title: Simultaneous determination of erythromycin propionate and base in human plasma by high-performance liquid chromatography-electrospray mass spectrometry.
abstract: An analytical method for simultaneous determination of erythromycin propionate and its active metabolite, erythromycin base, in human plasma by high-performance liquid chromatography-electrospray mass spectrometry (HPLC-ESI-MS) was developed and validated. Roxithromycin was selected as the internal standard. The samples were directly injected after simple deproteinized procedure only. The separation was achieved on a Johnson Spherigel analytical column packed with 5 microm C18 silica, employing acetonitrile -0.1% formic acid aqueous solution (50:50) as mobile phase. The quantification of target compounds was obtained by using a selected ion monitoring (SIM) at m/z 790.7 for erythromycin propionate, m/z 734.7 for erythromycin base and m/z 837.8 for roxithromycin. The correlation coefficients of the calibration curves were better than 0.997 (n=6), in the ranges from 2 ng/ml to 1 microg/ml, and from 1 to 10 microg/ml for erythromycin propionate and base. The method can provide the necessary sensitivity, precision and accuracy to allow the simultaneous determination of both compounds in a patient's plasma following a single administration of erythromycin stinoprate capsule (500 mg erythromycin base equivalent).
authors.affiliation: Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, Hunan Normal University, Changsha 410081, PR China.
authors.forename: Weitao
authors.initials: W
authors.lastname: Xiao
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
authors.forename: Zeneng
authors.initials: Z
authors.lastname: Cheng
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004917:Erythromycin / Q000031:analogs & derivatives* / Q000097:blood; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D004917:Erythromycin; C011807:erythromycin propionate