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Simultaneous Determination of Vitamin D Metabolites 25(OH)D and 1α,25(OH)D in Human Plasma Using Liquid Chromatography Tandem Mass Spectrometry

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Specialty General Medicine
Date 2022 May 16
PMID 35572785
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Abstract

Background: Although measurement of 25(OH)D is a routine analytical method to determine plasma vitamin D status, 1α,25(OH)D is the biologically active form. Hence, simultaneous measurement of 25(OH)D and 1α,25(OH)D could provide better insight into vitamin D status and pharmacokinetics. However, 1α,25(OH)D has a low plasma concentration, making its quantification challenging for most analytical techniques. Here, we demonstrate use of liquid chromatography tandem mass spectrometry (LC-MSMS) for the development of a simple and rapid method for the simultaneous quantification of 25(OH)D and 1α,25(OH)D.

Methods: Samples were purified from 250 µL human plasma. Chromatography was performed on an analytical column, under gradient conditions using a mobile phase consisting of methanol-lithium acetate. The mass detector was operated in positive multiple reaction monitoring mode. The established method was validated according to the guidance issued by ICH and FDA. Furthermore, a clinical study was performed using this method to detect the plasma concentrations of 1α,25(OH)D after oral administration of calcitriol.

Results And Conclusion: The method was acceptably linear over the concentration ranges of 20-1200 pg/mL for 1α,25(OH)D and 1-60 ng/mL for 25(OH)D, respectively, with correlation coefficients of r > 0.993. Both the inter-assay and intra-assay precision was < 15%, and the analytical recoveries were within 100% ± 10%, with no significant matrix effect or carryover. Thereby, we, provide a facile method for the simultaneous detection of vitamin D metabolites in plasma.

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