S. Sayar et Y. Ozdemir, DETERMINATION OF PONCEAU 4R AND TARTRAZINE IN VARIOUS FOOD SAMPLES BYDERIVATIVE SPECTROPHOTOMETRIC METHODS, Turkish journal of chemistry, 21(3), 1997, pp. 182-187
Derivative spectrophotometric methods were originally developed for de
termining Ponceau 4R and Tartrazine in order to resolve their binary m
ixtures. The method permits the simultaneous determinations of these f
ood colorants in various food samples. Recovery by derivative methods
was nearly 100 %.