title: [Determination of phenolic and salicylanilide anthelmintics in liquid milk by high performance liquid chromatography].
abstract: An analytical method for the determination of nitroxynil, oxyclozanide, closantel and rafoxanide in liquid milk by high performance liquid chromatography (HPLC) has been established. The milk sample was extracted with acetonitrile containing 1% (v/v) triethylamine. The supernatant was purified by an anion exchange solid phase extraction column. The analyte was detected by ultraviolet detector after the HPLC separation on a C18 RP column. The mobile phase was composed of acetonitrile-0.02 mol/L ammonium acetate solution with pH 4.0. The linear ranges of the four drugs in the spiked blank milk samples were 5-500 microg/kg, and the correlation coefficients were higher than 0.99. The limits of detection (LOD) were 3 microg/kg, and the limits of quantification (LOQ) were 5 microg/kg. The average recoveries and relative standard deviations (RSDs) of nitroxynil, oxyclozanide, closantel and rafoxanide at the spiked levels of 1/2MRL (maximum residue limit), MRL and 2MRL ranged from 92.20% to 96.13%, 5.55% to 16.30%; 87.40% to 94.74%, 5.40% to 12.21%; 86.97% to 91.09%, 2.67% to 8.17%; and 77.86% to 95.36%, 5.02% to 13.15% respectively. The method is simple and sensitive for the quantification of phenolic and salicylanilide anthelmintics in liquid milk.
authors.affiliation: National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Xianhui
authors.initials: X
authors.lastname: Huang
authors.affiliation: National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Changyan
authors.initials: C
authors.lastname: Yan
authors.affiliation: National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Xiangkai
authors.initials: X
authors.lastname: Kong
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D004350:Drug Residues / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D057230:Limit of Detection; D008892:Milk / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D012458:Salicylanilides / Q000032:analysis*; D052616:Solid Phase Extraction
chemical_list: D000871:Anthelmintics; D010636:Phenols; D012458:Salicylanilides