title: Liquid chromatography with diode array detection and tandem mass spectrometry for the determination of neonicotinoid insecticides in honey samples using dispersive liquid-liquid microextraction.
abstract: The combination of solid-phase extraction with dispersive liquid-liquid microextraction (SPE-DLLME) is proposed for the determination of five neonicotinoid insecticides in honey. After a cleanup stage, the analytes were eluted using acetonitrile. DLLME was performed by injecting rapidly the acetonitrile extract into 10 mL of water containing a 10% (w/v) NaCl and 100 μL of CHCl3. The settled organic phase obtained after centrifugation was evaporated, reconstituted in acetonitrile (ACN), and submitted to liquid chromatography (LC) with photodiode array detection (DAD) and atmospheric pressure chemical ionization-ion trap-tandem mass spectrometry (APCI-IT-MS/MS). The matrix effect was evaluated, and quantification was carried out using external aqueous calibrations when using DAD, the matrix-matched calibration method was applied for MS/MS. Detection limits in the 0.2-1.0 and 0.02-0.13 ng/g ranges were obtained when using DAD and MS/MS, respectively. The SPE-DLLME-LC-APCI-IT-MS/MS method was applied for the analysis of different honey samples, and none was found to contain residues.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia , E-30100 Murcia, Spain.
authors.forename: Natalia
authors.initials: N
authors.lastname: Campillo
authors.forename: Pilar
authors.initials: P
authors.lastname: Viñas
authors.forename: Gema
authors.initials: G
authors.lastname: Férez-Melgarejo
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández-Córdoba
mesh_terms: D000691:Anabasine / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods*; D006722:Honey / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D059627:Liquid Phase Microextraction / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D007306:Insecticides; D000691:Anabasine