目的制备用于治疗溃疡性结肠炎的pH依赖型愈肠宁结肠靶向片(pH-dependen t Y uchangn ing T ab let forco lon-spec ific de livery,PYTCSD),并对其体内外释放性能进行评价,探讨制备中药结肠靶向制剂的可行性。方法以苦参碱和氧化苦参碱体外释放度为指标,对制剂的包衣处方进行筛选;采用体外释放度测定法考察该制剂的体外释放性能;采用硫酸钡造影技术对该制剂在人体内的释放性能进行评价。结果拟订了PYTCSD的制备方法:将药物制备得片芯后,以质量浓度3.70%(g/mL)丙烯酸树脂Ⅲ(Eudrag itⅢ)、0.37%(g/mL)邻苯二甲酸二乙酯(DEP)、0.93%(g/mL)滑石粉的乙醇混悬溶液为包衣液,包衣使片芯增重8%,即得;体外释放度测定结果表明,在人工胃液2 h时溶出液中未检测到苦参碱和氧化苦参碱,在人工小肠液4 h时两指标累积溶出率均<10%,而在人工结肠液1 h时苦参碱和氧化苦参碱分别累积溶出86.5%和86.8%;体内释放度试验结果表明,PYTCSD在8名志愿者体内均能完整到达回盲部或升结肠,并在上述部位崩解释放出药物。结论制备得pH依赖型愈肠宁结肠靶向片能达到较好结肠定位释药的目的。

Objective To prepare the pH-dependent Yuchangning Tablet for colonspecific delivery(PYTCSD)used in treating the ulcerative colitis and evaluating the releasing property in vivo and in vitro.Methods The coating prescription was screened by the in vitro delivery of matrine and oxymatrine.The invitro releasing property of the preparation was examined by the method of in vitro delivery.The in vivoreleasing property of the preparation was evaluated by the shadowgraph technique of barium sulfate.Results The preparation method of the PYTCSD was obtained.The core of the tablet was coated by the alcohol solution mixed with 3.70%(g/mL)EudragitⅢ,0.37%(g/mL)DEP,and 0.93%(g/mL) talcum power.The weight of the core was increased 8%.From the in vitro delivery,matrine and oxymatrine were not detected in the simulated gastric fluid after 2 h.The quantities of matrine and oxymatrine were less 10%in the simulated intestinal fluid after 4 h.The quantities of matrine and oxymatrine were 86.5%and 86.8%in the simulated colon fluid after 1 h.On the basis of the in vivo delivery by treating eight volunteers,the PYTCSD could completely get to the ileocecum or ascending colon and disintegrate in that part.Conclusion The PYTCSD can be prepared and the preparation issignificantly delivered in the specific.colon.

国家自然科学基金资助项目(30371780)