扑热息痛缓释微丸的制备

目的制备扑热息痛缓释微丸,并对其体外释药情况进行研究。方法采用挤出滚圆法制备扑热息痛素丸,在流化床内采用丙烯酸树脂水分散体对其包衣,制备扑热息痛缓释微丸。用释放度测定法考察影响药物释放的各种因素,对包衣微丸体外释药机理进行研究。结果包衣材料为丙烯酸树脂NE30D(Eudragit NE30D),质量分数增加6%时包衣微丸在pH 6.18的磷酸盐缓冲液中呈现良好的缓释效果,体外释药过程基本符合Higuchi方程:Y=31.213t1/2+0.425(r=0.993 2)。结论采用挤出滚圆法和丙烯酸树脂流化床包衣,成功地制备了扑热息痛缓释微丸,其体外释药缓慢、持续平稳。     

对乙酰氨基酚缓释微丸的制备及释放度研究

目的制备对乙酰氨基酚缓释微丸,考察包衣处方等因素对微丸释放度的影响。方法采用离心-造粒法制备微晶纤维素空白丸核和对乙酰氨基酚微丸,并在此基础上采用甲基丙烯酸树脂(Eudragit RS30D/RL30D)包衣,制备对乙酰氨基酚缓释微丸。采用HPLC法测定对乙酰氨基酚缓释微丸释放度,单因素筛选包衣处方的优化参数。结果以Eudragit RS30D/RL30D比例为15:1(w/w),包衣增重为10%,柠檬酸三乙酯占包衣材料量的25%,滑石粉占包衣材料量的40%为包衣液,制备的对乙酰氨基酚释微丸释药曲线具有较好的缓释特性。结论制备的对乙酰氨基酚缓释微丸具有缓释特性且操作简便、工艺稳定。     

磷酸川芎嗪丙烯酸树脂水分散体包衣小丸的体外释放研究

目的：研究磷酸川芎嗪丙烯酸树脂水分散体包衣缓释小丸的体外释药。方法：采用丙烯酸树脂RS30D和丙烯酸树脂RL30D混合液包衣制备磷酸川芎嗪缓释小丸，并考察包衣混合液中两种丙烯酸树脂水分散体比例、包衣增重、溶出介质pH对磷酸川芎嗪包衣制剂体外释药的影响。结果：随着包衣液中丙烯酸树脂RL30D/丙烯酸树脂RS30D比例增大、包衣增重降低、溶出介质pH增大，释药速率加快。结论：包衣液中丙烯酸树脂RL30D/丙烯酸树脂RS30D比例、包衣增重、溶出介质pH均显著影响制剂药物释放。     

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。     

酒石酸美托洛尔延迟起释缓释微丸的制备

目的制备酒石酸美托洛尔延迟起释缓释微丸;研究该制剂的体外释放影响因素。方法采用挤出滚圆法制备含药丸芯,以丙烯酸树脂(Eudragit NE 30D)为内层包衣材料,乙基纤维素与丙烯酸树脂(Eudragit L100)的混合膜材为外层包衣材料制备延迟起释缓释微丸。通过改变内层包衣质量增加、外层包衣质量增加及外层包衣液中乙基纤维素与Eudragit L 100的质量比来达到一定时滞后缓慢释放药物的目的。考察了处方因素和溶出条件对体外释放度的影响。结果制得时滞为4 h,4、6、10、14 h的累积释放量分别为<10%、20%~35%、50%~70%、≥75%的延迟起释缓释微丸。结论内层包衣质量增加、外层包衣液中乙基纤维素与Eudragit L100的比例及外层包衣质量增加对延迟起释缓释微丸的释药时滞和释药速率具有显著影响,药物的体外释放情况不受溶出转速和溶出装置的影响。     

厄贝沙坦缓释微丸的制备及体外释药特性的考察

目的制备厄贝沙坦缓释微丸,并对其体外释放度进行考察。方法采用流化床包衣技术,以丙烯酸树脂类Eudragit NE30D和Eudragit L30D-55混合水分散体为包衣材料,制备缓释微丸。考察不同释放介质、转速对其体外释药行为的影响。结果优化后的包衣处方为Eudragit NE30D/Eudragit L30D-55的比例为4︰1,抗粘剂和致孔剂的用量分别为聚合物干重的75%及20%,增重10%,熟化24h,释放介质的p H值对微丸释药的影响最明显,其体外释药过程符合一级释药模型。结论成功制备了厄贝沙坦缓释微丸,经考察其释放度符合要求。     

盐酸二甲双胍1000mg缓释片的制备及其体外释药机制考察

目的:制备1000mg规格的盐酸二甲双胍缓释片,考察其体外释药行为并与吡格列酮二甲双胍缓释片(Actoplus MetXR)中的二甲双胍缓释部分比较。方法:用亲水骨架结合缓释膜包衣技术制备盐酸二甲双胍缓释片,以羟丙甲纤维素(HPMC)K100M为片芯缓释材料,以丙烯酸树脂(尤特奇)NE30D为缓释包衣膜,以ActoplusMetXR中的二甲双胍缓释部分(规格:1000mg)为对照药,以两者体外释放曲线比较的相似因子(f2)为考察指标,采用星点设计-效应面法优化处方,同时考察最佳处方的体外释药机制。结果:最佳处方为片芯HPMCK100M/盐酸二甲双胍为0.15(m/m)、缓释膜HPMCE6/尤特奇NE30D为0.18(m/m)、包衣增质量控制在4%～6%;缓释片体外释放行为符合Higuchi方程(r=0.9954),以扩散机制为主,类似骨架系统释药。结论:盐酸二甲双胍1000mg缓释片可以达到与对照药相似的体外释药行为。     

甲硝唑缓释微丸的研制

目的制备甲硝唑缓释微丸,并对其体外释药行为进行研究。方法采用离心造粒技术制备甲硝唑丸;并在此基础上,在流化床内采用丙烯酸树脂水分散体对其进行包衣,制备甲硝唑缓释微丸。分别考察包衣材料的比例及用量对甲硝唑缓释微丸体外释药行为的影响。结果包衣材料EudragitNE30D与EudragitL30D-55质量比为1∶1、增重8%时,甲硝唑缓释微丸在模拟人体胃肠道的pH溶液中释放较理想。结论采用离心造粒技术和丙烯酸树脂流化床包衣,成功地制备了甲硝唑缓释微丸,它具有良好的缓释效果。     

克拉霉素缓释包衣微丸的制备及体外释放度研究

目的制备克拉霉素缓释包衣微丸,并对其体外释放度进行考察。方法采用挤出滚圆技术制备克拉霉素含药微丸。以优化的丙烯酸树脂类Eudragit NE30D和Eudragit L30D-55混和水分散体为包衣材料,采用流化床包衣技术,制备缓释包衣微丸。考察自制缓释微丸的体外释药速率,并与市售的克拉霉素缓释胶囊进行比较。结果通过释药行为的评价,得到优化的包衣处方为5∶1的Eudragit NE30D和Eudragit L30D-55混和包衣材料,其体外释放行为在不同的pH溶出介质中与市售制剂产品没有明显差异,体外释药过程符合一级释放模型。结论采用挤出滚圆和流化床技术,以及优化的Eudragit NE30D和Eudragit L30D-55混和水分散体包衣材料,成功制备了克拉霉素缓释包衣微丸。     

非诺贝特缓释微丸的制备及释放度研究

目的：制备非诺贝特缓释微丸。方法：采用BZJ-360M离心包衣造粒机制备微晶纤维素空白丸核和非诺贝特含药素丸，并在此基础上进行丙烯酸树脂水分散体（Eudragit NE 30D）包衣。用释放度测定法考察影响药物释放的各种因素，对包衣微丸体外释药机制进行研究。结果：包衣材料为Eudragit NE 30D，增重3％时包衣微丸呈现良好的缓释效果，体外释药过程基本符合Higuchi方程：Q=0．436＋30．316t^1/2／（r=0．9997）。结论：成功的制备了非诺贝特缓释微丸。     

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。     

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。     

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。     

离心造粒法制备托拉塞米缓释小丸胶囊及其释放度考察

目的:制备托拉塞米缓释小丸胶囊。方法:采用离心造粒粉末层积法制备托拉塞米小丸,用丙烯酸树脂水分散体包衣,并对包衣小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80.2%,含药素丸20～24目收率约87.6%,使用Eudragit NE30D包衣液,包衣增重10%。托拉塞米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、圆整度高的托拉塞米缓释小丸。     

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.     

阿昔洛韦缓释微丸的研制

目的制备阿昔洛韦缓释微丸,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阿昔洛韦素丸,在流化床内采用丙烯酸树脂水分散体对其包衣,制备阿昔洛韦缓释微丸。对包衣材料种类、配比及用量进行选择,对包衣微丸体外释药机理进行研究。结果包衣材料EudragitNE30D与L30D-55质量比为12∶1、增重8%时包衣微丸在pH6.8的磷酸盐缓冲液中呈现良好的缓释效果,体外释药过程基本符合Higuchi方程:Y=0.405+30.021t(r=0.9912)。结论采用离心造粒技术和丙烯酸树脂流化床包衣,成功地制备了阿昔洛韦缓释微丸,其体外释药缓慢、持续、平稳。     

复方盐酸伪麻黄碱缓释微丸的制备及其释放度考察

目的制备含萘普生钠和盐酸伪麻黄碱的复方缓释微丸,考察理论聚合物包覆量、抗黏剂用量、热处理时间等因素对盐酸伪麻黄碱缓释微丸释放度的影响。方法采用挤出滚圆法制备萘普生钠速释微丸及盐酸伪麻黄碱含药丸芯,采用丙烯酸树脂水分散体(EudragitRS 30D)流化床包衣技术制备盐酸伪麻黄碱缓释微丸,采用紫外分光光度法测定萘普生钠的含量及溶出度,采用HPLC法测定盐酸伪麻黄碱的含量及释放度。结果萘普生钠、微晶纤维素、硫酸钠质量比为10∶9∶1时,制得的萘普生钠速释微丸圆整度好,脆碎度低,10 min累积释药大于90%;当盐酸伪麻黄碱缓释微丸的理论聚合物包覆量为50%、滑石粉用量为聚合物质量的40%、热处理时间为24 h时,药物释放过程接近零级释药模型。结论所制备的萘普生钠速释微丸及盐酸伪麻黄碱缓释微丸体外释药均符合速释和缓释要求,后者的体外释药过程接近零级释药模型。     

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.