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  • Evaluation of zirconium dioxide-based sorbents to decrease the matrix effect in avocado and almond multiresidue pesticide analysis followed by gas chromatography tandem mass spectrometry.

Evaluation of zirconium dioxide-based sorbents to decrease the matrix effect in avocado and almond multiresidue pesticide analysis followed by gas chromatography tandem mass spectrometry.

Talanta (2013-11-28)
Ana Lozano, Łukasz Rajski, Samanta Uclés, Noelia Belmonte-Valles, Milagros Mezcua, Amadeo R Fernández-Alba
ABSTRACT

Two sorbents containing ZrO₂ (Z-Sep and Z-Sep+) were tested as a d-SPE clean-up in combination with the QuEChERS and ethyl acetate multiresidue method in the pesticide residues extraction in avocado. All extracts were analysed using gas chromatography coupled with a triple quadrupole mass spectrometer working in multi-reaction monitoring mode. GC QToF was used to compare the amount of matrix compounds present in the final extracts, prepared according to different protocols. The highest number of pesticides with acceptable recoveries and the lowest amount of coextracted matrix compounds were provided by QuEChERS with Z-Sep. Subsequently, this method was fully validated in avocado and almonds. Validation studies were carried out according to DG Sanco guidelines including: the evaluation of recoveries at two levels (10 and 50 μg/kg), limit of quantitation, linearity, matrix effects, as well as interday and intraday precision. In avocado, 166 pesticides were fully validated compared to 119 in almonds. The method was operated satisfactorily in routine analysis and was applied to real samples.

MATERIALS
Product Number
Brand
Product Description

Supelco
Supel QuE, Z-Sep+ Tube, pk of 50, centrifuge tube volume 15 mL , Shaker Compatible
Supelco
Supel QuE, Z-Sep/C18 Tube, pk of 50, centrifuge tube volume 15 mL , Shaker Compatible
Supelco
Supel QuE, Z-Sep Tube, pk of 50, centrifuge tube volume 15 mL , Shaker Compatible
Supelco
Supel QuE, Z-Sep with MgSO4 Tube, pk of 50, centrifuge tube volume 15 mL , Shaker Compatible
Supelco
Supel QuE, Z-Sep+ with MgSO4 Tube, pk of 50, centrifuge tube volume 15 mL , Shaker Compatible
Supelco
Supel QuE, Z-Sep Tube, centrifuge tube volume 2 mL, pack of 100 ea
Supelco
Supel QuE, Z-Sep+ with MgSO4 Tube, centrifuge tube volume 2 mL, pack of 100 ea
Supelco
Supel QuE, Z-Sep with MgSO4 Tube, centrifuge tube volume 12 mL, pack of 50 ea
Supelco
Supel QuE, Z-Sep+ with MgSO4 Tube, centrifuge tube volume 12 mL, pack of 50 ea
Supelco
Supel QuE, Z-Sep+ Tube, centrifuge tube volume 2 mL, pack of 100 ea
Supelco
Supel QuE, Z-Sep Bulk
Supelco
Supel QuE, Z-Sep/C18 Tube, centrifuge tube volume 2 mL, pack of 100
Supelco
Supel QuE, Z-Sep+ Bulk, pkg of 20 g