Spectrophotometric determination of some preservatives in milk.
Benzoic acid, propyl p-hydroxybenzoate, and sorbic acid in milk have been determined by using the corresponding first derivative curves of absorption spectra of clarified milk samples. The delta A/delta lambda curves were computed and the concentration of each preservative was calculated using 1 point, 2 points, and/or 3 points. In all cases, the percentage error was within 2.4%.
D000818:Animals; D002417:Cattle; D005520:Food Preservatives / Q000032:analysis*; D008892:Milk / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods
D005520:Food Preservatives