Study of the mechanism of cationic drug release increase coated with Surelease
after curing

This paper describes the investigation of the release mechanism of the cationic drug coated with Surelease
after curing compared with nonionic and anionic drug.The release rate of cured propafenone hydrochloride pellets coated with Surelease
was increased significantly compared with uncured ones.The changes in release rate after seal-coating proved the migration of drug into the polymer film.Based on a comparative study of ammonia permeation tests and the impact of ammonia on drug with different properties,it was shown that the change in release of the cationic drug after curing was related to the combination of cationic drug and ammonia in Surelease
.Also,the scanning electron microscopy results showed that curing and dissolution can both prevent polymer film coalescence.During coating,the evaporated ammonia combined with the cationic drug and the polymer film coalesced.However,the combined ammonia could be decomposed during curing and interrupt the coalescence of the polymer-coat,leading to increased release.In an optimized process,the ammonia in the Surelease
can be evaporated quickly and the ionization of the drug will be reduced.All these factors can contribute to the formation of the polymer film.

豆腐果素缓释微丸包衣工艺的研究

分别以Surelease、Eudragit RS30D/RL30D为包衣材料,制备豆腐果素缓释微丸,筛选包衣工艺的优化参数。结果表明,用Surelease、Eudragit两种包衣材料均可得到在12h内缓慢释放的微丸,后者有近1h的时滞。

流化床包衣法制备盐酸普萘洛尔药物树脂缓释微囊

目的采用流化床包衣法制备缓释药物树脂微囊,并考察其释放特性。方法采用底喷式空气悬浮包衣法,以药物树脂复合物为囊心,Surelease水分散体为包衣材料,通过对药物释放特性的考察,确定优化的最终包衣工艺及用量。结果在流化风量35 m3·h-1,恒流泵流速3 mL·min-1,包衣温度60℃的工艺条件下,包衣增质量为10%、滑石粉用量为8%时,药物树脂微囊有很好的缓释特征。结论流化床包衣法制备微囊,工艺稳定、可连续操作。