Quantification of vitamin D2, vitamin D3, and the monohydroxy and diihydroxy metabolites of vitamin D2 and vitamin D3, can comprise labeling analytes with mass spectrometry (MS) tagging reagents and performing LC-MSMS analysis of the labeled analytes. The labeled analytes can include a labeled standard and can have distinct retention times on a reversed phase column, as well as distinct masses. Under high energy collisions, reporter groups can be generated. The intensity or the peak area detected for each reporter group can be used for quantitation. In some embodiments, a one-step tagging reagent is used that is a dienophile-containing, labeled m Diels Alder reagent.
维生素D2、
维生素D3以及
维生素D2和
维生素D3的单羟基和双羟基代谢产物的定量可以包括使用质谱(MS)标记试剂标记分析物并对标记的分析物进行LC-MSMS分析。标记的分析物可以包括标记的标准,并在反相柱上具有不同的保留时间和不同的质量。在高能碰撞下,可以生成报告组。检测到的每个报告组的强度或峰面积可用于定量分析。在某些实施例中,使用一步标记试剂,该试剂是含有双烯酰基的标记的二烯基阿尔德试剂。