title: Simultaneous determination of trimethoprim and sulphamethoxazole in veterinary formulations by chromatographic multivariate methods.
abstract: A comparative chromatographic study was developed for the simultaneous quantitative resolution of trimethoprim (TMP) and sulphamethoxazole (SMX) in veterinary formulations. Multi-wavelength chromatograms were recorded by using diode array detector (DAD) system at the five-wavelength set consisting of 220, 230, 240, 250 and 260 nm. In the first step, five different calibration equations at the above wavelengths for each drug were obtained by using the relationship between concentration and peak area. These calibration graphs were used for the quantitative evaluation of TMP and SMX in samples. These single-wavelength applications were called traditional LC method. In the second step, principal component regression (PCR) and partial least-squares (PLS) calibrations were applied to the above mentioned multi-wavelength chromatograms. The amount of two investigated drugs in samples was determined by the constructed PCR and PLS calibrations. The experimental results obtained from each single-wavelength calibration graph were compared with those obtained by the chemometric approaches and chromatographic multivariate approaches give successful results more than traditional LC method.
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100 Tandogan-Ankara, Turkey. dinc@pharmacy.ankara.edu.tr
authors.forename: E
authors.initials: E
authors.lastname: Dinç
authors.forename: A
authors.initials: A
authors.lastname: Bilgili
authors.forename: B
authors.initials: B
authors.lastname: Hanedan
mesh_terms: D000892:Anti-Infective Agents, Urinary / Q000032:analysis*; D002138:Calibration; D002853:Chromatography, Liquid; D007202:Indicators and Reagents; D016018:Least-Squares Analysis; D015999:Multivariate Analysis; D025341:Principal Component Analysis; D015203:Reproducibility of Results; D012997:Solvents; D015662:Trimethoprim, Sulfamethoxazole Drug Combination / Q000032:analysis*; D019155:Veterinary Drugs / Q000032:analysis*
chemical_list: D000892:Anti-Infective Agents, Urinary; D007202:Indicators and Reagents; D012997:Solvents; D019155:Veterinary Drugs; D015662:Trimethoprim, Sulfamethoxazole Drug Combination