title: Determination of chloramphenicol residues in milk, eggs, and tissues by liquid chromatography/mass spectrometry.
abstract: A new liquid chromatography/mass spectrometry (LC/MS) method is presented for the determination of chloramphenicol (CAP) residues in milk, eggs, chicken muscle and liver, and beef muscle and kidney. CAP is extracted from the samples with acetonitrile and defatted with hexane. The acetonitrile extracts are then evaporated, and residues are reconstituted in 10mM ammonium acetate--acetonitrile mobile phase and injected into the LC system. CAP is determined by reversed-phase chromatography using an Inertsil ODS-2 column and MS detection with negative ion electrospray ionization. Calibration curves were linear between 0.5-5.0 ng/g for all matrixes studied. The relative standard deviations for measurements by this method were generally <12%, and average recoveries ranged from 80 to 120%, depending on the matrix involved. The method detection limits of CAP ranged from 0.2 to 0.6 ng/g, which are comparable to previously reported results. The proposed method is rapid, simple, and specific, allowing a single analyst to easily prepare over 40 samples in a regular working day.
authors.affiliation: CANTEST Ltd.-Food Residue, 4606 Canada Way, Burnaby, British Columbia V5G IK5, Canada. anilmini@cantest.com
authors.forename: Lisa
authors.initials: L
authors.lastname: Penney
authors.forename: Anderson
authors.initials: A
authors.lastname: Smith
authors.forename: Brent
authors.initials: B
authors.lastname: Coates
authors.forename: Arosha
authors.initials: A
authors.lastname: Wijewickreme
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis*; D002138:Calibration; D002417:Cattle; D002645:Chickens; D002701:Chloramphenicol / Q000032:analysis*; D002853:Chromatography, Liquid; D004350:Drug Residues / Q000032:analysis*; D004531:Eggs / Q000032:analysis*; D007202:Indicators and Reagents; D013058:Mass Spectrometry; D008460:Meat / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D012015:Reference Standards; D015203:Reproducibility of Results; D012996:Solutions
chemical_list: D000900:Anti-Bacterial Agents; D007202:Indicators and Reagents; D012996:Solutions; D002701:Chloramphenicol