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Pesticide testing in foodstuffs is a challenging application for mass spectrometry (MS), since it implies simultaneous trace analysis of hundreds of compounds belonging to a many classes, preferably undertaken in one fast run. The appearance and the use of new, more polar pesticides has prompted the use of liquid chromatography electrospray ionization MS (LC-ESI-MS) instead of gas chromatography....
Column liquid chromatography (LC) with pneumatically assisted electrospray (PA-ESP) or atmospheric pressure chemical ionization (APCI) followed by (tandem) mass spectrometry (MS or MS-MS) was used for the analysis of a test mixture of 17 pesticides. In order to achieve low-ng/l detection limits, solid-phase extraction (SPE) of a 100-ml aqueous sample on a small cartridge packed with a hydrophobic...
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