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

Table 5

Dye concentrations in real samples determined by UV/VIS spectrophotometry or SPE followed by TLC/densitometry.

	Dye	UV/VIS	TLC/densitometry			TLC/densitometry
			Day 1, Analyst 1			Day 2, Analyst 2
		Dye content; µgmL^−1	Dye content; µgmL^−1	CV [%]	Recovery [%]	Dye content; µgmL^−1	CV [%]	Recovery [%]
Blue mouthwash	E133	8.6	7.7	2.23	89.5	7.8	3.62	90.7
Red mouthwash	E124	28.0	26.0	1.02	92.3	25.6	1.89	91.4