A Survey of Vitamin A and D Contents of Fortified Fluid Milk in Ontario

摘要

High performance liquid chromatographic methods for measuring the concentration of vitamins A and D in fluid milk were validated and used to assess the level of these nutrients in Ontario retail milk samples. Thirteen and fifteen fortified milk samples were tested for vitamins A and D, respectively. Repeatability rela- tive standard deviation values for vitamins A and D in milk were generally less than 10/100. Recoveries varied from 87 to 107/100. Vitamin D results indicated that only 20/100 of skim, 40/100 of 2/100 fat milk, and 20/100 of whole milk contained the recommended levels, whereas 46/100 of skim, and 77/100 of 2/100 fat milk had the required levels of vitamin A. The results indicate that vitamin level varies widely in Ontario retail milk.