Four Derivative Spectrophotometric Methods for the Simultaneous Determination of Carmoisine and Ponceau 4R in Drinks and Comparison with High Performance Liquid Chromatography

Table 1

Experimental parameters calculated for the simultaneous determination of Carmoisine and Ponceau 4R in binary mixture by compensation method.

Colorants	Concentration range (µg mL^−1)	Ratio	Mean^a	RSD (%)
Carmoisine	2–10	^1D472/^1D569	0.600 ± 0.002	0.333
Ponceau 4R	2–10	^1D470/^1D554	0.690 ± 0.009	1.304

aMean of five separate determinations.