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Analysis of Sudan I, Sudan II, Sudan III, and Sudan IV in Food by HPLC With Electrochemical Detection: Comparison of Glassy Carbon Electrode With Carbon Nanotube-Ionic Liquid Gel Modified Electrode

Analysis of Sudan I, Sudan II, Sudan III, and Sudan IV in Food by HPLC With Electrochemical Detection: Comparison of Glassy Carbon Electrode With Carbon Nanotube-Ionic Liquid Gel Modified Electrode

Orawon Chailapakul, Wanida Wonsawat, Weena Siangproh, Kate Grudpan, Yifang Zhao, Zhiwei Zhu

Food Chem. 2008 Aug 15;109(4):876-82.

PMID: 26050004

Abstract:

A method was developed for analyzing of sudan I, sudan II, sudan III, and sudan IV by high performance liquid chromatography coupled with an electrochemical detector. The electrochemical oxidation of each compound was investigated with a carbon nanotube-ionic liquid gel modified glassy carbon (MWNTs-IL-Gel/GC) electrode using cyclic voltammetry. The results were compared with those of glassy carbon electrodes. At the MWNTs-IL-Gel/GC electrode, highly reproducible, well-defined cyclic voltammograms for sudan oxidation were obtained. In the flow system, MWNTs-IL-Gel/GC exhibited highly reproducible and well-defined amperometric signals without peak tailing. In addition, the determination of sudan dyes by mean of isocratic reverse-phase HPLC, with amperometric detection at MWNTs-IL-Gel/GC and GC electrode, have been investigated. The chromatograms showed excellent separation. The detection limits ranged from 0.001 to 0.005ppm. The method was sensitive, selective and could be applicable for the assay of sudan dyes in soft drink samples.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP85836	Sudan IV		85-83-6	Price

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