title: Liquid chromatography-ion trap tandem mass spectrometry for the characterization of polypeptide antibiotics of the colistin series in commercial samples.
abstract: A selective reversed-phase liquid chromatography-tandem mass spectrometry method is described for the characterization of related substances in the colistin complex. Mass spectral data were acquired on an LCQ ion trap mass spectrometer equipped with an electrospray ionization probe operated in the positive ion mode. The main advantage of this technique is the characterization of novel related substances without time-consuming isolation and purification procedures. Using this method seven new related substances were partially identified in colistin bulk sample and tablets. Four components were assigned as isomers of the main components of colistin.
authors.affiliation: Katholieke Universiteit Leuven, Faculteit Farmaceutische Wetenschappen, Laboratorium voor Farmaceutische Chemie en Analyse van Geneesmiddelen, E. Van Evensraat 4, B-3000 Leuven, Belgium.
authors.forename: Cindy
authors.initials: C
authors.lastname: Govaerts
authors.forename: Jennifer
authors.initials: J
authors.lastname: Orwa
authors.forename: Ann
authors.initials: A
authors.lastname: Van Schepdael
authors.forename: Eugène
authors.initials: E
authors.lastname: Roets
authors.forename: Jos
authors.initials: J
authors.lastname: Hoogmartens
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D003091:Colistin / Q000737:chemistry*; D012015:Reference Standards; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000900:Anti-Bacterial Agents; D003091:Colistin