Elucidating collision induced dissociation products and reaction mechanisms of protonated uracil by coupling chemical dynamics simulations with tandem mass spectrometry experiments

Abstract : 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.
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Journal of Mass Spectrometry, Wiley-Blackwell, 2015, 50 (12), pp.1340-1351. 〈10.1002/jms.3704〉
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Dernière modification le : jeudi 22 novembre 2018 - 13:56:13

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Estefania Rossich-Molina, Daniel Ortiz, Jean-Yves Salpin, Riccardo Spezia. Elucidating collision induced dissociation products and reaction mechanisms of protonated uracil by coupling chemical dynamics simulations with tandem mass spectrometry experiments. Journal of Mass Spectrometry, Wiley-Blackwell, 2015, 50 (12), pp.1340-1351. 〈10.1002/jms.3704〉. 〈hal-01224902〉

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