Gas chromatography-isotope dilution mass spectrometry method validation for target pesticides in soybeans. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Huertas-Pérez, J. F.; Sejerøe-Olsen, B.; Gokcen, T.; Sandor, F.; Schimmel, H.; Dabrio, M.
• Is Part Of: Food additives & contaminants. Volume 36:Issue 1(2019)
• Page Start: 96
• Page End: 108
• Publication Date: 2019-01-02
• Subjects: Pesticide -- method development and validation -- soybeans -- gas chromatography -- isotopic dilution-mass spectrometry -- uncertainty; Food additives -- Periodicals; Food contamination -- Periodicals; 664.06
• DOI: 10.1080/19440049.2018.1538571
• Languages: English
• ISSNs: 1944-0049

Abstract

ABSTRACT: The production of certified reference materials requires the application of highly accurate methods for characterisation. A gas chromatography-isotope dilution mass spectrometry method, setting ambitious performance criteria, was developed for eight selected pesticides in soybeans. Pressurised liquid extraction was followed by automated gel-permeation chromatography and solid-phase extraction clean-up. Pesticides identification respected a Commission Decision and guidelines of the Directorate General for Health and Food Safety (DG SANTE). Reliable quantification involved stable isotopically labelled analogues as internal standards. Validation, according to ISO/IEC 17, 025 and DG SANTE guidelines, assessed linearity, LOD/LOQ, trueness, selectivity, precision, stability and robustness. Mean recoveries ranges (83–109%, relative standard deviations < 3%), repeatability (2.2–4.8%), day-to-day variation (0.6–4.2%) and combined uncertainty (1.2–4.2%) were fit for purpose. The method is highly accurate and suitable for certification of the selected pesticides in soybean matrix reference material. Chemical compounds studied in this article: Diazinon (PubChem CID: 3017); malathion (PubChem CID: 4004); chlorpyrifos (PubChem CID: 2730); captan (PubChem CID: 8606); endosulfan (PubChem CID: 3224); tebuconazole (PubChem CID: 86, 102); iprodione (PubChem CID: 37, 517); cypermethrin (PubChem CID: 2912). Graphical Abstract: