DETERMINATION OF FOOD DYES IN BINARY MIXTURES BY ABSORBANCE SUBTRACTION METHOD
DOI:
https://doi.org/10.15421/jchemtech.v31i4.275326Keywords:
simultaneous determination; synthetic food dyes; E110 (Sunset Yellow FCF); E124 (Ponceau 4R, Bright red 4R); E102 (Tartrazine) spectrophotometry; absorbance subtraction methodAbstract
A simple, fast and highly sensitive method for the determination of synthetic food dyes in binary mixtures by the absorbance subtraction method has been developed. In accordance with the requirements of the methodology in the determination of Sunset Yellow (E110), Ponceau 4R (E124) and Tartrazine (E102) dyes, analytical wavelengths λ1iso=510 nm and λ2=560 nm as well as λ1'iso=450 nm and λ2’=525 nm were chosen for the first (E110 and E124) and second (E102 and E110) mixtures, respectively. Simultaneous determination of dyes E124, E110 and E102 is possible with satisfactory accuracy in the range of their concentrations from 1 to 30 μg/ml. It was established that the error of the determination of individual dyes by the absorbance subtraction method at isoabsorptive point is at the level of 1–3 % in model mixtures with different ratios of component concentrations. The percentage of the found dye content varied for E110 from 98.7 % to 101.2 %, for E124 – from 98.6 % to 99.2 %, for E102 – from 98.8 to 101.2 %. It was found that the error of determination of individual dyes by the proposed method is smaller than by the Firordt method.
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