Disposable pipette extraction for the analysis of pesticides in fruit and vegetables using gas chromatography/mass spectrometry |
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Authors: | Hongxia Guan William E Brewer Sherry T Garris Stephen L Morgan |
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Institution: | 1. Department of Chemistry & Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA;2. South Carolina Department of Agriculture, 1101 Williams Street, Columbia, SC 29201, USA |
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Abstract: | 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) were determined to be lower than 0.1 μg/mL for all targeted pesticides in carrot and orange sample matrices. Coefficients of determination (r2) 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. |
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Keywords: | Disposable pipette extraction (DPX) Multiresidue pesticide analysis Fruits and vegetables Gas chromatography&ndash mass spectrometry QuEChERS |
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