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Monitoring pesticide residues in greenhouse tomato by combining acetonitrile-based extraction with dispersive liquid–liquid microextraction followed by gas-chromatography–mass spectrometry
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Orientador(es)
Resumo(s)
A multiclass and multiresidue method for pesticide analysis in tomato was validated. Extraction and preconcentration
of the pesticide residues from acetonitrile extracts was performed by using dispersive
liquid–liquid microextraction (DLLME) technique, followed by gas chromatography–mass detection.
DLLME was performed using carbon tetrachloride as extractive solvent and acetonitrile extract as dispersive
solvent, in order to increase enrichment factor of the extraction procedure. Validation parameters
indicated the suitability of the method for routine analyses of thirty pesticides in a large number of samples.
In general, pesticide recoveries ranged between 70% and 110% and repeatability ranged between 1%
and 20%. The proposed method was applied to the monitoring of pesticides in tomatoes grown during
winter in greenhouses. Among the compounds considered in this work, cyprodinil was found in tomato
at concentrations of 0.33 mg/kg, other pesticides like azoxystrobin, fenhexanid, tolyfluanid, k-cyhalothrin
and trifloxystrobin were also detected, but, not quantified.
Descrição
Palavras-chave
Tomato Pesticides Improved Extraction Procedure Dispersive Liquid–liquid Microextraction Gas Chromatography–mass Detection Água e Solo
Contexto Educativo
Citação
Food Chem. 2012 Dec 1;135(3):1071-7. Epub 2012 Jun 7.