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1 Wiadomości Chemiczne

1 2023

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Zastosowanie spektroskopii oscylacyjnej w detekcji barwników azowych w opakowaniach do żywności

Kucharska Edyta, Michalski Jacek, Sąsiadek Wojciech, Dymińska Lucyna, Hołubniak Paulina, Hanuza Jerzy

Wiadomości Chemiczne

2023

[Z] 77, 7-8

687--718

This work is a continuation of our research on spectroscopic and structural properties and applications of a number of azo-dipyridine and phenyl-azopyridine derivatives. In the previous works, the results of DFT quantum calculations were used to discuss infrared and Raman spectra. The presented study generalizes these results using the literature data on the structure of aromatic azo compounds. Analysis of the spectra and detailed assignment of the observed bands to the specific oscillating modes enables their application to identification of azo dyes widely used in the food industry. The bioactivity of azo dyes means that the safety of their use requires the search for new methods of their detection in food. The paper shows that vibrational spectroscopy is an effective diagnostic method for identifying not only the material from which the plastic foil is made, but also the dye used for its dyeing. In this work, the method was applied to colour plastic foils used as pasta packaging. It has been shown that this foil is made of polypropylene, and azo dyes, such as orange yellow (orange dye), tartrazine (yellow dye), allura red (red dye), brilliant blue (blue dye) and a mixture of yellow and blue dyes (green dye) were used for its dyeing.