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Individual quantitation of vitamin D2, vitamin D3, 25-hydroxyvitamin D2, and 25-hydroxyvitamin D3 in human milk

✍ Scribed by Bruce W. Hollis

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 753 KB
Volume: 131
Category: Article
ISSN: 0003-2697
DOI: 10.1016/0003-2697(83)90157-4

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✦ Synopsis

Extraction, lipid-reduction, and chromatographic methods suitable for the resolution and subsequent quantitation of vitamin D2, vitamin D3, 25-hydroxyvitamin D2, and 25-hydroxy-vitamin D3 from human milk are described. This procedure utilizes a methanol:methylene chloride extraction, precipitation of unwanted lipids with cold methanol and ether, backwash with alkaline buffer, silica Sep-Pak preparative chromatography, normal- and reverse-phase high-performance liquid chromatography with final quantitation of the antirachitic sterols by competitive protein binding assay. The described assay was used to determine these antirachitic sterols in milk from women receiving various supplements of vitamin D or undergoing ultraviolet phototherapy.

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