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Application FTIR spectroscopy for identifying synthetic azodyes

Fomina Yu.A. Saratov State Medical University named after V. I. Razumovsky


FTIR spectroscopy is used to identify synthetic sulfoazo dyes, since is one of the modern and reliable methods for establishing the structure of organic compounds. The identification of synthetic dyes in various objects (food products, pharmaceuticals, cosmetics, etc.) is an urgent problem. The greatest danger to humans is represented by compounds containing various aromatic fragments in their structure, as well as an azo group, which is reduced to toxic amines under the action of intestinal microflora. These include widely used synthetic food colors Azorubin (E122), Ponceau 4R (E124), Sunset Yellow (E110), Alura Red (E129).
The aim of the work: to assess the possibility of using FTIR spectroscopy for the identification of synthetic food sulfoazo dyes, similar in chemical structure.
Structural group analysis of the compounds under study was carried out according to IR spectra recorded as disks with potassium bromide. The IR spectra of the studied compounds contain a set of absorption bands corresponding to aromatic rings, hydroxyl, azo- and sulfo- groups. The difference in the structures of E110 and E129 was reflected in the IR spectra by the presence of bands characteristic of the methyl and oxymethyl groups. The greatest differences in the IR spectra of E122 and E124 were recorded in the area of "fingerprints".


Shestopalova N.B.
Saratov State Medical University named after V. I. Razumovsky


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