Electrochemical Determination of Sudan I at a Silver Nanoparticles/Poly(Aminosulfonic Acid) Modified Glassy Carbon Electrode

Abstract

In this paper, a novel silver nanoparticles/poly(aminosulfonic acid) modified glassy carbon electrode (Ag-PASA/GCE) for the determination of Sudan I was fabricated through electrochemical immobilization. Electrochemical behavior of Sudan I at the Ag-PASA/GCE was studied by cyclic voltammetry. The polymer-modified electrode showed excellent electrocatalytic activity for the redoxidation of Sudan I. Under optimal experimental conditions, the oxidation peak current of Sudan I was linearly proportional to its concentration in a range from 4.0 × 10-8 to 4.0 × 10-6 mol/L with a correlation coefficient of 0.9986 and a detection limit of 8.0 × 10-9 mol/L. The application of the modified GCE for the determination of Sudan I in food samples showed good recovery, reproducibility and high sensitivity.