Add time:08/28/2019         Source:sciencedirect.com

Nicorandil is a unique vasodilator that combines the actions of a potassium channel activator and a nitrovasodilator. Little literature is available on its chemical stability and pharmacokinetics in animals. We developed a simple, specific, sensitive, and precise high-performance liquid chromatographic method for the determination of nicorandil in aqueous solution and rat plasma, achieving a detection limit of 0.3 μg/ml with 180-μl samples. Nicorandil was found to be relatively stable between pH 2 and 10 at 37°C (half-life = 461-84 h) and it is subjected to specific base catalysis above pH 10. Both chemical degradation and in vivo metabolism produced N-(2-hydroxyethyl)nicotinamide, the denitrated product. Preliminary pharmacokinetic investigations showed that the assay is capable of quantitating nicorandil in rat plasma over a range of 0.3–100 μg/ml. These studies also suggested that the pharmacokinetics of nicorandil are dose-dependent.

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