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Determination of pesticides in edible oils by liquidchromatography-tandem mass spectrometry employing newgeneration materials for dispersive solid phase extraction clean-up.

Jonatan V. Diasa, Victor Cutillasb, Ana Lozanob, Ionara R. Pizzuttia,Amadeo R. Fernández-Albab

aFederal University of Santa Maria (UFSM), Chemistry Department, Center of Research and Analysis of Residues and Contaminants (CEPARC), 97105-900,Santa Maria, RS, Brazil

bEuropean Union Reference Laboratory for Pesticide Residues in Fruit & Vegetables (EURL-FV), University of Almeria, Agrifood Campus of InternationalExcellence (ceiA3), Almeria, Spain

Journal of Chromatography A, 1462 (2016) 8–18

http://dx.doi.org/10.1016/j.chroma.2016.07.072

Abstract 

The goal of this work was to evaluate the efficiency of several sorbents on removal fats from edible oils(olive, soya and sunflower) during the clean-up step for posterior determination of 165 pesticides byUHPLC-QqQ-MS/MS system. The extraction procedure employed in this work was the citrate version ofQuEChERS method followed by a step of freezing out with dry ice and clean-up evaluation using i) PSAwith magnesium sulfate (d-SPE); ii) magnesium sulfate and Z-sep sorbent (d-SPE); iii) Z-sep (columnSPE) and iv) Agilent Bond Elut QuEChERS Enhanced Matrix Removal-Lipid (EMR-Lipid). After evaluationof the recovery results at 10, 20 and 50 g kg−1, the EMR-Lipid showed important advantages comparingto the other sorbents evaluated, such as better recovery rates and RSD%. The method was validated atthe three concentrations described above. Analytical curves linearity was evaluated by spiking blank oilsamples at 10, 20, 50, 100 and 500 g kg−1. The method demonstrated good recoveries values betweenthe acceptable range of 70–120% and RSD% < 20 for most of evaluated pesticides. In order to evaluate theperformance of the method, this same procedure was employed to other oils such as soya and sunflowerwith very good results.

© 2016 Elsevier B.V. All rights reserved.

 

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Published 05-12-2016, 10:47:15

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