title: High-performance micellar liquid chromatography determination of sulphonamides in pharmaceuticals after azodye precolumn derivatization.
abstract: A chromatographic procedure with precolumn derivatization to form the N-(1-naphthyl)ethylenediamine dihydrochloride azodyes is proposed for the analysis of several sulphonamides (sodium sulphacetamide, sulphadiazine, sulphaguanidine, sulphamerazine, sulphamethizole, sulphamethoxazole, sulphanilamide and sulphathiazole) in pharmaceutical preparations (tablets, pills, capsules, suspensions and drops). The separation is performed with a 0.05 M sodium dodecyl sulphate/2.4% pentanol eluent at pH 7. The precolumn derivatization improved the resolution in the chromatograms and increased the selectivity in the determination of mixtures of sulphonamides and in preparations where other drugs were present. The derivatization reaction was readily performed in a micellar medium of SDS at pH 1, leading to a rapid and simple procedure. The recoveries were in the 97-104% range with relative standard deviations usually below 3%.
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de València, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: García-Alvarez-Coque
authors.forename: E F
authors.initials: EF
authors.lastname: Simo-Alfonso
authors.forename: G
authors.initials: G
authors.lastname: Ramis-Ramos
authors.forename: J S
authors.initials: JS
authors.lastname: Esteve-Romero
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008823:Micelles; D011786:Quality Control; D013056:Spectrophotometry, Ultraviolet; D013449:Sulfonamides / Q000032:analysis* / Q000737:chemistry
chemical_list: D001391:Azo Compounds; D007202:Indicators and Reagents; D008823:Micelles; D013449:Sulfonamides