title: Advantages of molecularly imprinted polymers LC-ESI-MS/MS for the selective extraction and quantification of chloramphenicol in milk-based matrixes. comparison with a classical sample preparation.
abstract: A simple and fast selective extraction of the antibiotic chloramphenicol (CAP) from milk (raw milk, skimmed milk, and milk powder) using a molecularly imprinted polymer (MIP) sorbent is described. The method entails a single centrifugation step prior to loading the supernatant onto the MIP cartridge and subsequent elution with a mixture of solvents. CAP was further analyzed by isotope dilution liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) operating in negative ionization acquisition mode. The advantages of the MIP approach were assessed by comparing the data generated from a classical solid-phase and liquid-liquid extractions procedure, previously developed in our laboratory. A better recovery of CAP due to an enhanced selectivity and a faster turnaround time (18 samples processed within 3 h compared to 8 h with the classical approach) were evidenced when using the MIP cleanup. The analysis of CAP in raw milk was further validated according to the 2002/657/EC European Union criteria for the analysis of veterinary drug residues at the minimum required performance limit (MRPL) of 0.3 microg/kg, using CAP-d(5) as internal standard. Non-internal-standard corrected recovery values ranged between 50% and 87% over the range of concentrations considered. The decision limit (CCalpha) and detection capability (CCbeta) were calculated to be 0.06 and 0.10 microg/kg, respectively.
authors.affiliation: Nestlé Research Center, Nestec Limited, P.O. Box 44, Vers-Chez-Les-Blanc, 1000 Lausanne 26, Switzerland.
authors.forename: Rayane
authors.initials: R
authors.lastname: Mohamed
authors.forename: Janique
authors.initials: J
authors.lastname: Richoz-Payot
authors.forename: Eric
authors.initials: E
authors.lastname: Gremaud
authors.forename: Pascal
authors.initials: P
authors.lastname: Mottier
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: D000327:Adsorption; D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000302:isolation & purification; D002701:Chloramphenicol / Q000032:analysis / Q000302:isolation & purification*; D002853:Chromatography, Liquid; D008892:Milk / Q000737:chemistry*; D011108:Polymers; D012997:Solvents; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry / Q000379:methods* / Q000592:standards*
chemical_list: D000900:Anti-Bacterial Agents; D011108:Polymers; D012997:Solvents; D002701:Chloramphenicol