DPA 传感显示出快速响应，并具有 ( E _pa + 0.285 V vs Ag/AgCl) 在 0.1 M 磷酸盐缓冲液 (PB) 中。使用差分脉冲伏安法（DPV）分析制备的传感器的电化学结果。因此，f-MWCNT@BMO 增强电极表现出 10 nM - 814 μM 的宽线性范围，对 DPA 氧化的检测限非常低，仅为 3.4 nM。开发的传感器在存在类似官能团的生物分子时显示出优异的选择性。实际样品中 DPA 的检测在人血清中进行了评估，因为所提出的传感器的结果具有良好的回收率。

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