A simple, rapid and highly sensitive spectrofluorimetric method was developed for determination of ziprasidone hydrochloride (ZPS) in capsules. The method is based on measuring the native fluorescence of ZPS in acetate buffer of pH 4.5 at 398 nm after excitation at 315 nm. The fluorescence-concentration plot was rectilinear over the range of 0.05–0.80 μg mL−1 with a lower detection limit (LOD) of 6.0 ng mL−1 and quantification limit (LOQ) of 20.0 ng mL−1. The method was fully validated and successfully applied to the determination of ZPS in its capsules with average percentage recovery of 99.7 ± 1.4. The method was extended to stability study of ZPS. The drug was exposed to acidic, alkaline, oxidative and photolytic degradation according to ICH guidelines. Moreover, the method was utilized to investigate the kinetics of the alkaline, acidic and oxidative degradation of the drug. A proposal for the degradation pathways was postulated.
开发了一种简单、快速且高度灵敏的光谱荧光法,用于测定胶囊中的
盐酸齐拉西酮(
ZPS)。该方法基于在pH 4.5的
乙酸盐缓冲液中,在315 nm激发后测量
ZPS的本征荧光,波长为398 nm。荧光-浓度图在0.05–0.80μg mL−1范围内呈直线性,检测下限(LOD)为6.0 ng mL−1,定量下限(LOQ)为20.0 ng mL−1。该方法经过全面验证,并成功应用于胶囊中
ZPS的测定,平均回收率为99.7 ± 1.4。该方法还扩展至
ZPS的稳定性研究。根据国际会议(ICH)指南,将药物暴露于酸性、碱性、氧化和光解降解中。此外,该方法还用于研究药物的碱性、酸性和氧化降解的动力学。对降解途径进行了假设。