Comparison of Disposable Pipette Extraction and Dispersive Solid-Phase Extraction in the QuEChERS Method for Analysis of Pesticides in Strawberries

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Virginia C Fernandes (Author) Other; Valentina F Domingues (Author) Other; Nuno Mateus (Author) FCUP; Cristina Delerue Matos (Author) Other

Journal

Title: Journal of Chromatographic Science

Vol. 52

Pages: 1339-1345

ISSN: 0021-9665

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 16 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-00A-5QP

DOI: 10.1093/chromsci/bmu003

Abstract (EN): In this study, we sought to assess the applicability of GC-MS/MS for the identification and quantification of 36 pesticides in strawberry from integrated pest management (IPM) and organic farming (OF). Citrate versions of QuEChERS (quick, easy, cheap, effective, rugged and safe) using dispersive solid-phase extraction (d-SPE) and disposable pipette extraction (DPX) for cleanup were compared for pesticide extraction. For cleanup, a combination of MgSO4, primary secondary amine and C18 was used for both the versions. Significant differences were observed in recovery results between the two sample preparation versions (DPX and d-SPE). Overall, 86% of the pesticides achieved recoveries (three spiking levels 10, 50 and 200 mu g/kg) in the range of 70-120%, with <13% RSD. The matrix effects were also evaluated in both the versions and in strawberries from different crop types. Although not evidencing significant differences between the two methodologies were observed, however, the DPX cleanup proved to be a faster technique and easy to execute. The results indicate that QuEChERS with d-SPE and DPX and GC-MS/MS analysis achieved reliable quantification and identification of 36 pesticide residues in strawberries from OF and IPM.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7