Journal
JOURNAL OF ANALYTICAL CHEMISTRY
Volume 77, Issue 10, Pages 1236-1246Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1061934822100100
Keywords
aqueous biphasic systems; tetrabutylammonium bromide; food dyes; nonwoven polypropylene; extraction
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Funding
- Russian Foundation for Basic Research [20-03-00354]
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An aqueous biphasic system (ABS) was used to extract synthetic food dyes with high recovery and low detection limits. The method has been successfully applied to determine dyes in various beverages, drugs, and cosmetics.
An aqueous biphasic system (ABS) based on tetrabutylammonium bromide (TBABr) with ammonium sulfate as a salting-out agent was used to extract synthetic food dyes from aqueous solutions. Conditions for the preparation of the TBABr-H2O-(NH4)(2)SO4 ABS for microextraction preconcentration of Allura Red, Tartrazine, Azorubine, Sunset Yellow, and Fast Green were optimized: tetrabutylammonium bromide, 0.075 M and ammonium sulfate, 33 wt %. The recovery of all of the dyes was no lower than 97% at pH 2.3-9.5 for 1 min. Filtration through nonwoven polypropylene was used to facilitate phase separation and extract isolation. The concentrate was eluted with distilled water, and the dyes in the eluate were determined by spectrophotometry. The limits of detection were 0.02, 0.03, 0.03, 0.04, and 0.02 mg/L for Allura Red, Azorubine, Tartrazine, Sunset Yellow, and Fast Green, respectively. The procedure was applied to determine dyes in drinks, a mouthwash, an Easter kit for dyeing eggs, and the drug Ibuprofen.
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