A hybrid sorption – Spectrometric method for determination of synthetic anionic dyes in foodstuffs

•Adsorption of anionic food dyes on hydrophobic adsorbent – Diasorb-C16 was studied.•The distribution coefficients for the adsorbent regarding dyes were calculated.•The methods for the sorption-spectroscopic determination of dyes were developed.•These methods were applied for the analysis of beverag...

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Bibliographic Details
Published in:	Food chemistry 2017-04, Vol.221, p.351-355
Main Authors:	Tikhomirova, Tatyana I., Ramazanova, Gyulselem R., Apyari, Vladimir V.
Format:	Article
Language:	eng
Subjects:	Adsorption Azo Compounds - analysis Beverages - analysis Coloring Agents - analysis Determination Diasorb-130-C16 Diffuse reflectance spectroscopy Food Analysis - methods Food dye Naphthalenesulfonates - analysis Separation Spectrum Analysis - methods Tartrazine - analysis
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Summary:	•Adsorption of anionic food dyes on hydrophobic adsorbent – Diasorb-C16 was studied.•The distribution coefficients for the adsorbent regarding dyes were calculated.•The methods for the sorption-spectroscopic determination of dyes were developed.•These methods were applied for the analysis of beverages and pharmaceuticals. A sorption-spectrometric method for determination of the anionic synthetic dyes based on their sorption on silica sorbent modified with hexadecyl groups (C16) followed by measuring the diffuse reflectance spectra on the surface of the sorbent has been proposed. Adsorption of sulfonated azo dyes Tartrazine (E102), Sunset Yellow FCF (E110), Ponceau 4R (E124) reaches maximum in acidic medium (1M HCl – pH 1). For the quinophthalone type dye Quinoline Yellow (E104), the adsorption is also maximal in an acidic medium (1M HCl – pH 2). The triphenylmethane dye Fast Green FCF (E143) is absorbed in the wider area of pH (1M HCl – pH 6). Increasing concentration of the dyes in a solution led to the increase in absorption band intensity in diffuse reflectance spectra of the adsorbent, which was used for their direct determination. The proposed method was applied to the determination of dyes in beverages and pharmaceuticals.
ISSN:	0308-8146 1873-7072