title: Evaluation of the combination of micellar electrokinetic capillary chromatography with sweeping and cation selective exhaustive injection for the determination of 5-nitroimidazoles in egg samples.
abstract: A methodology is presented for the sensitive determination of nitromidazole residues in egg by means of micellar electrokinetic capillary chromatography in combination with cation selective exhaustive injection and ultraviolet detection. Six compounds have been considered and the separation has been achieved in less than 12min in a 61.5-cm effective length capillary with 50-μm internal diameter. Phosphate buffer 44mM pH 2.5, containing 8% tetrahydrofurane and 123mM sodium dodecyl sulfate was employed as running buffer. Solid phase extraction has been employed for sample clean-up. The methodology has been successfully validated in hen eggs, obtaining method detection limits in the range of 2.1-5.0ng/g. Precision was studied in terms of repeatability and intermediate precision, with relative standard deviations lower than 18.0%. Recoveries were calculated in quail eggs and a commercial pasteurized egg white product, reaching over 70% for most of the considered 5-nitroimidazoles.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain.
authors.forename: Diego
authors.initials: D
authors.lastname: Airado-Rodríguez
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain.
authors.forename: Maykel
authors.initials: M
authors.lastname: Hernández-Mesa
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain.
authors.forename: Ana M
authors.initials: AM
authors.lastname: García-Campaña
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain. Electronic address: mcruces@ugr.es.
authors.forename: Carmen
authors.initials: C
authors.lastname: Cruces-Blanco
mesh_terms: D000818:Animals; D002645:Chickens; D020374:Chromatography, Micellar Electrokinetic Capillary; D004531:Eggs / Q000032:analysis*; D005504:Food Analysis; D057230:Limit of Detection; D009593:Nitroimidazoles / Q000032:analysis*; D011784:Quail; D015203:Reproducibility of Results; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D052616:Solid Phase Extraction
chemical_list: D009593:Nitroimidazoles; D012967:Sodium Dodecyl Sulfate; C052587:4-nitroimidazole
keywords: 5-Nitroimidazoles; Cation selective exhaustive injection; Egg samples; Micellar electrokinetic capillary chromatography