Determinação espectrofotométrica de misturas de corantes em preparados sólidos de refrescos.

Abstract

The food industry has been using with great breadth additives in their products, among these we can highlight the dyes in order to provide, restore or enhance the color of food. On the other hand, the misuse of these products can have toxic effects, causing losses to consumer health. Thus, it is necessary to alert consumers to the conscious use of these products, and constant monitoring to check if the product is within the standards. There are fast and efficient methods for the detection, identification and quantification of these additives. One such method is spectrophotometry which presents a new, cheaper and high quality in terms of efficiency. The present work aims to quantify a mixture of dyes through the derivative method and compare it with the methodology of mixture analysis of chromophores. The following tests were carried out: Determination of the absorption spectrum, determining the specific absorptivity, determined by the mixture of chromophores classic method, determination of the curve using the method Yellow; concentrations of dyes in solid preparations, the calibration methods consistency and classical derivative, meet with some values above those recommended by the legislation.and Tartrazine Yellow Twilight solids prepared by classical methods determinin derivative the concentration of a mixture of chromophores and determining the method of derivative; g and derivative. The results show that the absorption spectra of the tartrazine yellow dye and Twilight correspond to maximum intensity of absorption; the calibration curves (R2), the dyes for the TA and CA wavelengths 407nm and 463nm. The average recovery of AT dye was 98.6%, whereas the dye BC was 99.2%, being satisfactory, the technique derived by the method showed good consistency in the results, the concentrations of dyes in solid preparations by the classical method and derivatives, are consistent with those recommended by the legislation and labeling of products as well. Were observed on product labels only the dye AT and AC.