Abstract
An analytical method has been developed for the determination of five sterically hindered phenolic plastic additives in different edible oils. The procedure is based on thin-layer chromatography (TLC), after extraction of the additives from the matrix. The co-extracted oil components are eliminated by the use of pre-treated-silica plates. The additives are revealed according to the procedure developed by Boute and determined quantitatively by a monochromator TLC scanner. The detectable concentration of the individual antioxidants, in 5 g of the oil, ranges from 50 ppb 1 1 Throughout this article, the American billion (10 9) is meant. to 2 ppm, depending on the nature of the additive and the oil. The validity of the proposed method is based on investigations using sesame oil, safflower oil, sunflower oil, corn-germ oil and olive oil.
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