title: Multiple response optimization applied to the development of a capillary electrophoretic method for pharmaceutical analysis.
abstract: Multiple response simultaneous optimization by using the desirability function was used for the development of a capillary electrophoresis method for the simultaneous determination of four active ingredients in pharmaceutical preparations: vitamins B(6) and B(12), dexamethasone and lidocaine hydrochloride. Five responses were simultaneously optimized: the three resolutions, the analysis time and the capillary current. This latter response was taken into account in order to improve the quality of the separations. The separation was carried out by using capillary zone electrophoresis (CZE) with a silica capillary and UV detection (240 nm). The optimum conditions were: 57.0 mmol l(-1) sodium phosphate buffer solution, pH 7.0 and voltage=17.2 kV. Good results concerning precision (CV lower than 2%), accuracy (recoveries ranged between 98.5 and 102.6%) and selectivity were obtained in the concentration range studied for the four compounds. These results are comparable to those provided by the reference high performance liquid chromatography (HPLC) technique.
authors.affiliation: Laboratorio de Control de Calidad de Medicamentos, Cátedra de Química Analítica I, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Santa Fe, Argentina.
authors.forename: Luciana Vera
authors.initials: LV
authors.lastname: Candioti
authors.forename: Juan C
authors.initials: JC
authors.lastname: Robles
authors.forename: Víctor E
authors.initials: VE
authors.lastname: Mantovani
authors.forename: Héctor C
authors.initials: HC
authors.lastname: Goicoechea