Uvitex OB 2,5-bis 5-tert butyl-2-benzoxazolyl thiophene in Aqueous Extractants

1 Uvitex OB (2,5-bis 5 -tert butyl-2-benzoxazolyl)thiophene) in Aqueous Extractants 

The determination of Uvitex OB illustrates an example of the application of ultraviolet spectroscopy to the determination of additives in foodstuff simulent extraction liquids. 

Extraction liquids can contain a mixture of extracted substances, and one method of applying spectroscopy in these cases is to apply a correction procedure. This can be demonstrated by considering the extractant from a polystyrene formulation containing, in addition to Uvitex OB, Wingstay, butyl stearate and mineral oil. 

Uvitex OB 5 0.052 The presence of Santonex R at this level would not cause more than 10% error in the determination of Uvitex OB at 378 nm 

Uvitex OB 5 0.05 Optical density at 378 nm due to Uvitex OB is less than 3% of the optical density due to interference at 378 nm by all the other migrated polymer additives present. Uvitex cannot be determined under these conditions. 

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