Negative ion electrospray mass spectrometry of aminomethylphosphonic acid and glyphosate: elucidation of fragmentation mechanisms by multistage mass spectrometry incorporating in-source deuterium labelling
- 16 December 2003
- journal article
- research article
- Published by Wiley in Rapid Communications in Mass Spectrometry
- Vol. 18 (1) , 37-43
- https://doi.org/10.1002/rcm.1264
Abstract
Glyphosate and its main metabolite, aminomethylphosphonic acid, introduced by direct infusion in 2H2O, appear in negative ion electrospray mass spectrometry (ES‐MS) as triply deuteriated [MH]− ions. Sites of deuterium residence and loss were established using the multistage (MSn) capabilites of an ion trap mass spectrometer to assist in the determination of fragmentation mechanisms. The study reveals specific mechanisms, common to each analyte, such as those involving a five‐membered transition state between the amine and phosphonate group, as well as analyte specific transitions. Copyright © 2003 John Wiley & Sons, Ltd.Keywords
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