A novel conducting poly(p-aminobenzene sulphonic acid)-based electrochemical sensor for sensitive determination of Sudan I and its application for detection in food stuffs

卷:173

Li, Bang Lin ; Luo, Jun Hua ; Luo, Hong Qun ; Li, Nian Bing

关键词: Sudan I;    Poly(p-aminobenzene sulphonic acid);    Glassy carbon electrode;    Square wave anodic stripping voltammetry;   

DOI  :  10.1016/j.foodchem.2014.10.060

学科分类：食品科学和技术

【 摘 要 】

In the present work, a new method for the determination of Sudan I has been developed based on a conducting poly(p-aminobenzene sulphonic acid) (poly(p-ABSA)) film modified electrode. The new electrochemical sensor showed strong accumulation ability and excellent electrocatalytic activity for Sudan I. Electrochemical oxidation signal of Sudan I at the poly(p-ABSA) modified glassy carbon electrode (poly(p-ABSA)/GCE) was significantly increased when compared to that at the bare GCE. The experimental conditions such as amount of alcohol, pH of buffer solution, accumulation time, and instrumental parameters for square wave anodic stripping voltammetry were optimised for the determination of Sudan I. Under optimum conditions, the linear regression equation of Sudan! was i(p) = 1.868 + 0.1213c (i(p): mu A, c: mu g L-1, R = 0.9981) from 1 to 500 mu g L-1 with a detection limit of 0.3 mu g L-1. Finally, this sensor was successfully employed to detect Sudan I in some hot chili and ketchup samples. (C) 2014 Elsevier Ltd. All rights reserved.