Journal
FOOD CHEMISTRY
Volume 127, Issue 3, Pages 1300-1308Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.01.087
Keywords
Fruits and vegetables; Pesticides; Microwave-assisted extraction (MAE); Dispersive solid-phase extraction (d-SPE); Method validation; Gas chromatography-mass spectrometry
Funding
- State Grading Laboratory, Directorate of Agricultural Marketing, Delhi, India
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A rapid, effective and ecofriendly method for sensitive screening and quantification 01 72 pesticides residue in fruits and vegetables, by microwave-assisted extraction (MAE) followed by dispersive solid-phase extraction (d-SPE), retention time locked (RTL) capillary gas-chromatographic separation in trace ion mode mass spectrometric determination has been validated as per ISO/IEC: 17025:2005. Identification and reporting with total and extracted ion chromatograms were facilitated to a great extent by Deconvolution reporting software (DRS). For all compounds LOD were 0.002-0.02 mg/kg and LOQ were 0.025-0.100 mg/kg. Correlation coefficients of the calibration curves in the range of 0.025-0.50 mg/kg were >0.993. To validate matrix effects repeatability, reproducibility, recovery and overall uncertainty were calculated for the 35 matrices at 0.025, 0.050 and 0.100 mg/kg. Recovery ranged between 72% and 114% with RSD of <20% for repeatability and intermediate precision. The reproducibility of the method was evaluated by an inter laboratory participation and Z score obtained within +/- 2. (C) 2011 Elsevier Ltd. All rights reserved.
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