title: Matrix effects in pesticide multi-residue analysis by liquid chromatography-mass spectrometry.
abstract: Three sample preparation methods: Luke method (AOAC 985.22), QuEChERS (quick, easy, cheap, effective, rugged and safe) and matrix solid-phase dispersion (MSPD) were applied to different fruits and vegetables for analysis of 14 pesticide residues by high-performance liquid chromatography with electrospray ionization-mass spectrometry (HPLC/ESI/MS). Matrix effect, recovery and process efficiency of the sample preparation methods applied to different fruits and vegetables were compared. The Luke method was found to produce least matrix effect. On an average the best recoveries were obtained with the QuEChERS method. MSPD gave unsatisfactory recoveries for some basic pesticide residues. Comparison of matrix effects for different apple varieties showed high variability for some residues. It was demonstrated that the amount of co-extracting compounds that cause ionization suppression of aldicarb depends on the apple variety as well as on the sample preparation method employed.
authors.affiliation: Institute of Chemistry, University of Tartu, Jakobi 2, 51014 Tartu, Estonia.
authors.forename: Anneli
authors.initials: A
authors.lastname: Kruve
authors.forename: Allan
authors.initials: A
authors.lastname: Künnapas
authors.forename: Koit
authors.initials: K
authors.lastname: Herodes
authors.forename: Ivo
authors.initials: I
authors.lastname: Leito
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005638:Fruit / Q000737:chemistry; D027845:Malus / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis*; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D010573:Pesticide Residues