Preparation of sorafenib self-microemulsifying drug delivery system and its relative bioavailability in rats  

索拉非尼自微乳化给药系统的制备及药物动力学研究(英文)

作　　者：刘亚欧[1] 范洁明[2] 王学清[2] 张强[2] 

机构地区：[1]北京大学第一医院药剂科,北京100034 [2]北京大学医学部药学院药剂学系,北京100191

出　　处：《Journal of Chinese Pharmaceutical Sciences》2011年第2X期164-170,共7页中国药学（英文版）

基　　金：The 973 Project(Grant No.2009CB930300);Scientific and Technological Major Special Project -"Significant Creation of New Drugs"(Grant No.2009ZX09310-001).

摘　　要：Sorafenib is a novel antitumor drug,which is poorly absorbed in the gastrointestinal tract due to its low solubility in water.To improve the bioavailability of sorafenib,a self-microemulsifying drug delivery system(SMEDDS) formulation of sorafenib was prepared and its relative bioavailability in rats was evaluated.The blank SMEDDS was prepared from a mixture of ethyl oleate(oil phase,20%,w/w),Cremophol EL(surfactant,48%,w/w),PEG-400(co-surfactant,16%,w/w) and ethanol (co-surfactant,16%,w/w).Sorafenib was subsequently dissolved in the blank SMEDDS to obtain a sorafenib SMEDDS formulation with a final sorafenib concentration at 20 mg/mL.The particle size of the emulsified sorafenib SMEDDS was about 20-25 nm. Compared with sorafenib suspension,the prepared SMEDDS formulation exhibited no effect on the T_(max),but significantly increased the AUC,C_(max) and MRT and decreased the drug clearance.Most importantly,the oral bioavailability based on AUC_(0-72h) increased about 25 times after formulating sorafenib in SMEDDS.We concluded that SMEDDS could be a promising vesicle for the oral delivery of the poorly soluble antitumor drug sorafenib.索拉非尼(Sorafenib)是一种新型抗肿瘤药物,但其在水中难溶,生物利用度低。为了增加索拉非尼的生物利用度,本研究制备了索拉非尼自微乳化给药系统,并以大鼠为实验动物测定了该给药系统的口服相对生物利用度。该给药系统以油酸乙酯(20%,w/w)为油相,聚氧乙烯蓖麻油(48%,w/w)为主要乳化剂,聚乙二醇400(16%,w/w)和乙醇(16%,w/w)为助乳化剂,索拉非尼的终浓度为20 mg/mL。该制剂自微乳化后粒径为20-25 nm。与索拉非尼混悬液相比,自微乳化给药系统可以显著增加索拉非尼的AUC,C_(max)和MRT,降低清除率,T_(max)没有明显变化。尤其是与口服混悬液相比,其相对生物利用度提高近25倍,说明索拉非尼自微乳化给药系统有望开发成为增加其口服吸收的药物制剂。

关 键 词：SORAFENIB SMEDDS Relative bioavailability 

分 类 号：R969.1[医药卫生—药理学]