Gas Chromatographic Identification of Azo-dyes

Abstract

Identification of azo-, and disazo-dyes by gas chromatography was studied using their reduction products, aniline, toluidine, xylidine, and phenylenediamine. Aniline. three near boiling point isomers of toluidine, and three isomers of xylidine derived from azo-dyes were sufficiently detected each other on 5% PEG 20M+1.2% KOH/Chromosorb W column at 130°, and three isomers of phenylenediamine and p-toluylenediamine derived from disazo-dyes were given good results using same column at 180°C. © 1973, Japanese Society for Food Hygiene and Safety. All rights reserved.