title: Second derivative spectrophotometric determination of trimethoprime and sulfamethoxazole in the presence of hydroxypropyl-beta-cyclodextrin (HP-beta-CD).
abstract: An easy and rapid second-derivative spectrophotometric method for the simultaneous analysis of trimethoprime (TMP) and sulfamethoxazole (SM) is described. These drugs have been used as antibacterial against a wide spectrum of organisms and combinations of these drugs are commonly used for the treatment of a variety of infections. The most advantageous approach of this method is the use of HP-beta-CD, which allows to improve the performance of the second-derivative ultraviolet spectrophotometry. For both compounds, a shift of the absorption bands and variations of their intensity were observed. The calibration graphs were linear in the concentration range of TMP (1.92-19.2 microg ml(-1)) and SM (1.60-16.5 microg ml(-1)), the correlation coefficient for the calibration graphs was better than 0.9994 and the precision was satisfactory (CV%< 4.96) in HP-beta-CD solutions. The proposed method was successfully applied to the assay of commercial tablets. The results were compared to those obtained by second-derivative ultraviolet spectrophotometry in the absence of HP-beta-CD. Thereby, the details of the statistical treatment of the analytical data are also presented.
authors.affiliation: Departamento de Farmacia, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
authors.forename: Gladys
authors.initials: G
authors.lastname: Granero
authors.forename: Claudia
authors.initials: C
authors.lastname: Garnero
authors.forename: Marcela
authors.initials: M
authors.lastname: Longhi
mesh_terms: D000073738:2-Hydroxypropyl-beta-cyclodextrin; D000890:Anti-Infective Agents / Q000032:analysis*; D003505:Cyclodextrins; D004347:Drug Interactions; D005079:Excipients; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013420:Sulfamethoxazole / Q000032:analysis*; D014295:Trimethoprim / Q000032:analysis*; D047392:beta-Cyclodextrins
chemical_list: D000890:Anti-Infective Agents; D003505:Cyclodextrins; D005079:Excipients; D047392:beta-Cyclodextrins; D000073738:2-Hydroxypropyl-beta-cyclodextrin; D014295:Trimethoprim; D013420:Sulfamethoxazole