Thermospray, particle beam and electrospray liquid chromatography-mass spectrometry of azo dyes

Simultaneous determination of fifteen illegal dyes in animal feeds and poultry products by ultra-high performance liquid chromatography tandem mass spectrometry

“…Because of their high sensitivity and selectivity, LC-MS based methods provide the capability of multi-component validation, quantification and microanalysis [28]. Liquid chromatography with triple quadrupole (LC-QQQ-MS) or ion trap (LC-IT-MS) were used for the simultaneous determination of azo-dyes in chili products, spices [7,29,30], malachite green, leucomalachite green and rhodamine 6G in fish [31][32][33][34].…”

Simultaneous quantitative determination of Sudan dyes using liquid chromatography–atmospheric pressure photoionization–tandem mass spectrometry

“…Thermospray, particle beam and electrospray ionisation techniques with liquid chromatography-mass spectrometry were reported for the analysis of azo dyes (Straub, Voyksner, & Keever, 1992). The particle beam EI mass spectrometric analysis resulted in molecular ion information and various fragment ions to characterise a few commercial azo dyes.…”

The structure and purity of a reference dye standard used for quantification of C.I. Solvent Red 164 in fuels

“…Commercial azo dyes often consist of a mixture of synthetic products, by-products, intermediates, and unreacted starting materials. Components in these mixtures may vary widely in their volatility, polarity, and molecular weights [2]. Even dyes that are purportedly pure are occasionally found to contain substantial amounts of impurities [3].…”