title: Assessment of strobilurin fungicides' content in soya-based drinks by liquid micro-extraction and liquid chromatography with tandem mass spectrometry.
abstract: Seven strobilurin fungicides were pre-concentrated from soya-based drinks using dispersive liquid-liquid micro-extraction (DLLME) with a prior protein precipitation step in acid medium. The enriched phase was analysed by liquid chromatography (LC) with dual detection, using diode array detection (DAD) and electrospray-ion trap tandem mass spectrometry (ESI-IT-MS/MS). After selecting 1-undecanol and methanol as the extractant and disperser solvents, respectively, for DLLME, the Taguchi experimental method, an orthogonal array design, was applied to select the optimal solvent volumes and salt concentration in the aqueous phase. The matrix effect was evaluated and quantification was carried out using external aqueous calibration for DAD and matrix-matched calibration method for MS/MS. Detection limits in the 4-130 and 0.8-4.5 ng g(-1) ranges were obtained for DAD and MS/MS, respectively. The DLLME-LC-DAD-MS method was applied to the analysis of 10 different samples, none of which was found to contain residues of the studied fungicides.
authors.affiliation: a Department of Analytical Chemistry, Faculty of Chemistry , Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia , Murcia , Spain.
authors.forename: Natalia
authors.initials: N
authors.lastname: Campillo
authors.affiliation: a Department of Analytical Chemistry, Faculty of Chemistry , Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia , Murcia , Spain.
authors.forename: María Jesús
authors.initials: MJ
authors.lastname: Iniesta
authors.affiliation: a Department of Analytical Chemistry, Faculty of Chemistry , Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia , Murcia , Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Viñas
authors.affiliation: a Department of Analytical Chemistry, Faculty of Chemistry , Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia , Murcia , Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández-Córdoba
mesh_terms: D001628:Beverages / Q000032:analysis*; D002138:Calibration; D002853:Chromatography, Liquid; D005231:Fatty Acids, Unsaturated / Q000302:isolation & purification; D005233:Fatty Alcohols / Q000737:chemistry; D005659:Fungicides, Industrial / Q000302:isolation & purification*; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000379:methods; D008689:Methacrylates / Q000302:isolation & purification; D000432:Methanol / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013025:Glycine max / Q000737:chemistry*; D000073739:Strobilurins; D053719:Tandem Mass Spectrometry
chemical_list: D005231:Fatty Acids, Unsaturated; D005233:Fatty Alcohols; D005659:Fungicides, Industrial; D008689:Methacrylates; D012997:Solvents; D000073739:Strobilurins; C008556:mucidin; D000432:Methanol
keywords: dispersive liquid–liquid micro-extraction (DLLME); ion trap-tandem mass spectrometry (IT-MS/MS); liquid chromatography (LC); soya drinks; strobilurin fungicides