title: Interlaboratory study of the analysis of benzylpenicillin by liquid chromatography.
abstract: A liquid chromatography method for analysis of benzylpenicillin was examined in a collaborative study involving seven laboratories. The method comprised an isocratic part, which is used in the assay. The isocratic part corresponds to the assay method for benzylpenicillin used by a manufacturer. When the isocratic part is combined with gradient elution, the method is suitable for purity control. Five samples of benzylpenicillin (sodium and potassium salts) were analysed. The main component and the impurities were determined. An analysis of variance proved the absence of consistent laboratory bias. The laboratory-sample interaction was not significant. Estimates for the repeatability and reproducibility of the method, expressed as standard deviations (S.D.) of the result of the determination of benzylpenicillin, were calculated to be 0.71 and 0.80, respectively.
authors.affiliation: Laboratorium voor Farmaceutische Chemie en Analyse van Geneesmiddelen, K.U. Leuven, Belgium.
authors.forename: Z
authors.initials: Z
authors.lastname: Yongxin
authors.forename: E
authors.initials: E
authors.lastname: Roets
authors.forename: J
authors.initials: J
authors.lastname: Loidl
authors.forename: P
authors.initials: P
authors.lastname: Inama
authors.forename: A
authors.initials: A
authors.lastname: Perez
authors.forename: E
authors.initials: E
authors.lastname: Porqueras
authors.forename: E
authors.initials: E
authors.lastname: Wachberger
authors.forename: C
authors.initials: C
authors.lastname: Lebbe
authors.forename: A J
authors.initials: AJ
authors.lastname: Smelt
authors.forename: C
authors.initials: C
authors.lastname: Van der Vlies
authors.forename: J H
authors.initials: JH
authors.lastname: Miller
authors.forename: J M
authors.initials: JM
authors.lastname: Spieser
authors.forename: J
authors.initials: J
authors.lastname: Hoogmartens
mesh_terms: D000704:Analysis of Variance; D002853:Chromatography, Liquid; D004340:Drug Contamination; D007202:Indicators and Reagents; D007753:Laboratories; D010400:Penicillin G / Q000032:analysis*; D015203:Reproducibility of Results
chemical_list: D007202:Indicators and Reagents; D010400:Penicillin G