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FEBS Lett. 1985 Oct 28;191(2):171-5.

25-Hydroxyvitamin D3 3-sulphate is a major circulating form of vitamin D in man.


25-Hydroxyvitamin D3 3 beta-sulphate has been identified in human plasma. The compound was isolated by anion-exchange chromatography and following hydrolysis it was characterized by high-performance liquid chromatography and gas chromatography-mass spectrometry. The mean concentration of sulphated 25-hydroxyvitamin D3 in plasma from 60 patients was 16.7 +/- 7.1 ng/ml and the levels often exceeded those of the corresponding free compound. The study also shows that unconjugated 25-hydroxyvitamin D3 is not readily sulphated by man in vivo.

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