Website-Security by IONOS.

Determination of pesticide residues in high oil vegetal commodities by using various multi-residue methods and clean-ups followed by liquid chromatography tandem mass spectrometry

Łukasz Rajski, Ana Lozano, Ana Uclés, Carmen Ferrer, Amadeo R. Fernández-Alba

Journal of Chromatography A, 1304 (2013) 109– 120

DOI: http://dx.doi.org/doi:10.1016/j.chroma.2013.06.070


Several extraction methods were evaluated in terms of recoveries and extraction precision for 113 pesticides in avocado: QuEChERS with various d-SPE clean-ups (Z-Sep, Z-Sep+, PSA+C18 and silica), miniLuke and ethyl acetate. Extracts were analysed using liquid chromatography coupled with triple quadrupole mass spectrometer working in multi-reaction monitoring mode. Z-Sep and Z-Sep+ are new types of material for high lipid matrices - these two sorbents contain ZrO2, which improves fat removal from the extracts. The QuEChERS protocol with Z-Sep provided the highest number of pesticides with recoveries in the 70-120% range along with the lowest amount of coextracted matrix compounds. Subsequently, this method was validated in two matrices - avocado and almonds. In the validation recoveries at two levels - 10 and 50 μg/kg - limit of quantitation, linearity, matrix effects, as well as the inter- and intraday precision were studied. In the avocado samples, 107 analytes had LOQs equal to 10 μg/kg (signal to noise of quantitative transition was equal 20 or more). In the almond samples, 92 pesticides had LOQs equal to 10 μg/kg (S/N ≥ 20) and 2 pesticides at 50 μg/kg. The validated method was employed in the analysis of real avocado and almond samples.

Copyright © 2013 Elsevier B.V. All rights reserved.


If you want to obtain the full text document, please contact with us:

Octavio Malato: omalato@ual.es (+34) 950 214 423

Carmen Ferrer: cferrer@ual.es (+34) 950 014 102


Published 10-07-2013, 15:14:04


Share: LinkedIn. Share it via Email.

Top of Page