title: Near-infrared spectrometric determination of dipyrone in closed ampoules.
abstract: The present paper proposes an analytical method for fast near-infrared (NIR) determination of dipyrone in injectable formulations with a nominal content of 50.0%mv(-1) without violation of the ampoule. For this purpose, two multivariate calibration methods are evaluated, namely Partial-Least-Squares (PLS) and Multiple Linear Regression (MLR) with variable selection by the Successive Projections Algorithm (SPA). The resulting models comprised four latent variables (PLS) and five spectral variables (MLR-SPA). Appropriate predictions were obtained in both cases, with RMSEP values of 0.39 (PLS) and 0.35%mv(-1) (MLR-SPA) and correlation coefficients of 0.9970 (PLS) and 0.9975 (MLR-SPA) for a calibration range of 40-60%mv(-1). No systematic error was observed and no significant differences were found between the predicted and reference values, according to a paired t-test at 95% confidence level.
authors.affiliation: Universidade Federal da Paraíba, Departamento de Química, Caixa Postal 5093, CEP 58051-970 João Pessoa, PB, Brazil.
authors.forename: Fátima Aparecida C
authors.initials: FA
authors.lastname: Sanches
authors.forename: Rosimeri B
authors.initials: RB
authors.lastname: Abreu
authors.forename: Márcio José Coelho
authors.initials: MJ
authors.lastname: Pontes
authors.forename: Flaviano C
authors.initials: FC
authors.lastname: Leite
authors.forename: Daniel Jackson E
authors.initials: DJ
authors.lastname: Costa
authors.forename: Roberto Kawakami H
authors.initials: RK
authors.lastname: Galvão
authors.forename: Mario Cesar U
authors.initials: MC
authors.lastname: Araujo
mesh_terms: D000465:Algorithms; D002138:Calibration; D004177:Dipyrone / Q000032:analysis*; D006801:Humans; D007267:Injections; D012044:Regression Analysis; D012984:Software; D019265:Spectroscopy, Near-Infrared
chemical_list: D004177:Dipyrone