UHPLC Analysis Of Vitamin D2 & D3

Analysis of vitamin D metabolites has continued to be a topic of interest in recent publications, primarily as biomarkers for possible disease states and vitamin deficiency. While vitamin D is present in two forms, vitamin D3 and vitamin D2, current ELISA methods demonstrate different cross-reactivities and cannot distinguish between D2 and D3 forms of the vitamin metabolites resulting in erroneous reporting of total 25-hydroxyvitamin D concentrations.

Further, there is interest in an analytical means to differentiate the D2 and D3 forms from the D2 and D3 epimers because of their different degrees of bioactivity. Here, we demonstrate the use of the Supel™ Carbon LC UHPLC column, with its ability to resolve structural isomers, to baseline separate all four analytes.