Quantification of the 3α and 3β epimers of 25-hydroxyvitamin D3 in dried blood spots by LC-MS/MS using artificial whole blood calibration and chemical derivatization

While the biological function of the 3 alpha epimer of 25-hydroxyvitamin D-3 (25(OH)D-3) remains unknown, its presence needs to be accurately captured and separated from the main 3 beta epimer, to avoid positive bias in vitamin D status analyses. Several recent LC-MS/MS assays for 25(OH)D-3 successfully separate the 3 alpha and 3 beta epimers by chromatography. Unfortunately, none of the existing LC-MS/MS assays, which utilize dried blood spots (DBS) as sampling/storage vessels, is able to quantify the individual epimers. DBS are often used for analysis of infant blood, however, and these samples are particularly likely to contain significant levels of interfering 3 alpha epimer. Furthermore, proper calibration of DBS samples is much more difficult to achieve than for liquid serum or plasma samples. We addressed this important issue by creating an artificial vitamin D-free whole blood for calibration and then quantified 3 alpha- and 3 beta-25(OH)D-3 levels from DBS. After chemical derivatization, the vitamin D epimers were separated on a PFP column and concentrations determined by electrospray ionization LC-MS/MS on a triple quadrupole mass spectrometer. Calibration with artificial whole blood showed improved precision over standard addition (7.6 versus 31.5% RSD for 3 beta-25(011)D3). The limits of quantification for 3 beta-25(011)D-3 and for 3 alpha-25(OH)D-3 were 1.0 and 0.1 ng/mL, respectively. Excellent intra/ interday precisions between 2.1 and 2.2% CV (intra) and 4.4-5.3% CV (inter) were established for 3P-25(OH) D3 and 3 alpha-25(OH)D3. For 3 beta-25(OH)D-3, only small concentration -independent bias and deviation of < 3.3 ng/ mL were seen between serum LC-MS/MS and DBS-LC-MS/MS measurements; analyses of 3 alpha-25(OH)D-3 showed deviations of < 0.8 ng/mL in all experiments.