title: Sensitive and specific method for the determination of josamycin in human plasma by liquid chromatography-mass spectrometry.
abstract: A highly sensitive and specific method for the determination of josamycin in human plasma by LC-MS was developed and validated. Josamycin was extracted from human plasma by a single-step liquid-liquid extraction and analyzed by LC-MS via an electrospray ionization interface. Selected ion monitoring was used to detect josamycin and its internal standard. The intra-day precision and accuracy, expressed as C.V. and R.E., ranged from 2.8% to 13.5% and -10.3% to 7.6%, respectively. The lower limit of detection was 0.1 ng/ml and the lower limit of quantitation was set at 1 ng/ml when 0.5 ml of plasma was used. No endogenous interference was observed in human plasma obtained from drug-free volunteers.
authors.affiliation: Drug Metabolism Laboratories, Yamanouchi Pharmaceutical Co., Ltd., Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kikuchi
authors.forename: T
authors.initials: T
authors.lastname: Teramura
authors.forename: J
authors.initials: J
authors.lastname: Sekino
authors.forename: T
authors.initials: T
authors.lastname: Nishimura
authors.forename: H
authors.initials: H
authors.lastname: Miura
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: S
authors.initials: S
authors.lastname: Higuchi
mesh_terms: D000900:Anti-Bacterial Agents / Q000097:blood*; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D015570:Josamycin / Q000097:blood*; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000900:Anti-Bacterial Agents; D015570:Josamycin