title: Simultaneous determination of erythromycin ethylsuccinate and its metabolite erythromycin in human plasma using liquid chromatography-electrospray ionization mass spectrometry for clinical study.
abstract: A sensitive and selective liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) method was developed for simultaneous identification and quantification of erythromycin ethylsuccinate and erythromycin in human plasma, which can be well applied to clinical study. The method was based on liquid-liquid extraction, followed by a LC procedure with an ODS C18 column, and mixture of acetonitrile and 1.67 mmol/l acetic acid as mobile phase. MS detection was performed using a single quadrupole mass spectrometer in positive selected ion monitoring (SIM) mode. The method was validated to be linear, precise and accurate. The lower limit of quantification of erythromycin ethylsuccinate and erythromycin were both 0.5 ng/ml. The proposed method enables the unambiguous identification and quantification of erythromycin ethylsuccinate and erythromycin for clinical drug monitoring.
authors.affiliation: Key Laboratory of Pharmacokinetics and Drug Metabolism, China Pharmaceutical University, 1 Shennong Road, Nanjing City 210038, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Gu
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
authors.forename: Jianguo
authors.initials: J
authors.lastname: Sun
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D015643:Erythromycin Ethylsuccinate / Q000097:blood* / Q000493:pharmacokinetics; D006801:Humans; D007202:Indicators and Reagents; D008297:Male; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000900:Anti-Bacterial Agents; D007202:Indicators and Reagents; D015643:Erythromycin Ethylsuccinate