Vitamin D and its metabolites in human and bovine milk

B. W. Hollis, B. A. Roos, H. H. Draper, P. W. Lambert

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Abstract

Human and bovine milk were analyzed for vitamin D, 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, 25,26-dihydroxyvitamin D and 1,25-dihydroxyvitamin D using exhaustive chromatographic purification procedures coupled with ligand binding assays. Human milk contained the following amounts of antirachitic sterols (pg/ml, mean ± SD, n=5); 39 ± 9 vitamin D; 311 ± 31 25-hydroxyvitamin D; 52 ± 8 24,25-dihydroxyvitamin D; 32 ± 9 25,26-dihydroxyvitamin D; 5.1 ± 0.3 1,25-dihydroxyvitamin D. Normal bovine milk contained levels of these sterols comparable to those found in human milk. Increasing the oral dose of vitamin D to the cows was reflected by an increase of the parent vitamin and 25-hydroxyvitamin D in the milk. Vitamin D-binding protein concentration in human milk whey, determined by Ouchterlony immuno-diffusion and radioimmunoassay, was 1-2% of the levels observed in the plasma and was dependent on the stage of lactation. Vitamin D and its metabolites were shown initially to be present in the whey portion but with time migrated into the fat portion of milk. The antirachitic sterols detected account for approximately 25 IU/liter and 27 IU/liter of antirachitic activity in human and bovine milk, respectively. In both species 25-hydroxyvitamin D comprised the majority of the antirachitic sterols detected in normal milk.

Original languageEnglish (US)
Pages (from-to)1240-1248
Number of pages9
JournalJournal of Nutrition
Volume111
Issue number7
StatePublished - Dec 1 1981

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ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

Cite this

Hollis, B. W., Roos, B. A., Draper, H. H., & Lambert, P. W. (1981). Vitamin D and its metabolites in human and bovine milk. Journal of Nutrition, 111(7), 1240-1248.