Department of Food Science, Science and Research Branch, Islamic Azad University, Mazandaran, Iran.
Food Chem. 2013 Dec 15;141(4):4311-7. doi: 10.1016/j.foodchem.2013.07.020. Epub 2013 Jul 12.
In this work, a simple and high sensitivity electrochemical sensor was developed to determine Sudan I based on Pt/CNTs nanocomposite ionic liquid modified carbon paste electrode (Pt/CNTs/ILCPE) using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV) methods. The novel sensor exhibited an obviously catalytic activity towards the oxidation of Sudan I, which can be confirmed by the increased oxidation peak current and the decreased oxidation peak potential when compared with the bare carbon paste electrode (CPE). The electron transfer coefficient (α), diffusion coefficient (D), and charge transfer resistance (Rct) of Sudan I at the modified electrode were calculated. The linear response range and detection limit were found to be 0.008-600 μmol L(-1) and 0.003 μmol L(-1), respectively. Other species did not interfere with the determination of Sudan I at a surface of propose sensor in the optimum condition. The proposed sensor was successfully applied for the determination of Sudan I in food samples with satisfactory results.
在这项工作中，我们开发了一种简单且高灵敏度的电化学传感器，用于基于 Pt/CNTs 纳米复合材料离子液体修饰碳糊电极（Pt/CNTs/ILCPE）通过循环伏安法、电化学阻抗谱（EIS）和方波伏安法（SWV）方法来测定苏丹红 I。与裸碳糊电极（CPE）相比，新型传感器对苏丹红 I 的氧化表现出明显的催化活性，这可以通过氧化峰电流的增加和氧化峰电位的降低来证实。计算了在修饰电极上苏丹红 I 的电子转移系数（α）、扩散系数（D）和电荷转移电阻（Rct）。在最佳条件下，发现线性响应范围和检测限分别为 0.008-600 μmol L(-1) 和 0.003 μmol L(-1)。在提议的传感器表面，其他物质在最佳条件下不会干扰苏丹红 I 的测定。该传感器成功地应用于食品样品中苏丹红 I 的测定，结果令人满意。
