title: Determination of erythromycin concentrations in rat plasma and liver by high-performance liquid chromatography with amperometric detection.
abstract: A simple method for the quantitative determination of erythromycin (EM) concentrations in rat plasma and liver by high-performance liquid chromatography with amperometric detection was developed. EM was extracted from 200 microl of plasma or liver homogenate sample under sodium hydroxide alkaline conditions with tert.-butyl methyl ether. Oleandomycin was used as an internal standard. The recovery rate of EM was up to 100%. The detector cell potential for the oxidation of EM was +1100 mV. The calibration curves were linear over the concentration ranges 0.1-20.0 microg/ml for plasma and 0.5-100.0 microg/g for liver. The method was applied to the determination of the plasma and liver concentrations of EM in rats after intravenous administration (50 mg/kg dose). The method presented here has proved to be of great use for the investigation of the pharmacokinetic characteristics of EM in small animals such as rats.
authors.affiliation: Department of Pharmacy, The University of Tokyo Hospital, Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Hanada
authors.forename: H
authors.initials: H
authors.lastname: Ohtani
authors.forename: H
authors.initials: H
authors.lastname: Kotaki
authors.forename: Y
authors.initials: Y
authors.lastname: Sawada
authors.forename: T
authors.initials: T
authors.lastname: Iga
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004563:Electrochemistry; D004917:Erythromycin / Q000097:blood / Q000378:metabolism* / Q000493:pharmacokinetics; D008099:Liver / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity
chemical_list: D004917:Erythromycin