title: Enrofloxacin assay validation and pharmacokinetics following a single oral dose in chickens.
abstract: The pharmacokinetics of enrofloxacin (ENRO), a fluoroquinolone antimicrobial agent, was studied in male broiler chickens (Cobb) after single oral administration of 10 mg of ENRO/kg b.w. A high-performance liquid chromatography-photodiode array detector (DAD) (HPLC-DAD) method was developed and validated and used for quantitation of ENRO and its major metabolite ciprofloxacin in plasma. The HPLC analyses were carried out using a cationic-octadecyl mixed column and 0.05 mol/L phosphate buffer (pH 2.5)/acetonitrile as mobile phase. The sample preparation of plasma consisted of the precipitation of proteins followed by solid phase extraction on cationic-octadecyl mixed cartridges. The method was validated considering linear range, linearity, selectivity, sensitivity, limit of detection (LOD), limit of quantitation (LOQ), intra- and inter-day precisions and accuracy. The LOD and LOQ for both fluoroquinolones were 60 and 200 ng/mL for plasma. The plasma concentration vs. time graph was characteristic of a two-compartment open model. The maximal plasma concentration of 1.5 +/- 0.2 mg/mL was achieved at 9 +/- 2 h. The elimination half-life and the mean residence time of ENRO were 1.5 +/- 0.2 and 15.64 h, respectively. The area under the concentration-time curve was calculated as 35 +/- 4 mgxh/mL.
authors.affiliation: Department of Analytical Chemistry, Institute of Chemistry, State University of Campinas, Campinas, SP, Brazil.
authors.forename: R G
authors.initials: RG
authors.lastname: da Silva
authors.forename: F G R
authors.initials: FG
authors.lastname: Reyes
authors.forename: J R
authors.initials: JR
authors.lastname: Sartori
authors.forename: S
authors.initials: S
authors.lastname: Rath
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D019540:Area Under Curve; D002645:Chickens; D002851:Chromatography, High Pressure Liquid; D002939:Ciprofloxacin / Q000097:blood; D000077422:Enrofloxacin; D024841:Fluoroquinolones / Q000008:administration & dosage / Q000493:pharmacokinetics*; D006207:Half-Life; D008297:Male; D008657:Metabolic Clearance Rate
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D000077422:Enrofloxacin; D002939:Ciprofloxacin