A survey of vitamin A and D contents of fortified fluid milk in Ontario.
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 relative standard deviation values for vitamins A and D in milk were generally less than 10%. Recoveries varied from 87 to 107%. Vitamin D results indicated that only 20% of skim, 40% of 2% fat milk, and 20% of whole milk contained the recommended levels, whereas 46% of skim, and 77% of 2% fat milk had the required levels of vitamin A. The results indicate that vitamin level varies widely in Ontario retail milk.
Faulkner
H
H
Laboratory Services Division, University of Guelph, ON, Canada. hfaulkner@lsd.uoguelph.ca
Hussein
A
A
Foran
M
M
Szijarto
L
L
D000818:Animals; D002170:Canada; D002853:Chromatography, Liquid / Q000379:methods; D005527:Food, Fortified / Q000592:standards*; D006801:Humans; D008892:Milk / Q000737:chemistry* / Q000592:standards; D015203:Reproducibility of Results; D014801:Vitamin A / Q000032:analysis*; D014807:Vitamin D / Q000032:analysis*
D014801:Vitamin A; D014807:Vitamin D