title: Quantitative determination of azithromycin in human plasma by ultra performance liquid chromatography-electrospray ionization mass spectrometry and its application in a pharmacokinetic study.
abstract: A selective, rapid and sensitive ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed for the quantitative determination of azithromycin in human plasma and its application in a pharmacokinetic study. With roxithromycin as internal standard, sample pretreatment involved a one-step extraction with diethyl ether of 0.5 mL plasma. The analysis was carried out on an ACQUITY UPLC BEH C(18) column (50 mm x 2.1 mm, i.d., 1.7 microm) with gradient elution at flow rate of 0.35 mL/min. The mobile phase was 50 mM ammonium acetate and acetonitrile. The detection was performed on a triple-quadrupole tandem mass spectrometer by multiple reaction monitoring (MRM) mode via electrospray ionization (ESI). Linear calibration curves were obtained in the concentration range of 1-1000 ng/mL, with a lower limit of quantification of 1 ng/mL. The intra- and inter-day precision (RSD) values were below 15% and accuracy (RE) was -1.3% to 5.7% at all QC levels. The method was applicable to clinical pharmacokinetic study of azithromycin in healthy volunteers following oral administration.
authors.affiliation: Department of Analytical Chemistry, Shenyang Pharmaceutical University, Shenyang, PR China.
authors.forename: Lingyun
authors.initials: L
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Qin
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Ma
authors.forename: Famei
authors.initials: F
authors.lastname: Li
mesh_terms: D000900:Anti-Bacterial Agents / Q000097:blood* / Q000302:isolation & purification / Q000493:pharmacokinetics; D017963:Azithromycin / Q000097:blood* / Q000302:isolation & purification / Q000493:pharmacokinetics; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000900:Anti-Bacterial Agents; D017963:Azithromycin