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Negative ion electrospray mass spectrometry of aminomethylphosphonic acid and glyphosate: elucidation of fragmentation mechanisms by multistage mass spectrometry incorporating in-source deuterium labelling

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JournalRapid Communications in Mass Spectrometry
DatePublished - 2004
Issue number1
Number of pages7
Pages (from-to)37-43
Original languageEnglish


Glyphosate and its main metabolite, aminomethylphosphonic acid, introduced by direct infusion in (H2O)-H-2, appear in negative ion electrospray mass spectrometry (ES-MS) as triply deuteriated [M-H](-) 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 (C) 2003 John Wiley Sons, Ltd.

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