甲烷氧化菌素-纳米金修饰金电极溶出伏安法对Cu^(2+)的检测

Determination of Cu^(2+) by Stripping Voltammetry with Electrodes Modified with Methanobactin-Functionalized Gold Nanoparticles

利用甲烷氧化菌素能捕捉环境中Cu^(2+)的特性,以及纳米金放大电信号的作用,制备甲烷氧化菌素功能化纳米金,通过将其修饰金电极的溶出伏安法对Cu^(2+)进行特异性检测。在优化条件下,峰电流与Cu^(2+)浓度的对数在10 nmol/L~100μmol/L范围内线性关系良好,相关系数为0.96009,检出限为1.15 nmol/L(信噪比3)。结果证明,本研究所建立的电化学新方法具有较高的检测灵敏度和稳定性,可以为未来食品中Cu^(2+)的检测提供一定理论依据。

Methanobactin-functionalized gold nanoparticles(Mb-AuNPs)were prepared based on the ability of Mb to capture copper ions in the environment and the signal amplifying function of AuNPs.Stripping voltammetry with an MbAuNPs-modified electrode could specifically detect Cu^(2+).Under the optimal conditions,the peak current response showed a good linear relationship with logarithmic copper ion concentration in the range of 10 nmol/L–100μmol/L with a correlation coefficient of 0.96009 and the detection limit was 1.15 nmol/L at a signal-to-noise ratio of 3.Accordingly,the new electrochemical method established in this study had high sensitivity and stability,which will provide theoretical basis for the detection of copper irons in foods in the future.