Determination and Comparative Study of Sugars and Synthetic Colorants in Commercial Branded Fruit Juice Products

Table 3

Behavior of standard synthetic colors on TLC with n-butanol : water : glacial acetic acid (20 : 12 : 10 v/v) solvent system.

Color standard	Rf value	Color of the spot
Carmosine	0.79	Dark strawberry red
Ponceau 4R	0.47	Strawberry red
Fast red E	0.67	Dark red
Ponceau S	0.39	Strawberry red
Allura red	0.70	Orange red
Sunset yellow	0.74	Orange
Tartrazine	0.55	Lemon yellow
Metanil yellow	0.87	Yellow
Sudan 1	0.95	Light yellow
Sudan 2	0.94	Light orange
Sudan 3	0.93	Light orange
Sudan 4	0.93	Light red