Collision??induced dissociation studies of caffeine in positive electrospray ionisation mass spectrometry using six deuterated isotopomers and one N1??ethylated …
…, R Hartmann, M Holschbach
文献索引：Bier, Dirk; Hartmann, Rudolf; Holschbach, Marcus Rapid Communications in Mass Spectrometry, 2013 , vol. 27, # 8 p. 885 - 895
METHODS Six deuterium isotopomers and one N1-ethylated homologue of caffeine have been synthesized and their ESI fragmentation spectra have been obtained by using LC/MS in combination with either standard or perdeuterated eluent mixtures. RESULTS One result of these studies is the finding that the positive charges of the ESI-CID caffeine fragments are caused by the addition of protons. Furthermore, the performed experiments allow the ...
