title: Spectrophotometric determination of dopaminergic drugs used for Parkinson's disease, cabergoline and ropinirole, in pharmaceutical preparations.
abstract: Simple and reproducible spectrophotometric methods have been developed for determination of dopaminergic drugs used for Parkinson's disease, cabergoline (CAB) and ropinirole hydrochloride (ROP), in pharmaceutical preparations. The methods are based on the reactions between the studied drug substances and ion-pair agents [methyl orange (MO), bromocresol green (BCG) and bromophenol blue (BPB)] producing yellow colored ion-pair complexes in acidic buffers, after extracting in dichloromethane, which are spectrophotometrically determined at the appropriate wavelength of ion-pair complexes. Beer's law was obeyed within the concentration range from 1.0 to 35 microg ml(-1). The developed methods were applied successfully for the determination of these drugs in tablets.
authors.affiliation: Istanbul University, Faculty of Pharmacy, Department of Analytical Chemistry, Istanbul, Turkey. armaganozkul@yahoo.com
authors.forename: Armağan
authors.initials: A
authors.lastname: Onal
authors.forename: Sena
authors.initials: S
authors.lastname: Cağlar
mesh_terms: D000077465:Cabergoline; D015259:Dopamine Agents / Q000032:analysis* / Q000627:therapeutic use; D004873:Ergolines / Q000032:analysis* / Q000627:therapeutic use; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007211:Indoles / Q000032:analysis* / Q000627:therapeutic use; D010300:Parkinson Disease / Q000188:drug therapy*; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D015259:Dopamine Agents; D004873:Ergolines; D007211:Indoles; D004364:Pharmaceutical Preparations; C046649:ropinirole; D000077465:Cabergoline