title: Multiple injection technique for the determination and quantitation of insulin formulations by capillary electrophoresis and time-of-flight mass spectrometry.
abstract: This paper describes an efficient CE-UV-ESI-TOF/MS method for the determination and quantitation of intact insulin (INS) in a pharmaceutical formulation. The CE conditions were optimized to avoid the adsorption of proteins onto the capillary wall. Particular attention was paid regarding the choice of the internal standard (IS). A strategy based on multiple injections was selected and the methodology was validated according to international guidelines. The optimized method was applied with success to the analysis of INS formulations obtained from regular and parallel markets.
authors.affiliation: School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Bd d'Yvoy 20, 1211 Geneva 4, Switzerland.
authors.forename: Aline
authors.initials: A
authors.lastname: Staub
authors.forename: Serge
authors.initials: S
authors.lastname: Rudaz
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Veuthey
authors.forename: Julie
authors.initials: J
authors.lastname: Schappler
mesh_terms: D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods*; D007328:Insulin / Q000032:analysis*; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*
chemical_list: D007328:Insulin