title: Comprehensive gas chromatography coupled to mass spectrometry for the separation of pesticides in a very complex matrix.
abstract: The present research is focused on the development of a comprehensive two-dimensional gas chromatography-rapid scanning quadrupole mass spectrometric (GC x GC-qMS) methodology for the analysis of trace-amount pesticides contained in a complex real-world sample. Reliable peak assignment was carried out by using a recently developed, dedicated pesticide MS library (for comprehensive GC analysis), characterized by a twin-filter search procedure, the first based on a minimum degree of spectral similarity and the second on the interactive use of linear retention indices (LRI). The library was constructed by subjecting mixtures of commonly used pesticides to GC x GC-qMS analysis and then deriving their pure mass spectra and LRI values. In order to verify the effectiveness of the approach, a pesticide-contaminated red grapefruit extract was analysed. The certainty of peak assignment was attained by exploiting both the enhanced separation power of dual-oven GC x GC and the highly effective search procedure.
authors.affiliation: Dipartimento Farmaco-chimico, Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy. lmondello@pharma.unime.it
authors.forename: Luigi
authors.initials: L
authors.lastname: Mondello
authors.forename: Alessandro
authors.initials: A
authors.lastname: Casilli
authors.forename: Peter Quinto
authors.initials: PQ
authors.lastname: Tranchida
authors.forename: Maria
authors.initials: M
authors.lastname: Lo Presti
authors.forename: Paola
authors.initials: P
authors.lastname: Dugo
authors.forename: Giovanni
authors.initials: G
authors.lastname: Dugo
mesh_terms: D032083:Citrus paradisi / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010573:Pesticide Residues / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D010573:Pesticide Residues