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Biotransformation of the triketone herbicide mesotrione by a Bacillus strain. Metabolite profiling using liquid chromatography/electrospray ionization quadrupole time‐of‐flight mass spectrometry
Author(s) -
Durand Stéphanie,
Légeret Bertrand,
Martin AnneSophie,
Sancelme Martine,
Delort AnneMarie,
BesseHoggan Pascale,
Combourieu Bruno
Publication year - 2006
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2627
Subject(s) - chemistry , mesotrione , electrospray ionization , chromatography , metabolite , biotransformation , mass spectrometry , fragmentation (computing) , electrospray , liquid chromatography–mass spectrometry , quadrupole time of flight , organic chemistry , biochemistry , pesticide , enzyme , atrazine , computer science , agronomy , biology , operating system
Abstract The metabolic pathway involved in the biotransformation of the herbicide mesotrione by the bacterial strain Bacillus sp. 3B6 was investigated by a reliable liquid chromatography/electrospray ionization quadrupole time‐of‐flight mass spectrometry (LC/ESI‐QTOF‐MS) method. The LC/ESI‐MS method, both in positive and negative mode, with the assistance of MS 2 fragments and isotopic pattern analyses, allowed us to identify five metabolites. This work constitutes the first complete monitoring of mesotrione degradation kinetics. Among the transformation products found by both techniques, one was formed by intramolecular cyclization between a hydroxylamine and a keto function, which is quite a rare biological reactivity process. For each identified metabolite, a fragmentation pathway is proposed for negative and positive mode. Copyright © 2006 John Wiley & Sons, Ltd.