Evaluation of the QuEChERS sample preparation approach for the analysis of pesticide residues in olives

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Sara C Cunha (Author) Other; Steven J Lehotay (Author) Other; Katerina Mastovska (Author) Other; Jose O Fernandes (Author) FFUP; Maria Beatriz P P Oliveira (Author) FFUP; Oliveira, PP (Author) Other

Journal

Title: Journal of Separation Science

Vol. 30 No. 4

Pages: 620-632

ISSN: 1615-9306

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 167 Citations

ISI Web of Science

Scopus - 195 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

CORDIS: Health sciences

Other information

Authenticus ID: P-004-BJP

DOI: 10.1002/jssc.200600410

Resumo (PT): This paper describes the use of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for extraction and cleanup of 16 pesticide residues of interest in olives and olive oil. These products contain a high lipid content, which can adversely affect pesticide recoveries and harm traditional chromatographic systems. For extraction, the main factors (oil and water content) were studied and optimized in experiments to maximize pesticide recoveries. Dispersive SPE with different sorbents was also investigated to minimize matrix coextractives and interferences. For analysis, a new automated DSI device was tested in GC-MS to avoid nonvolatile coextractives from contaminating the instrument. LC-MS/MS with positive ESI was used for those pesticides that were difficult to detect by GC-MS. The final method was validated for olives in terms of recoveries, repeatabilities, and reproducibilities using both detection techniques. The results demonstrated that the method achieved acceptable quantitative recoveries of 70-109% with RSDs <20% for DSI-GC-MS and 88-130% with RSDs <10% for LC-MS/MS, and LOQ at or below the regulatory maximum residue limits for the pesticides were achieved. <br> <br> Keywords: Direct sample introduction • Gas chromatography-mass spectrometry • Liquid chromatography-tandem mass spectrometry • Multiresidue pesticide analysis • Olive oil <br> <a target="_blank" href="http://www3.interscience.wiley.com/journal/114175435/abstract"> Texto integral </a> <br> <br>

Abstract (EN): This paper describes the use of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for extraction and cleanup of 16 pesticide residues of interest in olives and olive oil. These products contain a high lipid content, which can adversely affect pesticide recoveries and harm traditional chromatographic systems. For extraction, the main factors (oil and water content) were studied and optimized in experiments to maximize pesticide recoveries. Dispersive SPE with different sorbents was also investigated to minimize matrix coextractives and interferences. For analysis, a new automated DSI device was tested in GC-MS to avoid nonvolatile coextractives from contaminating the instrument. LC-MS/MS with positive ESI was used for those pesticides that were difficult to detect by GC-MS. The final method was validated for olives in terms of recoveries, repeatabilities, and reproducibilities using both detection techniques. The results demonstrated that the method achieved acceptable quantitative recoveries of 70-109% with RSDs < 20% for DSI-GC-MS and 88-130% with RSDs < 10% for LC-MS/MS, and LOQ at or below the regulatory maximum residue limits for the pesticides were achieved.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13