Recebido em 17/1/05; aceito em 22/7/05; publicado na web em 13/1/06 DERIVATIVE SPECTROPHOTOMETRY: A SIMPLE STRATEGY FOR SIMULTANEOUS DETERMINATION OF FOOD DYES. A very simple spectrophotometric method is described for resolving binary mixture of the food colorants Sunset Yellow (INS 110) and Tartrazine Yellow (INS 102) by using the first derivative spectra with measurements at zero-crossing wavelengths. Before the spectrophotometric measurements, the dyes were sorbed onto polyurethane foam and recovered in … Show more
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