Determination of Vitamin A in Fish Liver Oils with Activated Glycerol Dichlorohydrin

Determination of Carotene

“…This minimum coincides with the maximum for vitamin A, while the other maxima are almost at the minima for the vitamin. The green color is stable for 6 to 15 minutes, and the relationship between the concentration of carotene and light absorption at 550 mp obeys Beer's law (72). Above 630 mp the vitamin A color no longer absorbs light, whereas the carotene color continues absorbing light beyond this point.…”

Biochemical Changes in the Penicillin-Fed Chick

“…The aliquot was evaporated to dryness, taken up in chloroform and the colour developed with the acetic anhydridesulphuric acid mixture of Sperry and Brand (1943). Plasma carotenoid pigments and ascorbic acid were determined by the procedures of Sobel and Snow (1947) and Lowry et al (1945) respectively.…”

Medium Chain Triglycerides (MCT) in the Realimentation of Patients with Malabsorption: Nitrogen Balance, Composition of Faeces and Serum Lipoid Levels

“…The volume of urine was assessed daily and the nitrogen content was estimated by kjeldahlization. The csterified fatty acid serum level [39], cholesterol [32], ketone bodies [4], vitamin A [21] and beta carotene [38] were determined in 10 subjects who were on the same diet (butter and MCT) as during the balance study (two 7-10-day periods). The estimations were made on serum from blood collected in the morning on fasting, regularly twice a week in every period.…”