SPE/TLC/Densitometric Quantification of Selected Synthetic Food Dyes in Liquid Foodstuffs and Pharmaceutical Preparations

Table 3

Regression coefficients () with confidence intervals. Analytical wavelengths selected on the basis of densitometric scanning (Figure 2).

	(95%, 10)	(95%, 10)	(95%, 10)		LOQ
					µgspot^−1
Orange yellow				0.9978	0.09
Azorubine				0.9992	0.08
Brilliant Blue				0.9993	0.06
Ponceau 4R				0.9982	0.07
Tartrazine				0.9971	0.04