用循环伏安法(cyclic voltammetry,CV)制备了聚瓜氨酸修饰电极(polycitrulline modified glassy carbon electrode,PCit/GCE),并研究了苏丹红Ⅰ在该修饰电极上的电化学行为。结果表明,PCit/GCE对苏丹红Ⅰ具有明显的电催化作用,在电位0.12、0.01 V处苏丹红Ⅰ在PCit/GCE上出现一对明显氧化还原峰。苏丹红Ⅰ浓度在2.0×10^-7~2.0×10^-5 mol/L范围内与氧化峰电流呈正比,相关系数R为0.998 1,检出限为6.0×10^-8 mol/L。该修饰电极具有良好的稳定性和灵敏性,可用于实际样品中苏丹红Ⅰ含量的测定,回收率为97.0%~102.0%。

A polycitrulline modified glassy carbon electrode (PCit/GCE) is prepared via cyclic voltammetry.The electrochemical behavior of Sudan Ⅰ at the modified electrode is studied.Results show that PCit/GCE has an obvious eletrocatalytic effect on Sudan Ⅰ,and a pair of REDOX peaks of Sudan Ⅰ appear on PCit/GCE at 0.12 V and 0.01 V potentials,respectively.The oxidation peak current is proportional to the concentration of Sudan Ⅰ within a linear range of 2.0×10^-7-2.0×10^-5 mol·L^-1,a correlation coefficient (R) of 0.998 1,and a detection limit of 6.0×10^-8 mol·L^-1.This modified glassy carbon electrode exhibits good stability and sensitivity,can be applied to the determination of Sudan Ⅰ in actual sample with recoveries of 97.0%-102.0%.

吕惠萍(1985-),女,硕士,实验师,研究方向为电化学分析及检测。