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Immunoassays for 1α,25-dihydroxyvitamin D [1α,25(OH)(2)D] lack analytical specificity. We characterized the cross-reactivity of an anti-1α,25(OH)(2)D antibody with purified vitamin D metabolites and used these data to map the chemical features of 1α,25(OH)(2)D that are important for antibody binding. Additionally, we hypothesized that when combined with isotope-dilution liquid chromatography-tandem mass spectrometry (LC-MS/MS), antibody cross-reactivity could be used to semiselectively enrich for structurally similar metabolites of vitamin D in a multiplexed assay.

clinical chemistry

Characterizing Antibody Cross-reactivity for Immunoaffinity Purification of Analytes prior to Multiplexed Liquid Chromatography–Tandem Mass Spectrometry