Journal
JOURNAL OF MASS SPECTROMETRY
Volume 50, Issue 12, Pages 1340-1351Publisher
WILEY
DOI: 10.1002/jms.3704
Keywords
nucleobase fragmentation; collision induced dissociation; retro Diels Alder; gas-phase reaction mechanisms; chemical dynamics simulations
Funding
- ANR [ANR-14-CE06-0029-01]
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In this study we have coupled mixed quantum-classical (quantum mechanics/molecular mechanics) direct chemical dynamics simulations with electrospray ionization/tandem mass spectrometry experiments in order to achieve a deeper understanding of the fragmentation mechanisms occurring during the collision induced dissociation of gaseous protonated uracil. Using this approach, we were able to successfully characterize the fragmentation pathways corresponding to ammonia loss (m/z 96), water loss (m/z 95) and cyanic or isocyanic acid loss (m/z 70). Furthermore, we also performed experiments with isotopic labeling completing the fragmentation picture. Remarkably, fragmentation mechanisms obtained from chemical dynamics simulations are consistent with those deduced from isotopic labeling. Copyright (c) 2015 John Wiley & Sons, Ltd.
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