title: Simultaneous spectrophotometric determination of chlorphenoxamine hydrochloride and caffeine in a pharmaceutical preparation using first derivative of the ratio spectra and chemometric methods.
abstract: Three new methods are described for the simultaneous determination of chlorphenoxamine hydrochloride (CP) and caffeine (CAF) in their combination. In the first method, ratio spectra derivative spectrophotometry, analytical signals were measured at the wavelengths corresponding to either maxima and minima for both drugs in the first derivative spectra of the ratio spectra obtained by using each other spectra as divisor in their solution in 0.1 M HCl. In the other two methods, chemometric techniques, classical least-squares (CLS) and inverse least-squares (ILS), the concentration data matrix were prepared by using the synthetic mixtures containing these drugs in 0.1 M HCl. The absorbance data matrix corresponding to the concentration data matrix was obtained by the measurements of absorbances in the range 225-285 nm in the intervals with Deltalambda = 5 nm at 13 wavelengths in their zero-order spectra, then, calibration or regression was obtained by using the absorbance data matrix and concentration data matrix for the prediction of the unknown concentrations of CP and CAF in their mixture. The numerical values were calculated by using MAPLE V software in chemometric methods. The procedures do not require any separation step. The accuracy and the precision of the methods have been determined and they have been validated by analyzing synthetic mixtures containing title drugs. These three methods were successfully applied to a pharmaceutical formulation, sugar-coated tablet, and the results were compared with each other.
authors: Department of Analytical Chemistry, Faculty of Pharmacy, University of Ankara, 06100 Tandogan, Ankara, Turkey. dinc@pharmacy.ankara.edu.tr
authors: Erdal
authors: E
authors: Dinç
authors: I Murat
authors: IM
authors: Palabiyik
authors: Ozgür
authors: O
authors: Ustündağ
authors: Filiz
authors: F
authors: Yurtsever
authors: Feyyaz
authors: F
authors: Onur
mesh_terms: D000465:Algorithms; D002110:Caffeine / Q000032:analysis*; D002138:Calibration; D000697:Central Nervous System Stimulants; D004338:Drug Combinations; D005021:Ethylamines / Q000032:analysis*; D016018:Least-Squares Analysis; D010276:Parasympatholytics / Q000032:analysis*; D012015:Reference Standards; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013607:Tablets
chemical_list: D000697:Central Nervous System Stimulants; D004338:Drug Combinations; D005021:Ethylamines; D010276:Parasympatholytics; D012996:Solutions; D013607:Tablets; D002110:Caffeine; C100100:chlorphenoxamine