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


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.

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M. Wu, W. Tang, J. Guimarães, Q. Wang, P. He and Y. Fang, "Electrochemical Detection of Sudan I Using a Multi-Walled Carbon Nanotube/Chitosan Composite Modified Glassy Carbon Electrode," American Journal of Analytical Chemistry, Vol. 4 No. 6A, 2013, pp. 1-6. doi: 10.4236/ajac.2013.46A001.

Conflicts of Interest

The authors declare no conflicts of interest.


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