Electrochemical Detection of Sudan I Using a Multi-Walled Carbon Nanotube/Chitosan Composite Modified Glassy Carbon Electrode

Min Wu, Wanrong Tang, Junlin Guimarães, Qingjiang Wang, Pingang He, Yuzhi Fang

Department of Chemistry, East China Normal University, Shanghai, China.

DOI: 10.4236/ajac.2013.46A001                

Abstract

In this work, a simple and sensitive electrochemical method was developed to determine Sudan I by cyclic voltammetry and differential pulse voltammetry using a glassy carbon electrode modified with a chitosan/carbon nanotube composite. In cyclic voltammetry, Sudan I exhibited a well-defined oxidation peak located at 0.72 V at the multi-walled carbon nanotube (MWCNT)/chitosan-modified GCE. The determination conditions, including pH, scan rate, and chitosan: MWCNT mass ratio at the modified electrode, were optimized. Under the optimum experimental conditions, Sudan I could be linearly detected by differential pulse voltammetry with a detection limit of 3.0 × 10^-8 mol?L^-1.

Keywords

Sudan I; Electrochemical Detection; Chitosan; Multi-Walled Carbon Nanotubes

Conflicts of Interest

The authors declare no conflicts of interest.

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