title: Simultaneous determination of dextromethorphan HBr and bromhexine HCl in tablets by first-derivative spectrophotometry.
abstract: A rapid, simple and direct assay procedure based on first-derivative spectrophotometry, using a zero-crossing and peak-to-base measurement at 234 and 324 nm, respectively, has been developed for the specific determination of dextromethorphan HBr and bromhexine HCl in tablets. Calibration graphs were linear with the correlation coefficients of 0.9999 for both analytes. The limit of detections were 0.033 and 0.103 microgram ml-1 for dextromethorphan HBr and bromhexine HCl, respectively. A HPLC method has been developed as the reference method. The results obtained by the first-derivative spectrophotometry were in good agreement with those found by the HPLC method.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Thailand.
authors.forename: V
authors.initials: V
authors.lastname: Tantishaiyakul
authors.forename: C
authors.initials: C
authors.lastname: Poeaknapo
authors.forename: P
authors.initials: P
authors.lastname: Sribun
authors.forename: K
authors.initials: K
authors.lastname: Sirisuppanon
mesh_terms: D000996:Antitussive Agents / Q000032:analysis*; D001964:Bromhexine / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D003915:Dextromethorphan / Q000032:analysis*; D005100:Expectorants / Q000032:analysis*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D000996:Antitussive Agents; D005100:Expectorants; D003915:Dextromethorphan; D001964:Bromhexine