Collision??induced dissociation studies of caffeine in positive electrospray ionisation mass spectrometry using six deuterated isotopomers and one N1??ethylated …

…, R Hartmann, M Holschbach

Index: Bier, Dirk; Hartmann, Rudolf; Holschbach, Marcus Rapid Communications in Mass Spectrometry, 2013 , vol. 27, # 8 p. 885 - 895

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Citation Number: 5

Abstract

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 ...