title: Evolution of novel sorbents for effective clean-up of honeybee matrix in highly toxic insecticide LC/MS/MS analysis.
abstract: Highly toxic insecticides (HTIs) belonging to different chemical groups are dangerous to pollinating organisms, even in sublethal doses. An important objective of this study was to develop a method to determine over fifty HTIs at very low concentrations in the bee matrix. The novelty of this research involved obtaining extract completely free from beewaxes, lipids and proteins using EMR-lipid (enhanced matrix removal-lipid), chitin and Z-Sep+ (zirconium oxide and C18 dual-bonded to silica) as clean-up sorbents. Different parameters, such as weight of bees, extraction solvent, and freezing time were evaluated. Determinations were made using liquid chromatography-tandem mass spectrometry (LC-MS/MS). EMR-lipid allows for removing most of the fatty co-extracts and increases the overall performance of the method by reducing the matrix effects (ME) without significant analyte loss. The established modified QuEChERS method based on 1% acetic acid in acetonitrile extraction followed by EMR-lipid clean-up was validated at three different spiking levels (0.001, 0.01 and 0.1mgkg-1). Precision, calculated as relative standard deviation (RSD), was below 20%. The proposed method was used to determine sublethal doses of these insecticides in real samples of dead honeybees.
authors.affiliation: Plant Protection Institute - National Research Institute, Laboratory of Pesticide Residues, Chelmonskiego 22, 15-195 Bialystok, Poland. Electronic address: P.Kaczynski@iorpib.poznan.pl.
authors.forename: Piotr
authors.initials: P
authors.lastname: Kaczynski
authors.affiliation: Plant Protection Institute - National Research Institute, Laboratory of Pesticide Residues, Chelmonskiego 22, 15-195 Bialystok, Poland.
authors.forename: Izabela
authors.initials: I
authors.lastname: Hrynko
authors.affiliation: Plant Protection Institute - National Research Institute, Laboratory of Pesticide Residues, Chelmonskiego 22, 15-195 Bialystok, Poland.
authors.forename: Bozena
authors.initials: B
authors.lastname: Lozowicka
mesh_terms: D000097:Acetonitriles; D000818:Animals; D001516:Bees; D002853:Chromatography, Liquid / Q000379:methods; D003666:Decontamination / Q000379:methods; D007306:Insecticides / Q000032:analysis* / Q000633:toxicity; D010573:Pesticide Residues / Q000032:analysis* / Q000633:toxicity; D052616:Solid Phase Extraction / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D000097:Acetonitriles; D007306:Insecticides; D010573:Pesticide Residues; C032159:acetonitrile
keywords: EMR-lipid; Highly toxic insecticides; Honeybees; LC/MS/MS; QuEChERS; Sublethal doses