Pask-Hughes RA, Calam DH. Determination of vitamin D3 in cod-liver oil by high-performance liquid chromatography.
J Chromatogr A 1982;
246:95-104. [PMID:
6292246 DOI:
10.1016/s0021-9673(00)82786-7]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The present British Pharmacopoeia monograph for cod-liver oil requires a bioassay for the vitamin D3 content which is both time-consuming and complex. Alternative assays employing chromatographic procedures have been described but all these involve prior saponification of the oil. A selective extraction for vitamin D3 without the need for saponification is reported in this paper. The extraction utilizes only chromatographic assay using argentation on reversed-phase silica, with vitamin D2 as the internal standard. Reproducibility of injection gave a coefficient of variation of 0.6%, and repeatability of extraction for six samples gave a coefficient of variation of 6.8%.
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