Physicochemical characterization of NPC 1161C, a novel antimalarial 8-aminoquinoline, in solution and solid state.

NPC 1161C is a novel antimalarial drug of interest because of its superior curative and prophylactic activity, and favorable toxicity profile against in vivo and in vitro models of malaria, pneumocystis carinii pneumonia, and leishmaniasis. The preformulation studies performed included determination of pK(a)s, aqueous and pH solubility, cosolvent solubility, log P, pH stability, thermal analysis, and preliminary hygroscopicity studies. The mean pK(a1), pK(a2), and pK(a3) were determined to be 10.

Development and validation of a stability-indicating reversed-phase high performance liquid chromatography method for NPC 1161C, a novel 8-aminoquinoline anti-malarial drug.

NPC 1161C (+/-8-[(4-amino-1-methylbutyl)amino-5-(3,4-dichlorophenoxy)-6-methoxy-4-methylquinoline succinate]) is a novel investigational antimalarial drug of interest for its in vivo oral potency, activity against blood and tissue stage parasites, favorable toxicity profile, long duration of action, and utility in both prophylaxis and treatment models. The pharmaceutical development of NPC 1161C warranted the availability of an assay for the detection and quantification of the drug and its separation from the impurities and degradation products. A simple and rapid stability-indicating reversed-phase HPLC method was developed and validated according to ICH guidelines.