Objective To prepare enteric microcapsules of anti - inflammatory drug - ibuprofen with hydroxypropyl methylcellulose phthalate (HPMCP). Methods Ibuprofen microencapsulation with HPMCP through coacervation by the addition of sodium sulphate solution was investigated on the basis of the temperature - dependent coacervating formation of the polymer. The first - order derivative spectro-photometry was used to determine the content of drug at 274. 2nm,and it was proved to be a simple and accurate method. Results The enteric microcapsules were anomalistic particles under the microscope. Its diameter was 3 - 25μm. Drug load was 38. 50%. The drug encapsulated in the microcapsules was not released in the artificial gastric juice, whereas in artificial enteric juice the release of microcapsules was 96. 5% within 2h. Conclusion The unfavorable stimuli of drug was covered up when its enteric microcapsules were prepared,and the enteric microcapsules would not be soluble in the stomach but soluble when they arrived at the small intestine.%目的 以肠溶性高分子材料羟丙基甲基纤维素酞酸酯(HPMCP)为囊材将非甾体抗炎药布洛芬制备成肠溶微囊,对该微囊进行体外释药评价.方法 采用HPMCP为囊材,硫酸钠溶液为凝聚剂,布洛芬粉末为囊心物,以单凝聚法制成微囊.布洛芬微囊含量测定以无水乙醇为溶媒,超声破碎微囊并提取,用一阶导数分光光度法在274.2nm处测定.结果 布洛芬微囊无布洛芬刺激性气味,在显微镜下,呈不规则晶体状粒子,粒径3～25 μm.微囊含量测定方法 简单方便,灵敏度可靠.微囊的载药量为38.50％.微囊在人工胃液中2h内几乎不溶解,而在人工肠液中2h释药量达96.5％.结论 将非甾体抗炎药布洛芬制备成肠溶微囊,掩盖了药物的刺激性,可达到胃中不溶而肠中溶解的目的.
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