Kollicoat~ SR30D在盐酸青藤碱微丸型缓释片中的应用

以新型水分散体Kollicoat SR30D为微丸的衣膜材料,制备盐酸青藤碱缓释包衣微丸;随后将其与适宜的辅料混匀后直接压片,制得能缓释12 h的微丸型片剂.考察了增塑剂种类和用量对微丸中药物释放的影响,以及压片过程中填充剂比例对微丸的保护作用.结果表明,以10%柠檬酸三乙酯作增塑剂的Kollicoat SR30D能在流化床包衣过程中形成致密完整的衣膜,无需愈合处理.将包衣增重为18%的微丸与硅化微晶纤维素颗粒以1：3（w/w）混匀,再加入0.5%硬脂酸镁,直接压片可制得缓释12 h的微丸型片剂,且压片前后药物释放行为无显著差异.

Kollicoat SR 30D游离膜的拉伸性能和透湿性

采用平面铸膜法制备Kollicoat SR 30D游离膜,以自制简易膜拉伸试验装置初步检测膜的机械性能,并考察增塑剂及致孔剂对膜延伸率和膜透湿性的影响。结果表明,增大增塑剂枸橼酸三乙酯(TEC)的用量可使膜延伸率和透湿性明显提高;3种致孔剂(聚乙二醇6000、聚维酮K30和羟丙甲纤维素E5)均能提高薄膜的透湿性,但对膜延伸率无明显改变。进一步研究表明,聚乙二醇用量对以10%TEC为增塑剂的膜的延伸率和透湿性无明显影响。

Formulation Development of Generic Omeprazole 20 mg Enteric Coated Tablets

Omeprazole is a potent proton pump inhibitor with powerful inhibition of secretion of gastric juice. Oral site-specific drug delivery systems have recently attracted a great interest for the local treatment of bowel disease and for improving systemic absorption of drugs which are unstable in the stomach. However, microenvironment in the gastrointestinal tract and varying absorption mechanisms cause hindrance for the formulation and optimization of oral drug delivery. The objective of the study was to develop and optimize enteric coating process for omeprazole tablets. Different batches of core tablets were sub coated, one set sub coated with opadry and another with a mixture of light magnesium oxide, magnesium stearate and absolute alcohol omeprazole magnesium. Seal coating was applied by using opadry to achieve certain weight gain and to protect omeprazole from acidic coating polymers. A comparative dissolution test was performed. The variation of thickness and diameter were observed to be minimal with a weight gain of 3% - 4% of enteric polymer. Disintegration test showed that in each tested batch the enteric coated layer remained intact in 0.1N HCl for 2 hours and when exposed to alkaline media of phosphate buffer pH 6.8, it dissolved within few minutes. Dissolution release was 98.8% to 102.4% within two hours when the product was exposed to phosphate buffer pH 6.8 after 2 hours. The similarity and dis-similarity factors were calculated and observed to be 54 to 61 and 4 to 5 respectively. Therefore a simple and good enteric coating process was developed and tested with potential for transfer this technology into local pharmaceutical industries using cheap and easily available materials.

混合水分散体肠溶迟释薄膜性能研究

目的 采用肠溶型水分散体EudragitL30D-55和控释型水分散体KollicoatSR30D混合制备一种全新的对周围环境p H值具有响应的,同时具有迟释性能的聚合物薄膜。方法 采用铸膜法制备L30D-55∶SR30D混合水分散体游离膜,采用差示扫描量热法（DSC）测定薄膜玻璃化转变温度（glass transition temperature,Tg）,万能材料试验机测试薄膜拉伸性能,杯法考察薄膜透湿性能。考察聚合物比例、附加剂种类和用量对薄膜性能的影响,并以制备泮托拉唑钠（PAZ-Na）肠溶迟释微丸考察包衣膜特性。结果 随着SR30D的增加,薄膜的Tg逐渐降低,强度和刚性变弱,韧性变强,透湿性能先不变后增加。随着增塑剂增加,薄膜刚性减弱,渗透性能增强。不溶性成分的加入可不同程度降低薄膜的渗透性。制备的肠溶迟释微丸在0.1 mol·L^-1盐酸中2 h药物损失量〈5%,在p H 6.8缓冲液中可延迟10~20 min开始释放,并至90 min释放完全。结论 L30D-55∶SR30D混合水分散体制备的游离膜和包衣膜具有良好的理化性能,可用于肠溶调释制剂的研究和开发。