title: [Determination of cefalonium residue in milk by high performance liquid chromatography-tandem mass spectrometry].
abstract: An analytical method was developed for the determination of cefalonium in milk by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). A total of 1 g milk was deproteinized by acetonitrile. The supernatant was transferred into a test tube to be blown dry with N2 at 37 degrees C. Then the residue was dissolved with methanol-0.1% formic acid in water (3:7, v/v). The sample was determined by HPLC-MS/MS after the purification. The chromatographic separation was achieved on a C18 column using 0.1% formic acid in water and acetonitrile as mobile phases with gradient elution. Qualitative and quantitative analyses were achieved by HPLC-MS/MS under positive ionization and multiple reaction monitoring (MRM) mode. Matrix-matched calibration curve was used for the quantification. Good correlation coefficients were obtained (r > 0. 999) in the mass concentration range of 2-200 microg/L. The limit of detection (LOD, S/N > or = 3) was 0.5 microg/kg in milk, and the limit of quantification (LOQ, S/N 10) was 2 microg/kg. The mean recoveries at the four levels of LOQ, 1/2MRL (maximum residue level), MRL, 2MRL were between 78.5% and 86.2%, with the intra-day relative standard deviations (RSDs) of 1.5% to 6.2% and inter-day RSDs of 2.9% to 5.6%. In conclusion, the established method can be applied for the determination of cefalonium residue in milk.
authors.forename: Shuaipeng
authors.initials: S
authors.lastname: Li
authors.forename: Chunna
authors.initials: C
authors.lastname: Guo
authors.forename: Lei
authors.initials: L
authors.lastname: Meng
authors.forename: Xianhui
authors.initials: X
authors.lastname: Huang
mesh_terms: D000818:Animals; D002511:Cephalosporins / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D004350:Drug Residues / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D053719:Tandem Mass Spectrometry
chemical_list: D002511:Cephalosporins