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
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- 作者：Ana Lozano ; 艁ukasz Rajski ; Samanta Ucl茅s ; Noelia Belmonte-Valles ; Milagros Mezcua ; Amadeo R. Fern谩ndez-Alba
- 关键词：Gas chromatography ; Mass spectrometry ; Multiresidue pesticide analysis ; Zirconium dioxide ; High oil matrices
- 刊名：Talanta
- 出版年：15 January, 2014
- 年：2014
- 卷：118
- 期：Complete
- 页码：68-83
- 全文大小：883 K
文摘
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 渭g/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.