Summary
A sensitive method for the determination of hydroxymetabolites of vitamin D3, parficularly calcitriol (1,25-(OH)2-D3), in human plasma is reported. The method is based on the use of laser-induced fluorescence detection as an alternative to conventional fluorimetry in an integrated cleanup/preconcentration, HPLC separation and post-column derivatization system. The derivatization step is based on a dehydration reaction which takes place in secosteroid structures at high temperature in a strong-acid medium. A LOD of 0.01 pg mL−1 (SNR=3) was obtained for each analyte with a linear dynamic range over 4 order of magnitude with excellent regression coefficients (≥0.9922) in all cases. The precision was studied at two concentration levels and the RSDs values (for n=5) were acceptable (between 2.6 and 4.7%). The method was also checked by applying it to human plasma spiked with the target analytes and excellent recoveries were obtained. This is the first time that these species have been determined at the sub-pg mL−1 level.
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Ortiz Boyer, F., Fernández Romero, J.M., Luque de Castro, M.D. et al. Enhanced sensitivity by laser-induced fluorescence for the determination of calcitriol and other vitamin D3 metabolites in plasma. Chromatographia 50, 399–406 (1999). https://doi.org/10.1007/BF02490733
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DOI: https://doi.org/10.1007/BF02490733