Determination of phosmet and its metabolites in olives by matrix solid-phase dispersion and gas chromatography-mass spectrometry

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

Authors

Sara C Cunha (Author) Other; Jose O Fernandes (Author) FFUP; Beatriz, A (Author) Other; Oliveira, PP (Author) Other

Journal

Title: Talanta

Vol. 73 No. 3

Pages: 514-522

ISSN: 0039-9140

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 28 Citations

Scopus - 29 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-004-7E2

DOI: 10.1016/j.talanta.2007.04.014

Abstract (EN): An accurate method based on matrix solid-phase dispersion (MSPD), and gas chromatography-mass spectrometry (GC/MS) was developed for determination of phosmet residues and its metabolites (phosmet-oxon, phthalimide, N-hydroxymethylphthalimide, and phthalic acid) in olive fruits. After testing different sorbents and eluents for MSPD extraction, C(18) and acetonitrile were found to be the most appropriate for clean-up of the samples, in terms of yields and efficient removal of interfering compounds. All analytes were determined in selective ion monitoring (SIM) mode following a derivatization step with N,O-bis-trimethylsilyltrifluoroacetamide (BSTFA) containing 1% of trimethylchlorosilane (TMCS), except for phosmet and phosmet-oxon which were analyzed directly. The method showed suitable linearity (correlation coefficients higher than 0.8919 for all the compounds) and suitable sensitivity (limit of detection lower than 0.06 mg/kg). It was successfully applied in the analysis of olive fruits collected during the preharvest interval and olive oil. Phosmet residues found in all samples were lower than the maximum residue limits established by legislation (2 mg/kg).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9