title: GLC analysis of theophylline, hydroxyethyltheophylline, and diphenylpyraline hydrochloride syrup.
abstract: A GLC method for determining theophylline, hydroxyethyltheophylline, and diphenylpyraline hydrochloride is presented. The method permits the separation and quantitative determination of the therapeutically active ingredients with a single injection in an overall time of approximately 2.5 hr.
mesh_terms: D001559:Benzhydryl Compounds / Q000032:analysis; D002849:Chromatography, Gas; D004338:Drug Combinations; D006634:Histamine H1 Antagonists / Q000032:analysis*; D008722:Methods; D010880:Piperidines / Q000032:analysis*; D012996:Solutions; D013806:Theophylline / Q000031:analogs & derivatives* / Q000032:analysis*
chemical_list: D001559:Benzhydryl Compounds; D004338:Drug Combinations; D006634:Histamine H1 Antagonists; D010880:Piperidines; D012996:Solutions; C009871:diphenylpyraline; D013806:Theophylline