星点设计-响应面法优化米拉贝隆缓释片处方

摘要

OBJECTIVE:To optimize the formulation of Mirabegron sustained-release tablets. METHODS:Using polyethylene oxide(PEO)and hydroxypropylmethyl cellulose(HPMC K4M)as the sustained release matrix,Mirabegron sustained-release tab-lets were prepared by powder direct compression technology. Using 1,3,5,7 h accumulative release rate as indexes,the amounts of PEO,HPMC K4M and OPADRY? were optimized by composite design-response surface method,and then validated. Accumula-tive release rates of sustained-release tablet and original tablet (MyrbetriqTM) were compared in different pH mediums (water,pH 1.0 simulated gastric fluid,pH 4.5 acetate buffer solution,pH 6.8 phosphate buffer solution) at different rotation rates (100,50 r/min),and similiar factor f2 was calculated to fit drug release model of sustained-release tablet. RESULTS:In the optimized firmu-lation each Mirabegron sustained-release tablet contained mirabegron 25 mg,PEO 108.02 mg,HPMC K4M 21.69 mg,OPADRY? 2.27%. Relative error of accumulative release rates at 1,3,5,7 h to predicted value were 4.78%,3.48%,0.69% and -1.41%, respectively. f2 of release curves of sustained-release tablet and original tablet were higher than 65 in different pH medium at differ-ent rotation rates. The drug release of sustained-release tablet was fitted to zero-order release equation. CONCLUSIONS:Mirabe-gron sustained-release tablet by optimized technology is similar to original tablet in drug release behavior.%目的:优化米拉贝隆缓释片处方.方法:采用聚氧乙烯(PEO)和羟丙甲基纤维素(HPMC K4M)为缓释骨架材料,以粉末直压法制备米拉贝隆缓释片.以1、3、5、7 h的累积释放度为指标,采用星点设计-响应面法优化处方中PEO、HPMC K4M和包衣液(OPADRY?)的用量,并进行验证.比较所制缓释片与原研片(MyrbetriqTM)在不同pH介质(水、pH 1.0的人工胃液、pH 4.5醋酸盐缓冲液、pH 6.8磷酸盐缓冲液)中不同转速(100、50 r/min)下的累积释放度,计算相似因子f2,拟合缓释片的释药模型.结果:优化处方中每片米拉贝隆缓释片含米拉贝隆25 mg、PEO 108.02 mg、HPMC K4M 21.69 mg、OPADRY?2.27%;其1、3、5、7 h的累积释放度与预测值的相对误差分别为4.78%、3.48%、0.69%、-1.41%.所制缓释片与原研片在不同pH介质中和不同转速下释放曲线的f2均大于65;缓释片释药符合零级释药特征.结论:优化处方制备的米拉贝隆缓释片与原研片的释放行为相似.