title: Chemometric resolution of a mixture containing hydrochlorothiazide and amiloride by absorption and derivative spectrophotometry.
abstract: Four chemometric techniques, classical least squares (CLS) and inverse least squares (ILS) and principal component regression (PCR) and partial least squares regression (PLSR) were applied to the absorption and derivative spectrophotometric determinations of amiloride and hydrochlorothiazide in a pharmaceutical preparation. Four chemometric calibrations for both zero-order and first derivative spectra were constructed by measuring the absorbance and their dA/dlambda values at 34 points in the wavelength range 205-395 nm for a training set containing 2-10 microg/ml amiloride and 4-28 microg/ml hydrochlorothiazide corresponding to 25 point mixture design. The building chemometric calibrations were confirmed by using the synthetic mixtures containing two drugs. The results obtained by the proposed techniques based on the use of the measurements at the absorption spectra and at the first derivative spectra were statistically compared with each other.
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, University of Ankara, 06100 Tandogan, Ankara, Turkey. dinc@pharmacy.ankara.edu.tr
authors.forename: Erdal
authors.initials: E
authors.lastname: Dinç
authors.forename: Ozgür
authors.initials: O
authors.lastname: Ustündağ
mesh_terms: D000584:Amiloride / Q000032:analysis*; D000959:Antihypertensive Agents / Q000032:analysis*; D004338:Drug Combinations; D006852:Hydrochlorothiazide / Q000032:analysis*; D004364:Pharmaceutical Preparations; D013056:Spectrophotometry, Ultraviolet; D013678:Technology, Pharmaceutical
chemical_list: D000959:Antihypertensive Agents; D004338:Drug Combinations; D004364:Pharmaceutical Preparations; D006852:Hydrochlorothiazide; D000584:Amiloride