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Rapid Analysis of Azo-Dyes in Food by Microchip Electrophoresis With Electrochemical Detection

Rapid Analysis of Azo-Dyes in Food by Microchip Electrophoresis With Electrochemical Detection

Nicolò Dossi, Evandro Piccin, Gino Bontempelli, Emanuel Carrilho, Joseph Wang

Electrophoresis. 2007 Nov;28(22):4240-6.

PMID: 17960535

Abstract:

A method based on microchip electrophoresis with electrochemical (EC) detection has been developed for the simultaneous determination of Yellow AB, Red 2G, Sunset Yellow, New Coccine, and Amaranth which are azo-dyes frequently added to foodstuffs. Factors affecting both separation and detection processes were examined and optimized, with best performance achieved by using a 10 mM phosphate buffer (pH 11) as BGE solution and applying a voltage of 2500 V both in the separation and in the electrokinetic injection (duration 4 s). Under these optimal conditions, the target dye analytes could be separated and detected within 300 s by applying a detection potential of -1.0 V (vs. Ag/AgCl) to the glassy carbon (GC) working electrode. The recorded peaks were characterized by a good repeatability (RSD=1.8-3.2%), high sensitivity, and a wide linear range. Detection limits of 3.8, 3.4, 3.6, 9.1, 15.1 microM were obtained for Yellow AB, Red 2G, Sunset Yellow, New Coccine, and Amaranth, respectively. Fast, sensitive, and selective response makes the new microchip protocol very attractive for the quantitative analysis of commercial soft drinks and candies.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP79873362	Fast Yellow AB		79873-36-2	Price

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