Determination of chlorpropamide in plasma, using high-performance liquid chromatography coupled to tandem mass spectrometry (LC/MS/MS) and their application in a study of bioequivalence / Determinação de clorpropamida em plasma empregando empregando cromatografia liquida de alta eficiencia acoplada a espectrometria de massa sequencial (LC/MS/MS) e sua aplicação em um estudo de bioequivalencia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The relative bioavailability between two formulations of chlorpropamide was assessed on the dosage form tablet 250 mg, in healthy volunteers of both sexes. The study was conducted using an open, randomized, two-period crossover design with the 3-week washout interval. Thirty-six subjects were selected. The blood samples were collected at the time prior to dosing and over an interval of 72 hours, of the single dose of each formulation, a Test (T) and another Reference (R). Chlorpropamide plasma concentrations were analyzed by high performance liquid chromatography coupled to tandem mass spectrometry (LC/MS/MS) with positive ion electrospray ionization using multiple reaction monitoring (MRM). The limit of quantification was 0,1 µg/mL for plasma Chlorpropamide analysis. The internal standard was the glibenclamide. The AUC 0-72, which represents AUC truncated, Cmax and Tmax were obtained from plasma concentration-time curve. The AUC was calculated using the trapezoidal rule. Only AUC0-72 and Cmax of the each other formulations were statistically compared. The geometric mean and respective 90% confidence interval (CI) of T/R ratios were 93.99 (87.11%?101.41%) for Cmax and 92.45 (85.96%-99.44 %) for AUC0-72. Since the interval confidential (90%) for AUC0-72 and Cmax ratios were within the 80-125% interval proposed by the Agência Nacional de Vigilância Sanitária-Brazil (Brasil-Anvisa) and by the Food and Drug Administration (USA-FDA), it was concluded that both the formulations studied are bioequivalent for both the rate and extent of absorption and, therefore can be used interchangeably without impairing therapeutic effectiveness. Key words: Chlorpropamide, bioequivalence, high performance liquid chromatography coupled to tandem mass spectrometry (LC/MS/MS), bioavailability, pharmacokinetic

ASSUNTO(S)

espectometria de massa bioequivalence cromatografia liquida de alta eficiencia mass spectrometry validação de metodo pharmacokinetics bioequivalencia plasma validation of method plasma bioavailability farmacocinetica biodisponibilidade

ACESSO AO ARTIGO

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