Analyses of selected non-authorized insecticides in peppers by gas chromatography/mass spectrometry and gas chromatography/tandem mass spectrometry
Mezcua, M., Ferrer, C. , García-Reyes, J.F. , Martínez-Bueno, M.J. , Sigrist, M. , Fernández-Alba, A.R.
Food Chemistry 112 (2009) 221-225
Author Keywords
Food; Gas chromatography; Insecticides; Mass spectrometry; Pesticides
Abstract
Two methods based on gas chromatography coupled with mass spectrometry and tandem mass spectrometry analyzers are described for the identification, confirmation and quantitation of two EU-banned insecticides: isocarbophos and isofenphos-methyl, detected in recent monitoring programmes in pepper samples. The proposed methodologies involved a liquid-liquid extraction with acetonitrile followed by a cleanup step by dispersive solid-phase extraction using primary-secondary amine as sorbent material. Recovery studies performed on peppers spiked at different fortification levels (10 and 50 μg kg-1) yielded average recoveries in the range 85-98% with RSD values below 8%. Identification, confirmation and quantitation were carried out by gas chromatography/mass spectrometry (GC-MS) in selected ion monitoring mode and gas chromatography/tandem mass spectrometry (GC-MS/MS) using an ion trap operating in the multiple reaction monitoring (MRM) mode. The obtained limits of detection (LODs) were in the range 0.1-0.3 μg kg-1, depending on the technique. The proposed methods were successfully applied to the analysis of suspected pepper samples.
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Published 11-12-2008, 11:03:37
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