Electroanalytical Chemistry Laboratory, Faculty of Chemistry, University of Guilan, Namjoo Street, P.O. Box: 1914-41335, Rasht, Iran.
Electroanalytical Chemistry Laboratory, Faculty of Chemistry, University of Guilan, Namjoo Street, P.O. Box: 1914-41335, Rasht, Iran.
Talanta. 2017 Oct 1;173:60-68. doi: 10.1016/j.talanta.2017.05.062. Epub 2017 May 25.
In this paper, we have studied the electrochemical behavior of indigo carmine (IC) in the presence and absence of mediator molecules. We have used three azo dyes as mediators in our studies and the effect of mediator molecules on the electron transfer between the IC solution and the electrode surface was explained from the cyclic voltammograms data. Among these dyes, 4-(4-nitrophenilazo)N-benzyl,N-ethylaniline (NBE) showed good performance as an electron transfer mediator. The NBE/carbon paste was characterized with Fourier transform infrared spectroscopy and scanning electron microscopy methods. The redox peak currents of IC were enhanced significantly compared with those obtained at the unmodified electrode. Some parameters affecting sensor response were optimized and then the calibration curve was plotted. The oxidation peak current was proportional to the concentration of IC from 1 to 100μmolL. The detection limit was 0.36μmolL. The proposed electrode was successfully applied to the determination of IC in various real samples without complex sample pretreatment.
本文研究了靛蓝胭脂红（IC）在存在和不存在介体分子的情况下的电化学行为。我们在研究中使用了三种偶氮染料作为介体，并从循环伏安图数据解释了介体分子对 IC 溶液和电极表面之间电子转移的影响。在这些染料中，4-（4-硝基苯偶氮）-N-苄基，N-乙基苯胺（NBE）作为电子转移介体表现出良好的性能。NBE/碳糊电极采用傅里叶变换红外光谱和扫描电子显微镜方法进行了表征。与未修饰电极相比，IC 的氧化峰电流显著增强。优化了一些影响传感器响应的参数，然后绘制了校准曲线。氧化峰电流与 IC 的浓度从 1 到 100μmolL 呈正比。检测限为 0.36μmolL。该电极在无需复杂样品预处理的情况下成功应用于各种实际样品中 IC 的测定。
