RESUMEN
We have identified two metabolites of clofazimine (B663; Lamprene; 3-(p-chloroanilino)-10-(p-chlorophenyl)-2,10-dihydro-2-isopropyliminophenazine) in our initial investigation of its metabolism in leprosy patients. Based on mass, ultraviolet, and visible spectrometry, we characterized an unconjugated (metabolite I, 3-(p-hydroxyanilino)-10-(p-chlorophenyl)-2,10-dihydro-2-isopropyliminophenazine ) and a conjugated (metabolite II, 3-(beta-D-glucopyranosiduronic acid)-10-(p-chlorophenyl)-2,10-dihydro-2-isopropyliminophenazine) metabolite from the urine of patients. Both metabolites were red in color, similar to clofazimine; however, both were considerably more polar than the parent drug. We suggest that metabolite I was formed by a hydrolytic dehalogenation reaction, and metabolite II by hydrolytic deamination followed by glucuronidation.
Asunto(s)
Clofazimina/análogos & derivados , Clofazimina/metabolismo , Lepra/metabolismo , Clofazimina/aislamiento & purificación , Clofazimina/uso terapéutico , Clofazimina/orina , Femenino , Humanos , Lepra/tratamiento farmacológico , Masculino , Modelos BiológicosRESUMEN
Clofazimine (CAS 2030-63-9) is an important drug used in the treatment of leprosy. Its important metabolites are investigated by thin layer chromatography (TLC), HPLC (diode array) and HPLC-electrospray mass spectrometry. The resulting analytical data, extraction, isolation and characterization methods are presented. Their applicability is described for human urine analysis.