Journal
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
Volume 19, Issue 15, Pages 2193-2202Publisher
WILEY-BLACKWELL
DOI: 10.1002/rcm.2036
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The structural elucidation of by-products arising from carbofuran photodegradation using a high-pressure UV lamp has been investigated by liquid chromatography/electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) employing a quadrupole time-of-flight mass spectrometer. Exact mass measurements of the [M+H](+) ions of the by-products and of product ions allowed the elemental formulae and related structures of seven photodegradation by-products (resulting, respectively, from photo-Fries rearrangement, hydroxylation of the benzene ring, oxidation of the 2,3-dihydrobenzofuran ring, cleavage of the carbamate group, hydrolysis of the ether group and the newly observed radical coupling and decarboxylation processes) to be determined confidently. Accurate mass measurements of product ions allowed ambiguities to be removed concerning neutral losses having the same nominal mass, namely CO and C(2)H(4), allowing the fragmentation patterns to be rationalized. Copyright (c) 2005 John Wiley & Sons, Ltd.
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