Disposable pipette extraction for the analysis of pesticides in fruit and vegetables using gas chromatography/mass spectrometry

Organochlorine, organophosphate pesticides and fungicides In fruits and vegetables were analyzed using disposable pipette extraction (DPX) followed by gas chromatography-mass spectrometry-selective ion monitoring (GC/MS-SIM) The intrinsic rapid mixing capabilities of DPX result in fast and efficient extractions. and eluates are concentrated by using minimal elution solvent volumes rather than solvent evaporation methods Matrix-matched calibrations were performed with reversed phase mechanisms (DPX-RP). and the limits of detection (LOD) wet e determined to be lower than 0.1 mu g/mL for all targeted pesticides in carrot and orange sample matrices Coefficients of determination (r(2)) were greater than 0.995 for most studied pesticides DPX-RP exhibited recoveries between 72 and 116% for nonpolar and slightly polar pesticides (log P>2) with most of the recoveries over 88% Only very polar pesticides (e g. acephate, mathamidophos) were not extracted well using DPX-RP (C) 2010 Elsevier B V All rights reserved