title: Determination of 10 sulfonamide residues in meat samples by liquid chromatography with ultraviolet detection.
abstract: A liquid chromatography (LC) method is described for the simultaneous determination of 10 commonly used sulfonamide drug residues in meat. The 10 sulfonamide drugs of interest were sulfadiazine, sulfathiazole, sulfamerazine, sulfadimidine, sulfamethizole, sulfamonomethoxine, sulfachloropyridazine, sulfadoxine, sulfadimethoxine, and sulfaquinoxaline. The residues were extracted with acetone-chloroform (1 + 1). Sulfonamides were quantitatively retained in the extracting solution and afterwards eluted from a cation-exchanger solid-phase extraction cartridge with a solution of methanol-aqueous ammonia. The solution was dried, reconstituted with 5 mL methanol and filtered before analysis by LC-ultraviolet using a C18 column with a mobile phase gradient of potassium dihydrogen phosphate buffer, pH 2.5, and methanol-acetonitrile (30 + 70, v/v). The method was applied to cattle, swine, chicken, and sheep muscle tissues. The validation was performed with a fortified cattle meat sample at level of 100 ppb, which is the administrative maximum residue limit for sulfonamides in the European Union. The limit of quantitation for all sulfonamides was between 3 and 14 ppb. Recovery was evaluated for different meat matrixes. The mean recovery values were between 66.3% for pork meat samples and 71.5% for cattle meat samples.
authors.affiliation: University of Bologna, Department of Pharmaceutical Sciences, via Belmeloro 6, 40126 Bologna, Italy.
authors.forename: Marcello
authors.initials: M
authors.lastname: Di Sabatino
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Di Pietra
authors.forename: Luigi
authors.initials: L
authors.lastname: Benfenati
authors.forename: Bruno
authors.initials: B
authors.lastname: Di Simone
mesh_terms: D000818:Animals; D002417:Cattle; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002645:Chickens; D002853:Chromatography, Liquid / Q000379:methods*; D004350:Drug Residues / Q000032:analysis*; D005506:Food Contamination; D006863:Hydrogen-Ion Concentration; D008460:Meat; D008956:Models, Chemical; D009132:Muscles / Q000378:metabolism; D010710:Phosphates / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012756:Sheep; D013449:Sulfonamides / Q000032:analysis* / Q000737:chemistry*; D013552:Swine; D014466:Ultraviolet Rays
chemical_list: D010710:Phosphates; D017680:Potassium Compounds; D013449:Sulfonamides; C013216:potassium phosphate