TITLE:
Electrochemical Detection of Sudan I Using a Multi-Walled Carbon Nanotube/Chitosan Composite Modified Glassy Carbon Electrode
AUTHORS:
Min Wu, Wanrong Tang, Junlin Guimarães, Qingjiang Wang, Pingang He, Yuzhi Fang
KEYWORDS:
Sudan I; Electrochemical Detection; Chitosan; Multi-Walled Carbon Nanotubes
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.6A,
June
21,
2013
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.