Collision-induced dissociation studies of caffeine in positive electrospray ionisation mass spectrometry using six deuterated isotopomers and one N1-ethylated homologue
作者:Dirk Bier、Rudolf Hartmann、Marcus Holschbach
DOI:10.1002/rcm.6520
日期:2013.4.30
In order to deepen the understanding of electrosprayionisation collision‐induced dissociation (ESI‐CID) fragmentation reactions of xanthine derivatives for the identification of metabolites using low‐resolution liquid chromatography/massspectrometry (LC/MS) analysis, basic experiments usingcaffeine (1,3,7‐trimethylxanthine) as model compound have been performed.
Multi-deuterium incorporations into drugs, such as theophylline, caffeine, valpromide, phenytoin, and trimethoprim, were post-synthetically achieved by Pd/C-, Pt/C-, or/and Rh/C-catalyzed hydrogen–deuterium exchange reactions under neutral conditions using deuterium oxide as the deuterium source in the presence of hydrogen gas. The present study offers facile and convenient methods for the preparation of highly deuterated medicines, which are expected to be used as long-lasting medicines as well as internal standards for metabolic studies and for the quantitative analyses of the parent drugs.