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Vitamin D metabolism is actively modulated in adipose tissue during obesity. To better investigate this process, we develop a specific LC-HRMS/MS method that can simultaneously quantify three vitamin D metabolites, i.e., cholecalciferol, 25-hydroxyvitamin D 3 (25(OH)D 3 ), and 1,25-dihydroxyvitamin D 3 (1,25(OH) 2 D 3 ) in a complex matrix, such as mouse adipose tissue and plasma. The method uses pretreatment with liquid-liquid or solid-phase extraction followed by derivatization using Amplifex ® reagents to improve metabolite stability and ionization efficiency. Here, the method is optimized by co-eluting stable isotope-labelled internal standards to calibrate each analogue and to spike biological samples. Intra-day and inter-day relative standard deviations were 0.8-6.0% and 2.0-14.4%, respectively for the three derivatized metabolites. The limits of quantification (LoQ) achieved with Amplifex ® derivatization were 0.02 ng/mL, 0.19 ng/mL, and 0.78 ng/mL for 1,25(OH) 2 D 3 , 25(OH)D 3 and cholecalciferol, respectively. Now, for the first time, 1,25(OH) 2 D 3 can be co-quantified with cholecalciferol and 25(OH)D 3 in mouse adipose tissue. This validated method is successfully applied to study the impact of obesity on vitamin D status in mice.

Simple Fast Quantification of Cholecalciferol, 25-Hydroxyvitamin D and 1,25-Dihydroxyvitamin D in Adipose Tissue Using LC-HRMS/MS