氟比洛芬乙基纤维素水分散体包衣小丸的制备及体外释药特性

目的：制备氟比洛芬包衣小丸，评价其体外释药特性。方法：离心造粒法制备空白丸芯及载药小丸；以乙基纤维素水分散体为包衣材料，羟阿基甲基纤维素为致孔剂，流化床制备氟比洛芬包衣小丸；释放度实验考察小丸的体外释药特性。结果：包衣小丸缓释胶囊的释放曲线与进口缓释胶囊ForbensR相似，羟丙基甲基纤维素的用量和介质pH值对释药影响显著，而热处理时间和胶囊壳对释药无显著性影响。结论：氟比洛芬包衣小丸具有较理想的体外缓释效果。     

盐酸氨溴索包衣小丸的制备及其释药特性

目的：研制盐酸氨溴索（Amb）包衣小丸，评价其体外释药特性及释药机制。方法：Glatt流化床底喷装置中混悬液法上药制备载药小丸，分别以不同eudragit RS100/eudragit RL100配比为包衣材料制备包衣小丸，释放度试验及扫描电镜考察小丸的体外释药特性及释药机制。结果：包衣小丸在扫描电镜下表面光滑圆整，纵切面层次分明；4种小丸配比而成的缓释胶囊释药曲线与进口缓释胶囊兰勃素差异无显著性，且不受介质pH和转篮转速等因素影响；包衣小丸的释药机制可能为浓度梯度作用下Amb按Fick's定律从完整eudragit膜聚合物链间的分子孔隙扩散。结论：Amb包衣小丸具有理想的缓释效果。     

离心造粒包衣法制备洛索洛芬钠缓释微丸及体外释放度考察

目的:制备洛索洛芬钠缓释微丸。方法:采用离心造粒包衣法制备洛索洛芬钠微丸。首先制备微晶纤维素空白母核和洛索洛芬钠含药素丸,并在此基础上进行丙烯酸树脂水分散体(Eudragit NE30D、Eudragit L30D-55)包衣,并对包衣微丸的释药特征进行探讨。结果:微晶纤维素(MCC)空白母核32～40目的收率约78.6%,含药素丸18～24目收率约88.2%,使用Eudragit NE30D和Eudragit L30D-55比例是20:1的包衣液,包衣增重10%。包衣干燥后,即得洛索洛芬钠缓释微丸,洛索洛芬钠缓释胶囊体外释药行为较好地符合Higuchi方程。结论:在优化的工艺条件下可制得表面光滑、圆整度高的洛索洛芬钠缓释微丸。     

酮洛芬缓释胶囊剂制备工艺正交设计实验及其体外释放特性研究

采用小丸包衣工艺,利用正交设计实验对胶囊的处方、工艺进行筛选与优化,制备酮洛芬缓释胶囊,并测定其释放特征。结果表明:以优选的处方和工艺制备的缓释胶囊,体外释药缓释特征明显,持续释药达12h以上。该缓释胶囊处方合理,工艺简单,适合于工业化生产。     

酮洛芬缓释胶囊剂制备工艺正交设计实验及其体外释放特性研究

采用小丸包衣工艺,利用正交设计实验对胶囊的处方、工艺进行筛选与优化,制备酮洛芬缓释胶囊,并测定其释放特征。结果表明:以优选的处方和工艺制备的缓释胶囊,体外释药缓释特征明显,持续释药达12h以上。该缓释胶囊处方合理,工艺简单,适合于工业化生产。     

离心造粒法制备罗红霉素缓释小丸

目的：制备罗红霉素缓释小丸,并对其体外释药情况进行研究。方法：采用离心造粒技术制备微晶纤维素空白丸核和罗红霉素含药丸芯,以聚丙烯酸树脂Eudragit NE30D为包衣液制成膜控缓释小丸,考察包衣增重、致孔剂用量等因素对缓释小丸释放度的影响。结果：通过单因素考察确定了包衣液处方,所制备的小丸具有明显的缓释特征,体外释药过程符合一级动力学模型。结论：制备的罗红霉素缓释小丸符合12h缓释要求。     

硝苯地平缓释胶囊的制备及释放度测定

目的 研制硝苯地平24h缓释胶囊并进行体外释放度测定。方法 采用流化床包衣法，将硝苯地平与聚乙烯吡咯烷酮溶于90％乙醇喷于空白丸芯制成固体分散体含药小丸．以含有致孔剂的乙基纤维素水分散体（Surelease）作为包衣材料进行包衣，得小丸装胶囊。对各处方缓释胶囊进行释放度测定，筛选最佳处方并进行体外释药模型拟合。结果 按最佳处方制得的胶囊中药物体外释放行为良好。胶囊体外释药行为符合一级动力学方程 结论 硝苯地平缓释胶囊达到了缓释制剂要求。     

扑热息痛缓释胶囊工艺探讨

扑热息痛是临床上常用的解热镇痛药，但其半衰期短,服用不方便，为减少服药次数，本研究选用适当的辅料，先制备均匀颗粒，再包衣制得缓释小丸，装入胶囊，探索其缓释胶囊的制备方法。通过处方、工艺的筛选与优化，所制的缓释胶囊的体外持续释药达8小时以上。本工艺重现性好，收率高，适合工业化生产。     

盐酸氨溴索缓释胶囊的研制

采用薄膜试验法进行包衣处方优化,筛选出适合丙烯酸树脂(Eudragit) RS100包衣的较理想增塑剂邻苯二甲酸二丁酯,流化床底喷装置中混悬液法上药制备载药小丸后包衣,以4种不同释药包衣小丸配比,制得日服1次的盐酸氨溴索缓释胶囊.8名健康志愿者单剂量口服自制缓释胶囊与进口同剂型缓释胶囊后,体内吸收和峰浓度以及经对数转化均无显著性差异(P>0.05),具有生物等效性,自制胶囊的相对生物利用度为(108.27±15.57)%,并具有显著的体内外相关性(P<0.01).     

离心造粒法制备双氯芬酸钠缓释小丸

目的：研究离心造粒法制备双氯芬酸钠缓释小丸。方法：用BZJ-360MⅡ包衣造粒机制备双氯芬酸钠的空白糖粉丸芯及其含药素丸,并用乙基纤维素进行包衣。结果：用离心包衣造粒机制得的空白糖粉丸芯大小为28～30目,收率为62．5％;在此空白丸芯基础上,以4％PVP为粘合剂制备双氯芬酸钠含药素丸,载药量达148．5％,24～28目的含药小丸收率为92．5％;最后用乙基纤维素包衣液包衣,干燥,即得双氯芬酸钠缓释小丸。经释放度测定,在2、6和12h的释放量均符合标准规定。结论：该制备技术操作简单、灵活,包衣均匀,可自动化操作。     

盐酸青藤碱肠溶缓释微丸的制备

目的：制备盐酸青藤碱肠溶缓释微丸。方法：分别以Eudragit NE30D为缓释膜材，HPMC E5为隔离层膜材，Eudragit L30D-55为肠溶层膜材，采用流化床包衣法制备盐酸青藤碱肠溶缓释微丸，并考察缓释层、隔离层和肠溶层包衣增重对药物释放的影响。结果：制备的肠溶缓释微丸在人工胃液中释放度<10%，人工肠液中缓慢释放8 h。结论：该制备工艺简单易行，重现性好，有望应用于工业化生产。     

泛昔洛韦缓释微丸的研制

以Eudragit RSPO和RLPO为缓释材料,采用流化床包衣技术制备了泛昔洛韦缓释微丸.采用单因素试验筛选了增塑剂种类及用量、抗黏剂粒度、Eudragit RSPO和RLPO的配比及老化时间.所得优化参数为两种包衣材料配比19∶1,增塑剂为10％聚乙二醇6000,抗黏剂为20％滑石粉(1250目),包衣增重25％,老化12h.所制缓释微丸在1.5 h(0.1 mol/L盐酸)、3h和8 h(pH 6.8磷酸盐缓冲液)的累积释放度分别为10％～30％、30％～70％和70％以上.药动学研究表明,本品与泛昔洛韦普通片相比具有明显的缓释特征.     

盐酸二甲双胍缓释微丸的制备及体外释放度考察

目的:制备盐酸二甲双胍(metformin hydrochloride,MH)缓释微丸,并考察其体外释药行为。方法:通过离心造粒法制得MH微丸,以乙基纤维素水分散体(Surelease),丙烯酸树脂水分散体(EudragitNE30D,RS30D)作为膜控释包衣材料,通过流化床包衣制备MH缓释微丸,并考察不同包衣材料、包衣增重、固化时间、释放介质对释放度的影响。结果:离心造粒制得微丸圆整度好,有一定强度,适合包衣,Surelease包衣增重11%时所得的缓释微丸在12 h具有明显的缓释效果,不受释放介质的影响,为零级释放,且12 h释放可以达到85%以上。释放机制主要是通过无孔膜扩散作用。结论:通过离心造粒并用Surelease包衣的MH缓释微丸缓释效果明显,且为零级释放。     

盐酸青藤碱缓释微丸的研制

目的制备盐酸青藤碱缓释微丸,并对其体外释药情况进行研究。方法采用离心造粒技术制备微晶纤维素空白丸核和盐酸青藤碱含药丸芯,以聚丙烯酸树脂Eudragit NE 30D为包衣液制成膜控缓释微丸,考察包衣增重、抗粘剂用量等因素对缓释微丸释放度的影响。结果通过单因素考察确定了包衣液处方,所制备的微丸具有明显的缓释特征,体外释药过程符合一级动力学模型。结论用聚丙烯酸树脂Eudragit NE30D作为包衣材料所得缓释微丸符合24 h缓释要求。     

盐酸文拉法辛缓释微丸的制备及体外释放度试验

目的制备盐酸文拉法辛缓释微丸,并对其体外释药行为进行研究。方法先用文拉法辛溶液对空白微丸进行上药,通过EC包衣制得速释微丸,然后用速释微丸为丸芯,用EudragitEudragitNE30D,水分散体为包衣材料制备缓释微丸,再将速释微丸和缓释微丸以1:2的比例混合得到最后的缓释微丸。并分别考察了包衣增重对体外释药行为的影响。结果对制备过程中不同阶段的微丸进行了体外释放研究,表明增重20%,速释微丸和缓释微丸以1:2的比例配比结果最为理想。结论盐酸文拉法辛缓释微丸具有较好的释药性能及良好的缓释效果。     

Preparation and in vitro/in vivo evaluation of sustained-release metformin hydrochloride pellets.

In this study, metformin hydrochloride (MH) sustained-release pellets were successfully prepared by centrifugal granulation. Seed cores preparation, drug layering, talc modification and coating of polymeric suspensions were carried out in a centrifugal granulator. Talc modification was performed before coating in order to overcome the high water solubility of metformin. The influence of surface modification by talc, the effects of Eudragit types and ratios, as well as the correlation between in vitro release and in vivo absorption were investigated in detail. Experimental results indicated that talc modification made a decisive contribution to controlling the drug release by avoiding drug dumping. Three dissolution media: 0.1 M HCl, distilled water and pH 6.8 phosphate buffer were employed to determine the in vitro release behaviors of the above metformin hydrochloride pellets. The relative bioavailability of the sustained-release pellets was studied in 12 healthy volunteers after oral administration in a fast state using a commercially available immediate release tablet (Glucophage) as a reference. Following coating with a blend of Eudragit L30D-55 and Eudragit NE30D (1:20), at 7% or 10% coating level, respectively (referred to as F-2, F-3), the pellets acquired perfect sustained-release properties and good relative bioavailability. The Cmax, Tmax and relative bioavailability for F-2 and F-3 coated pellets were 1.21 microg/ml, 6 h, 97.6% and 1.65 microg/ml, 8 h, 165%, respectively. Combined use of two Eudragit polymers with different features as coating materials produced the desired results. Restricted delivery of metformin hydrochloride to the small intestine from differently coated pellets resulted in increased relative bioavailability and a sustained release effect. The adoption of several different pH dissolution media established a better relationship between the in vitro release and in vivo absorption of the sustained-release pellets.     

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。     

Design and study of ibuprofen disintegrating sustained-release tablets comprising coated pellets.

One challenge in tableting of sustained-release multiparticulates is maintaining the desired drug release after compaction. The aim of this study was to design sustained-release ibuprofen tablets which upon oral ingestion rapidly disintegrate into sustained-release pellets in which the integrity of the pellet core and/or coat is preserved. First free films composed of Eudragit RS 30D and RL 30D in 4:1 ratio and containing different levels of triethyl citrate (TEC) were prepared and tested to optimize the plasticizer level. Cured Eudragit based pellets with 60% ibuprofen loading which in our previous study showed proper mechanical properties for compression were coated with Eudragit RS 30D/RL 30D (4:1) containing 20% triethyl citrate at different coating levels. The mechanical properties of the coated pellets were tested. Polymer coated pellets were compacted into tablets either alone or with a blend of excipients comprising Avicel, PEG 4000, cross-linked PVP. A 3(2) full factorial design was used to optimize the filler blend composition. Effects of pellet to filler ratio, compression force and granulation of filler on tablet characteristics were investigated. Results of mechanical test showed that the coating of cured pellets had no significant effect on yield point and elastic modulus of the pellets. In the case of 5% coating level sustained release of ibuprofen over a period of 24h was achieved. The results obtained from tableting procedure showed that by selecting suitable filler blend (60% Avicel, 10% cross-linked PVP and 30% PEG 4000), compression force, and granulation of filler it was possible to prepare sustained-release tablets containing high ratio of coated pellets (even 80%) with desirable strength, disintegration time, and drug release rate. It was observed that compression force, pellet to filler ratio, composition of filler blend and granulation of fillers had no effect on drug release rate from compacted pellets but had significant influence on tablet strength, friability, and disintegration time. SEM graphs and in vitro release profiles for compacted pellets showed no apparent damage to the coated pellets as a result of the compaction process.