Abstract
A liquid chromatography/electrospray ionization-tandem mass spectrometry (LC/ESI–MS/MS) method was developed using a new Cookson-type reagent, 4-[4-(1-pipelidinyl)phenyl]-1,2,4-triazoline-3,5-dione (PIPTAD), to analyze the monoglucuronides (Gs) of vitamin D3 metabolites in human urine. The G of 23S,25-dihydroxyvitamin D3 [23,25(OH)2D3] was previously found as a major metabolite of vitamin D3 in the urine, but its conjugation position remained undetermined. Determination of the position was an important research issue to clarify the whole picture of the excretion of surplus 25-hydroxyvitamin D3 [25(OH)D3, the circulating form of vitamin D3] in humans. After the pretreated urine sample was derivatized with PIPTAD, the peak corresponding to the G of 23,25(OH)2D3 was satisfactorily separated from the urine-derived interfering substances on reversed-phase LC, which could not be achieved by using the previous analogous reagent, DAPTAD. The PIPTAD-derivatized Gs of the vitamin D3 metabolites provided characteristic product ions useful for identifying the conjugation positions during the MS/MS. Accordingly, we successfully determined the glucuronidated position of 23,25(OH)2D3 to be the C23-hydroxy group. The developed method also enabled the simultaneous detection of Gs of 25(OH)D3 and 24R,25-dihydroxyvitamin D3 as well as 23,25(OH)2D3-23-G without interference from the urine components.
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This study was supported in part by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 20K06990.
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Takada, K., Ogawa, S., Yoshida, N. et al. Separation and identification of monoglucuronides of vitamin D3 metabolites in urine by derivatization-assisted LC/ESI–MS/MS using a new Cookson-type reagent. ANAL. SCI. 39, 1053–1063 (2023). https://doi.org/10.1007/s44211-023-00350-4
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DOI: https://doi.org/10.1007/s44211-023-00350-4