title: High performance liquid chromatographic determination of azithromycin in serum using fluorescence detection and its application in human pharmacokinetic studies.
abstract: A fast and sensitive high-performance liquid chromatographic method for determination of azithromycin in human serum using fluorescence detection was developed. The drug and an internal standard (clarithromycin) were extracted from serum using n-hexan and subjected to pre-column derivatization with 9-fluorenylmethyl chloroformate as labeling agent. Analysis was performed on a phenyl packing material column with sodium phosphate buffer containing 2 ml/l triethylamine (pH 5.9) and methanol (29:71, v/v) as the mobile phase. The standard curve was linear over the range of 10-500 ng/ml of azithromycin in human serum. The means between-days precision were from 13.3% (for 10 ng/ml) to 2% (500 ng/ml) and the within-day precision from 11.9 to 1.7% determined on spiked samples. The accuracy of the method was 100.7-107.2% (between days) and 100.3-107.8% (within day). The limit of quantification was 10 ng/ml. This method was applied in a bioequivalence study of four different azithromycin preparations in 12 healthy volunteers.
authors.affiliation: Medical Biology Research Center, Medical School, Kermanshah University of Medical Sciences, Kermanshah 20155, Iran. gbahrami@kums.ac.ir
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Bahrami
authors.forename: Shahla
authors.initials: S
authors.lastname: Mirzaeei
authors.forename: Amir
authors.initials: A
authors.lastname: Kiani
mesh_terms: D000900:Anti-Bacterial Agents / Q000097:blood* / Q000493:pharmacokinetics; D017963:Azithromycin / Q000097:blood* / Q000493:pharmacokinetics; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013810:Therapeutic Equivalency
chemical_list: D000900:Anti-Bacterial Agents; D017963:Azithromycin