title: A fast and simple method for the determination of clavulanic acid in human plasma using derivatisation reaction kinetics.
abstract: A stopped-flow mixing technique is used to determine clavulanic acid in human plasma after plasma deproteinisation with acetonitrile and removal of the organic solvent by extraction with dichloromethane. The reaction kinetic profiles for the reaction between clavulanic acid and imidazole are determined by measuring the absorbance at 312 nm of the imidazole derivative. The reaction rates are proportional to the concentration of the clavulanic acid and by plotting reaction rates against clavulanic acid concentrations linear calibration curves could be constructed over the range 0.30-10.0 microg/ml.
authors.affiliation: FARMOVS Research Centre for Clinical Pharmacology and Drug Development, University of the Orange Free State, Bloemfontein, South Africa. gnfmhe@frm.uovs.ac.za
authors.forename: H
authors.initials: H
authors.lastname: Ellis
authors.forename: H K
authors.initials: HK
authors.lastname: Hundt
authors.forename: K J
authors.initials: KJ
authors.lastname: Swart
authors.forename: A F
authors.initials: AF
authors.lastname: Hundt
authors.forename: A L
authors.initials: AL
authors.lastname: Joubert
authors.forename: G H
authors.initials: GH
authors.lastname: van Essen
authors.forename: J B
authors.initials: JB
authors.lastname: Du Plessis
mesh_terms: D000900:Anti-Bacterial Agents / Q000097:blood*; D002138:Calibration; D019818:Clavulanic Acid / Q000097:blood*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007700:Kinetics; D011786:Quality Control; D015203:Reproducibility of Results; D012997:Solvents
chemical_list: D000900:Anti-Bacterial Agents; D007202:Indicators and Reagents; D012997:Solvents; D019818:Clavulanic Acid