五加生化缓释片的制备及体外释放度的研究

目的：筛选五加生化缓释片的最佳制备工艺,并进行体外释放度研究。方法采用正交试验法筛选处方;以羟丙甲基纤维素（HPMC）为骨架材料,制备五加生化缓释片,并对优化的试验结果进行体外释放效果考察。结果最优处方为HPMC K100M为骨架材料,70%乙醇为黏合剂,MCC为填充剂用量40 mg,淀粉为填充剂用量50 mg,采用最佳工艺制备的五加生化缓释片体外释放性能较好,HPMC的规格对药物的释放影响最大。结论本法制备的缓释片比普通片具有明显的缓释作用。该制备工艺简单易行,生产成本低,片剂外观及可压性良好。     

多索茶碱HP MC骨架片的药物释放影响因素研究

以HPMC为骨架材料 ,将多索茶碱制成缓释骨架片 ,考察HPMC种类、用量及粒径 ,填充剂种类及用量和制备工艺对多索茶碱缓释片体外释药速率的影响 .结果表明 :多索茶碱缓释骨架片的体外释药行为符合Higuchi方程 ,HPMC的种类、用量、粒度 ,填充剂的用量对多索茶碱的体外释药速率均有较明显的影响 ;亲水性填充剂的种类对释药速率影响不大 ;湿法制粒所得骨架片的释药速率比干法直接压片有所减慢 ;压片力的大小对释药速率也有一定的影响 .     

氢溴酸高乌甲素亲水凝胶骨架片的制备及体外释放

目的为了减少给药次数,方便患者,并提高镇痛效果,制备氢溴酸高乌甲素亲水凝胶骨架片,优化制剂处方,并探讨释放机制。方法以羟丙甲纤维素(HPMC)为骨架材料,乳糖、微晶纤维素(MCC)、淀粉为填充剂,硬脂酸镁为润滑剂制备氢溴酸高乌甲素骨架片,考察各因素对药物释放度的影响,筛选优化处方,并拟合讨论其释放机制。结果 HPMC的用量及分子量,微晶纤维素和硬脂酸镁的用量对药物释放有显著影响。所制缓释片无突释现象,缓释周期12 h,根据拟合方程,药物释放符合一级释放模型,其释放既有扩散,又有骨架溶蚀。结论本方法制备的氢溴酸高乌甲素缓释片工艺简单,生产成本低,且具有良好的释放性能。     

鱼腥草素钠缓释片的制备及体外释放特性研究

目的制备鱼腥草素钠缓释片,并考察其体外释放特性。方法分别采用羟丙基甲基纤维素（HPMC）、联合应用HPMC与乙基纤维素（EC）作为骨架材料制备鱼腥草素钠缓释片,以累积释放度为指标,评价其体外释放特性。结果HPMC黏度及用量、EC用量对药物的释放有较大影响,填充剂对药物的释放几乎无影响。缓释片释药结果符合Higuchi方程。结论所制备的鱼腥草素钠缓释片缓释性能良好,其释放机制为非Fick’s扩散。     

齐墩果酸缓释片的研制及体外释放度考察

目的：制备齐墩果酸缓释片并考察其体外释放度。方法：以羟丙基甲基纤维素（HPMC）为缓释骨架材料，加淀粉和乳糖作填充剂。通过正交设计优化处方，并考察制剂大小，硬度，释放介质，pH及转速等因素对缓释片体外释放度的影响。结果：正交设计获最优处方为A2B3C1。即亲水凝胶骨架材料为HPMC（K4M），用量为30％。淀粉与乳糖的比例为1：1。药物体外释放行为符合Higuich方程。结论：该方法制得的缓释片具有良好的缓释效果。且制备工艺简单易行。     

纳豆激酶缓释片的制备及药物释放影响因素的研究*

目的：制备纳豆激酶缓释片并研究其体外释药影响因素。方法：采用直接压片法制备纳豆激酶缓释片，研究了不同骨架材料、HPMC用量、PVP用量、不同稀释剂、MCC用量对纳豆激酶缓释片体外释药速率的影响。结果：骨架材料和稀释剂的种类对药物释放有明显影响，释药速率随着HPMC和PVP用量的增加而减慢，而MCC用量的增加可加快药物的释放。结论：以HPMC与PVP作为混合骨架材料、MCC作为稀释剂，具有良好的缓释效果，HPMC,PVP和MCC的用量是影响药物释放速率的重要因素。     

西罗莫司缓释片的制备及其释药因素考察

目的制备西罗莫司缓释片并对其释药因素进行考察。方法采用羟丙基甲基纤维素（HPMC）为基本骨架材料制备了西罗莫司凝胶骨架片,对影响释药的因素,如采用羟丙基甲基纤维素（HPMC）规格、用量、填充剂种类、致孔剂用量、压片压力及释放介质等进行了考察。结果以30%羟丙基甲基纤维素（HPMC K4M）为骨架材料、2%乳糖为致孔剂、微晶纤维素（MCC）为填充剂时,缓释片呈明显一级释放特征。结论该制剂在体外具有良好的缓释效果,且制备工艺简单易行。     

马来酸氟吡汀缓释片的研制及体外释放特性考察

目的：采用羟丙甲基纤维素（HPMC）作为亲水凝胶骨架材料,制备马来酸氟吡汀缓释片,并考察其体外释放特性。方法：通过单因素试验,分剐考察了HPMC、乳糖用量对马来酸氟吡汀缓释片释放速率的影响;以体外释放度为评价指标优选处方的最佳组成和比例。结果：马来酸氟吡汀缓释片的释放速度随处方中HPMC含量增加而减慢,随乳糖用量增多而加快;释放介质对马来酸氟吡汀的释放速率也有明显影响,而释放度测定方法、转速对马来酸氟吡汀缓释片的释放速率无明显影响。结论：本品处方组成合理,制备工艺稳定。制备的马来酸氟吡汀缓释片,体外释药曲线显示有明显的缓释作用,属于零级释放。     

辛伐他汀缓释片制备及体外释放研究

目的制备辛伐他汀凝胶骨架缓释片,对影响药物释放的因素进行考查。方法采用紫外分光光度法测定其体外释放度,应用湿法制粒压片法制备缓释片,以羟丙基甲基纤维素（HPMC）为骨架材料,考察了HPMC规格、用量及其它辅料对药物释放的影响,并进行了正交实验优化及处方和制备方法的验证。结果辛伐他汀缓释片的体外释放受HPMC规格、HPMC用量、粘合剂种类的影响,选择HPMC（K15M）为骨架材料,其与主药质量比为1.5∶1,所制缓释片能持续释药12 h,批间重现性良好。结论该制剂处方合理,制备方法可行,具有良好的缓释效果。     

4-氨基吡啶凝胶骨架缓释片的制备及体外释放

目的:制备4-氨基吡啶(4-aminopyridine,4-AP)亲水凝胶骨架缓释片。方法:以羟丙甲纤维素的规格、处方用量及乳糖处方用量为因素设计正交试验,以体外释放度为考察指标,优化4-AP凝胶骨架片的处方,并进行批内和批间体外释放度验证试验。采用Origin软件对筛选出的最优处方释放度进行Weibull曲线拟合。考察体外释放条件对药物释放的影响。结果:优化处方为HPMC规格为K100LV,处方用量为54%,乳糖的处方用量为16%。所制得4-AP凝胶骨架片可持续释药12 h,批内释放均一性及批间重复性均良好。Weibull模型拟合方程得出药物释放符合一级速率过程。体外释放条件考察结果表明,转速对药物的释放有影响,而释放介质的种类和测定装置则无显著性影响。结论:所选4-AP凝胶骨架缓释片制备工艺可行,重复性好,有明显的缓释特性。     

氢氯噻嗪HPMC骨架片释药机制影响因素研究

目的研究影响HPMC骨架释药机制的因素。方法以氢氯噻嗪为模型药物,HPMC为骨架材料,制备缓释片,测定释放度并描述其释放机制。考察各处方因素和释放条件对释放机制的影响。结果 HPMC用量越大、难溶性填充剂,释放机制越趋向于零级释放。较低的HPMC用量、水溶性填充剂,释放机制趋向于Higuchi和Peppas方程,释药行为以溶蚀和扩散相结合。结论 HPMC型号、片剂的硬度、制备方法、溶出度测定方法、转速对释放机制影响不大。HPMC用量、填充剂的性质、溶出介质的离子强度影响释放机制。     

Once-daily propranolol extended-release tablet dosage form: formulation design and in vitro/in vivo investigation.

The purpose of this study was to develop and optimize the propranolol once-daily extended release formulations containing HPMC, Microcrystalline cellulose (MCC) and lactose. In vitro studies, the response surface methodology and multiple response optimization utilizing the polynomial equation were used to search for the optimal formulation with specific release rate at different time intervals. The constrained mixture experimental design was used to prepare systematic model formulations, which were composed of three formulation variables: the content of HPMC (X(1)) MCC (X(2)) and lactose (X(3)). The drug release percent at 1.5, 4, 8, 14 and 24 h were the target responses and were restricted to 15-30, 35-55, 55-75, 75-90 and 90-110%, respectively. The results showed that the optimized formulation provided a dissolution pattern equivalent to the predicted curve, which indicated that the optimal formulation could be obtained using response surface methodology. The mechanism of drug release from HMPC matrix tablets followed non-Fickian diffusion. In the vivo study, the MRT was prolonged for matrix tablets when compared with commercial immediate release tablets. Furthermore, a linear relationship between in vitro dissolution and in vivo absorption was observed in the beagle dogs.     

琥珀酸 S-美托洛尔缓释片的研制及体外释放特征探讨

目的：研制琥珀酸S-美托洛尔24 h缓释片,考察其体外释放特征,并对其体外释放机制进行初步研究。方法以羟丙基甲基纤维素（ HPMC）为骨架材料制备缓释片,以单因素试验法对缓释片释放因素进行考察,采用正交试验设计选择最佳处方,并对优化处方的释药机制进行探讨。结果最优处方以K100M和K15M规格HPMC的混合物作为骨架材料,质量分数各占总质量的20％,微晶纤维素为填充剂,质量分数占总质量的50％。制备的琥珀酸S-美托洛尔缓释片释放规律符合Ritger-Peppas方程曲线,释药行为是药物扩散和骨架溶蚀协同作用。结论琥珀酸S-美托洛尔缓释片处方合理,有良好的24 h体外释药行为,处方工艺基本满足设计要求。     

The Impact of Dose and Solubility of Additives on the Release from HPMC Matrix Tablets—Identifying Critical Conditions

Purpose  The dissolution of HPMC matrix tablets containing different amounts of highly soluble (mannitol) or poorly soluble (dicalcium phosphate, DCP) was studied to deduce the parameters critical to release robustness. Methods  The release of HPMC and additives was studied using a modified USP II method at two paddle stirring rates, 50 and 125 rpm, at HPMC content varying from 15% to 100%. Results  At HPMC contents between 30% and 35% a critical point was identified and found crucial to the release from the HPMC/mannitol tablets. Below this point the matrix rapidly disintegrated in a non robust manner. At higher HPMC contents the mannitol release became increasingly diffusion controlled with maintained matrix integrity. The release robustness was lower for HPMC/DCP than HPMC/mannitol tablets at high HPMC contents, however, lacking critical points. The critical point was interpreted as the percolation threshold for HPMC and differences explained in terms of water transport into the matrix. Conclusion  The release robustness was lower for formulations with additives of low solubility having an erosion controlled release than for additives with higher solubility and a diffusion controlled release. However, for additives creating a steep osmotic pressure gradient, an HPMC content above the percolation threshold becomes vital for maintaining the release robustness.     

以HPMC为骨架的盐酸丁螺环酮缓释片的制备

以HPMC单用或与卡波姆934p合用，制备盐酸丁螺环酮缓释片并进行体外释放度的测定。结果表明本品可持续释药24h，且加入卡波姆比单用HPMC为骨架具有更好的缓释效果。     

卡托普利缓释片的实验研究

采用羟丙基甲基纤维素(HPMC)凝胶制备的巯甲丙脯酸(卡托普利)缓释片,其体外释放曲线符合 Higuchi 动力学。HPMC 在片剂中含量达到30%以上才能控制巯甲丙脯酸的释放。HPMCK_4M、K_(15)M和 K100M 的粘度差异对凝胶片释放并无影响,释放介质的 pH 及压片压力对该制剂的药物释放影响不大。     

羟丙基甲基纤维素的凝胶特性及其对曲尼司特缓释片释放行为的影响

目的：研究羟丙基甲基纤维素(HPMC)的凝胶特性及其对曲尼司特缓释片释放行为的影响。方法：采用称重法、图像法和体积测量法,研究HPMC辅料片和曲尼司特缓释片在不同pH环境中的水合度和溶胀度。结果：辅料片在SGF和SIF中的水合速率常数分别为0.897 h-1和0.681 h-1;溶胀速率常数分别为1.005 h^-1和0.713 h^-1。曲尼司特缓释片在SGF中,在0.5 h内迅速水合和溶胀,其后呈负增长;而在SIF中,重量和体积都缓慢增加,5 h后重量稍有下降,体积保持不变。结论：HPMC水凝胶的形成速度和形态与介质的pH有关,凝胶层的溶蚀速度控制药物的释放。     

Optimization of sustained-release propranolol dosage form using factorial design and response surface methodology

The purpose of this study was to develop propranolol extended release formulations containing hydroxypropylmethylcellulose (HPMC). The results indicate that the drug release from the tablet form containing a high amount of HPMC was incomplete, and avicel addition could increase the release percent at a later stage. In order to readily obtain an optimal formulation, response surface methodology and multiple response optimization utilizing a quadratic polynomial equation was used. The model formulations were prepared according to a factorial design. The effects of causal factors including the HPMC/drug ratio (X1) and avicel level (X2), on drug release were also measured. The drug release percentage at 1.5, 4, 8, 14 and 24 h were the target response and were restricted to not more than 25%, 35-50%, 55-70%, 75-90%, and 95-110%, respectively. The results showed that the optimized formulation provided a dissolution pattern equivalent to the predicted curve, which indicated that the optimal formulation could be obtained using response surface methodology. The mechanism of drug release from HMPC matrices tablets followed quasi-Fickian diffusion.     

盐酸地尔硫缓释片的制备及体外释放度

以羟丙基甲基纤维素为凝胶骨架材料 ,以淀粉 糊精混合物及乳糖为填充剂 ,采用湿法制粒压片 ,制备了盐酸地尔硫缓释片 ,并对其释放度进行了测定 .所制备的缓释片在释放 90 %之前的释放符合Higuchi方程 .片剂中羟丙基甲基纤维素的含量及稀释剂的种类与含量对药物的释放速度有较大影响 ,而压片力对药物的释放速度无明显影响 .改变缓释片中羟丙基甲基纤维素的含量及稀释剂的种类可改变药物的释放速度     

卡波姆71G和羟丙基甲基纤维素在氢氯噻嗪骨架缓释片中的应用

目的:以氢氯噻嗪为模型药物,卡波姆71G和羟丙基甲基纤维素(HPMCSH4000)为骨架材料制备氢氯噻嗪缓释片,并对影响其释放的因素进行考察.方法:以HPMCSH4000和卡波姆71G为亲水性骨架材料,湿颗粒法压片制备氢氯噻嗪缓释片,采用中华人民共和国药典2000年版二部收载的溶出度测定方法II(桨法),测定药物的体外释放度,以一级方程的相关系数(r),t30,t50和t75为指标进行处方筛选,并考察影响氢氯噻嗪释放的因素.结果:最优处方的r,t30,t50和t75符合实验要求,制备的缓释片释放曲线符合一级释放方程,卡波姆71G和HPMCSH4000的用量、压片压力、释放介质的pH值、桨法转速对药物的体外释放均有一定影响.结论:以卡波姆71G和HPMCSH4000为骨架材料,可以制备出具有理想释药的氢氯噻嗪骨架缓释片.