title: Use of molecularly imprinted solid-phase extraction sorbent for the determination of four 5-nitroimidazoles and three of their metabolites from egg-based samples before tandem LC-ESIMS/MS analysis.
abstract: A nitroimidazole, molecularly imprinted polymer (MIP) was tested to extract four 5-nitroimidazoles (i.e., dimetridazole (DMZ), ipronidazole (IPZ), metronidazole (MNZ), and ronidazole (RNZ)) and three of their metabolites (i.e., DMZOH, IPZOH, and MNZOH) from egg powder samples. Various MIP templates were produced, and their selectivity was assessed on nitroimidazole standard solutions using liquid chromatography coupled with ultraviolet detection. The optimal cleanup was then used for the extraction of nitroimidazole in egg powder samples, and their quantification was achieved by isotope dilution LC-ESIMS/MS. The sample preparation entails a solubilization of the samples with water and acetonitrile followed by a MISPE cleanup step before LC-ESIMS/MS analysis. Data acquisition was achieved using selected reaction monitoring, and quantification was done with five deuterated analogues (i.e., DMZ- d(3), RNZ- d(3), IPZ- d(3), DMZOH- d(3), and IPZOH- d(3)). DMZOH- d(3) was used to quantify MNZ and MNZOH since they do not have their corresponding internal standards. The method was validated according to the European Union criteria by spiking experiments at concentration levels of 1, 2, and 3 microg/kg. At these three levels and for compounds having their own internal standards, acceptable performance data were obtained, with internal standard corrected recoveries ranging from 91 to 111%, and decision limits (CCalpha) and detection capabilities (CCbeta) were below 0.34 and 0.39 microg/kg, respectively.
authors.affiliation: Nestlé Research Center, Nestec Ltd., P.O. Box 44, Vers-Chez-Les-Blanc, 1000 Lausanne 26, Switzerland.
authors.forename: Rayane
authors.initials: R
authors.lastname: Mohamed
authors.forename: Pascal
authors.initials: P
authors.lastname: Mottier
authors.forename: Laureen
authors.initials: L
authors.lastname: Treguier
authors.forename: Janique
authors.initials: J
authors.lastname: Richoz-Payot
authors.forename: Ecevit
authors.initials: E
authors.lastname: Yilmaz
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Tabet
authors.forename: Philippe A
authors.initials: PA
authors.lastname: Guy
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003903:Deuterium; D054802:Molecular Imprinting; D009593:Nitroimidazoles / Q000032:analysis* / Q000378:metabolism*; D011108:Polymers / Q000737:chemistry; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry
chemical_list: D009593:Nitroimidazoles; D011108:Polymers; D003903:Deuterium; C052587:4-nitroimidazole