Compensation of matrix effects in seed matrices followed by gas chromatography-tandem mass spectrometry analysis of pesticide residues.

Compensation of matrix effects in seed matrices followed by gas chromatography-tandem mass spectrometry analysis of pesticide residues.

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Compensation of matrix effects in seed matrices followed by gas chromatography-tandem mass spectrometry analysis of pesticide residues.

J Chromatogr A. 2019 Nov 26;:460738

Authors: Rutkowska E, Łozowicka B, Kaczyński P

Abstract
Despite analytical advances, matrix effects (MEs) in pesticide residue analysis by gas chromatography – tandem mass spectrometry continue to be a challenge, especially in difficult samples such as seeds. In this study, the influence of different clean-up sorbents (chitin, chitosan, Z-Sep+, EMR-Lipid) and different mixtures of primary secondary amine (PSA), C18, graphitized carbon black (GCB) and MgSO4 were investigated in terms of MEs and recoveries in four types of seeds: cress, fennel, flax, and hemp. Additionally, different volumes of water (5, 7.5 and 10 mL) were investigated for QuEChERS extraction. Under the selected conditions: the largest volume of water (10 mL) and PSA/C18/GCB/MgSO4 (50/150/50/50 mg, respectively) as clean-up sorbent yielded acceptable recoveries of 70-120% for most of the pesticides (211-225 out of 248 compounds) and the lowest MEs were between -20%>MEs>20% (27-50 compounds). The final method was validated for 248 pesticides with LOQs equal to 0.005 mg kg-1. Additionally, matrix-matched calibration was used as a practical method to compensate for MEs. Among the 21 pesticides found in 12 of the samples, chlorpyrifos (0.008-1.1 mg kg-1), tebuconazole (0.071-0.96 mg kg-1), and trifloxystrobin (0.007-0.15 mg kg-1) were most commonly determined.

PMID: 31806271 [PubMed – as supplied by publisher]

Compensation of matrix effects in seed matrices followed by gas chromatography-tandem mass spectrometry analysis of pesticide residues.
https://www.ncbi.nlm.nih.gov/pubmed/31806271?dopt=Abstract

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=12OY-2YuXEtecDR7WE-A2c-rtPCJqs0e275YvMbwhvRR34bgib
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