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Harir, M. ; Gáspár, A. ; Frommberger, M. ; Lucio, M. ; El Azzouzi, M.* ; Martens, D.* ; Kettrup, A.* ; Schmitt-Kopplin, P.

Photolysis pathway of imazapic in aqueous solution: ultrahigh resolution mass spectrometry analysis of intermediates.

J. Agric. Food Chem. 55, 9936-9943 (2007)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Direct degradation of imazapic, an herbicide of the imidazoline family, has been investigated in aqueous solution at different concentrations, pH values, and temperatures. The efficiency of the photodegradation process has been evaluated through degradation rate constants that could be fitted best with pseudo-first-order kinetics (Ct = C0 e–kt). Ultrahigh resolution mass spectrometry (FTICR/MS) was used in electrospray ionization mode as a tool to study the photolysis process on a molecular level, whereas UV–vis and high-performance liquid chromatography/mass spectrometry analysis were used to follow, by time, the evolution of the intermediates. Taking advantage of the high resolving power of FTICR/MS to perform precise formula assignments taking account of the natural abundance of isotopes, we herein propose and demonstrate an approach using 2D-derived van Krevelen visualization (O/C, H/C, m/z) to confirm the formation of imazapic intermediates. Such an approach allows a qualitative analysis of intermediates and elucidates the plausible reaction pathways of the photolysis process. More than eight photoproducts were separated and identified as a phototransformation of the imidazole ring. A mechanistical pathway was proposed.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter Photolysis; imazapic; kinetic; HPLC/MS; FTICR/MS; intermediates
ISSN (print) / ISBN 0021-8561
e-ISSN 1520-5118
Zeitschrift Journal of Agricultural and Food Chemistry
Quellenangaben Band: 55, Heft: 24, Seiten: 9936-9943 Artikelnummer: , Supplement: ,
Verlag American Chemical Society (ACS)
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit Analytical BioGeoChemistry (BGC)