Hollis B W, Burton J H, Draper H H
Steroids. 1977 Aug;30(2):285-93. doi: 10.1016/0039-128x(77)90089-7.
The concentrations of the 25-hydroxy and 24R, 25-dihydroxy derivatives of vitamin D were determined in 100 microliter l plasma samples using calciferol binding globulin from bovine plasma. Sufficient quantities of 24R, 25-dihydroxy vitamin D were found in bovine, porcine, chicken and human plasma to interfere in the assay of 25-hydroxy vitamin D in unfractionated extracts. No metabolites of vitamin D could be found in rainbow trout plasma.
