熔融高速搅拌法制备双氯芬酸钠缓释胶囊的研究

目的 研究熔融高速搅拌法制备双氯芬酸钠缓释胶囊及其体外释药行为。方法 采用KJZ-10型熔融高速搅拌制粒机制备含药微丸,以微丸体外释放度为指标,考察处方工艺因素对微丸体外释放度的影响,通过释放度曲线药动力学拟合确定微丸缓释机制。结果 双氯芬酸钠微丸体外释放行为符合Higuchi方程 Y=35.43t_1/2-16.152 3(r=0.998 8),释药机制主要是骨架溶蚀和扩散释放。结论 该技术制备的双氯芬酸钠缓释微丸具有较好的释药性能及良好的缓释效果。     

熔融高速搅拌法制备双氯芬酸钠缓释胶囊的研究

目的研究熔融高速搅拌法制备双氯芬酸钠缓释胶囊及其体外释药行为。方法采用KJZ-10型熔融高速搅拌制粒机制备含药微丸,以微丸体外释放度为指标,考察处方工艺因素对微丸体外释放度的影响,通过释放度曲线药动力学拟合确定微丸缓释机制。结果双氯芬酸钠微丸体外释放行为符合Higuchi方程Y=35.43t1/2-16.1523（r=0.9988）,释药机制主要是骨架溶蚀和扩散释放。结论该技术制备的双氯芬酸钠缓释微丸具有较好的释药性能及良好的缓释效果。     

双氯芬酸钠明胶微球的制备及体内外释药的研究

目的将双氯芬酸钠制备成明胶微球,考察其缓释效果。方法采用单凝聚法制备双氯芬酸钠明胶微球,并对微球的体内外释药进行考察。结果制备的微球粒径范围为48～100μm,平均粒径为70.70±11.29μm,载药量为35%。体内外释药实验结果表明双氯芬酸钠明胶微球有缓释作用。结论本法制备的双氯芬酸钠明胶微球能够起到明显缓释作用。     

聚氧乙烯骨架缓释片的处方及体外释药机制研究

目的 以聚氧乙烯(PEO)为亲水凝胶骨架制备缓释片剂,并考察其体外释药机制。方法 基于两种规格PEO的用量比与释药速率之间的关系,优化缓释片处方。通过考察片剂的体外释放度和溶蚀比探讨其释药机制,并对不同溶解度药物的体外释放行为进行比较。结果 缓释片体外释药速率与PEO用量比呈线性关系,所得优化处方在12 h内以接近恒速释药,其体外释药与溶蚀过程基本同步,且在所考察用量范围内不同溶解度药物的体外释放度相近。结论 PEO制成的亲水凝胶骨架片缓释性能良好,其体外释药是药物扩散和骨架溶蚀协同作用的结果。     

聚氧乙烯骨架缓释片的处方及体外释药机制研究

目的以聚氧乙烯（PEO）为亲水凝胶骨架制备缓释片剂,并考察其体外释药机制。方法基于两种规格PEO的用量比与释药速率之间的关系,优化缓释片处方。通过考察片剂的体外释放度和溶蚀比探讨其释药机制,并对不同溶解度药物的体外释放行为进行比较。结果缓释片体外释药速率与PEO用量比呈线性关系,所得优化处方在12h内以接近恒速释药,其体外释药与溶蚀过程基本同步,且在所考察用量范围内不同溶解度药物的体外释放度相近。结论PEO制成的亲水凝胶骨架片缓释性能良好,其体外释药是药物扩散和骨架溶蚀协同作用的结果。     

双氯芬酸钠/海藻酸钠微球的制备与体外释药行为考察

目的以海藻酸钠为载体材料,双氯芬酸钠为模型药物,制备载药微球并考察其性质及体外释放行为。方法本文采用海藻酸钠为药物载体,采用喷雾干燥法制备双氯芬酸钠/海藻酸钠微球。考察于双氯芬酸钠/海藻酸钠投料比对载药微球理化性质的影响。采用扫描电镜对所得到的微球进行形貌观察。同时考察其体外药物释放行为。结果所得到的载药微球形态呈不规则的扁平状,粒径分布较为均匀。通过控制投料比,可以得到不同粒径(5.64～9.58μm),载药量(5.76～18.43%)和包封率(35.45～43.92%)的载药微球。体外药物释放行为结果显示微球在含有0.5%氯化钙的PBS(pH=7.4)溶液的药物释放时间可以持续96h,具有一定的缓释效果。结论通过喷雾干燥法制备的双氯芬酸钠/海藻酸钠载药微球具有较高载药量和一定的药物缓释效果。     

骨形成蛋白2壳聚糖微球的制备

目的 探讨壳聚糖微球包裹人重组骨形成蛋白2(rhBMP-2)的制备方法 .方法 采用Berthold的沉淀/凝聚法制备壳聚糖微球,用此微球包裹rhBMP-2,对rhBMP-2壳聚糖微球的大小、形态、含量和体外释药进行研究.结果 空白壳聚糖微球表面光滑,粒径范围1.2～3.8 μm.载药量约为4.68X104 U/mg,包封率为91.8%.体外释放试验显示,壳聚糖微球释放rhBMP-2初期释药较快,尤其第1天有突释现象(累计释药度约占19.6%),随后释放速度逐渐变缓,第10天累计释放度约54.5%,第20天约64.4%.结论 rhBMP-2壳聚糖微球具有较高的包封率和显著的缓释rhBMP-2作用.     

替莫唑胺壳聚糖缓释微球的制备及体外释药特性

目的:制备替莫唑胺壳聚糖缓释微球,并对其体外释药模式进行研究.方法:以替莫唑胺为模型药物,采用乳化交联法制备壳聚糖微球,两步优化法优化处方和制备工艺.通过测定微球的粒径及其分布、载药量、包封率和体外释放速度对微球进行质量评价.结果:优化工艺制得的微球平均粒径为(3.9±1.6)μm,载药量为(7.1±0.5)%(n=3),包封率为(25.0±0.8)%(n=3),体外释药特性研究具有良好的缓释特性,在0～8 h符合Higuchi方程,Q=11.717 26.951t1/2(r=0.980),8～24 h符合一级释放曲线,lnQ=4.37 0.007 5t(r=0.983).结论:通过优化处方和制备工艺,采用乳化交联法可制备出以壳聚糖为载体、替莫唑胺为模型药物的缓释微球,其体外释药具有明显的缓释作用.     

左羟丙哌嗪缓释骨架片的制备及体外释药行为评价

［摘要］　目的：制备左羟丙哌嗪缓释骨架片,考察其体外释放度,探讨其释药机制。方法：以亲水性高分子材料HPMC为骨架,采用湿法制粒,制备左羟丙哌嗪缓释骨架片,评价不同pH值条件下的释放度,并将释放数据拟合方程。结果：HPMC用量增加,左羟丙哌嗪释放速度下降;溶出介质pH对药物的释放特性有一定影响。在本实验条件下,HPMC用量对水溶液中药物的释放机制无明显影响,释药过程符合Higuchi方程(R2=0.988 9~0.990 4)或一级方程(R2=0.987 5~0.990 2),释药机制为非Fickian扩散(n=0.615 3~0.633 9)。结论：左羟丙哌嗪缓释骨架片的体外释放符合缓释要求,释放表现为药物扩散和凝胶溶蚀的协同作用。     

挤出滚圆法制备吲哚美辛缓释微丸

目的:制备吲哚美辛(IMC)缓释微丸并考察其体外释放行为。方法:采用挤出滚圆法制备微丸,以微丸收率为考察指标,优选挤出速率、滚圆速度和滚圆时间参数水平;以体外释药曲线为考察指标,崩解剂微晶纤维素(MCC)、骨架材料羟丙甲基纤维素(HPMC)和润湿剂水的处方用量为因素,设计单因素试验筛选辅料处方,并进行处方验证试验及其释药机制研究。结果:优选的较佳工艺参数为挤出速度65r.min-1、滚圆速度650r.min-1、滚圆时间3min;优选的处方为MCC19、HPMC20、水6mL;验证试验表明所制得的IMC缓释微丸释放度重现性好且符合缓释制剂的要求,其释药机制为药物扩散和骨架溶蚀的混合型机制。结论:挤出滚圆法制备IMC缓释微丸方法可行,且制剂具有良好的体外缓释效果。     

双氯芬酸钠明胶微球的制备

目的：对双氯芬酸钠明胶微球的处方及制备工艺进行初步研究。方法：以生物降解材料明胶为载体,采用乳化交联法制备双氯芬酸钠明胶微球;单因素考察的基础上,利用正交实验设计筛选最佳处方和工艺;建立紫外分光光度法测定微囊中恩诺沙星的包封率和载药量的方法。结果：所制备的双氯芬酸钠明胶微球外形圆整,大小均匀,载药量为2.05%,包封率为37.67%。结论：获得较为满意的双氯芬酸钠明胶微球。     

非诺洛芬钙亲水凝胶缓释骨架片释药机理影响因素考察

研究了非诺洛芬钙亲水凝胶缓释骨架片释放机制的影响因素。通过对骨架材料的种类、型号及用量、填充剂的性质及用量、压片压力、制剂工艺等各因素对药物释放机制的影响考察发现 :骨架材料的种类及用量、填充剂的性质及用量和压片力对释药机制影响较大 ,其余因素影响较弱。     

Novel sustained release, swellable and bioadhesive gastroretentive drug delivery system for ofloxacin

Oral sustained release gastroretentive dosage forms offer many advantages for drugs having absorption from upper gastrointestinal tract and improve the bioavailability of medications that are characterized by a narrow absorption window. A new gastroretentive sustained release delivery system was developed with floating, swellable and bioadhesive properties. All these properties were optimized and evaluated. Various release retarding polymers like psyllium husk, HPMC K100M and a swelling agent, crosspovidone in combinations were tried and optimized to get the release profile for 24 h. Formulations were evaluated for in vitro drug release profile, swelling characteristics and in vitro bioadhesion property. The in vitro drug release followed Higuchi kinetics and the drug release mechanism was found to be of anomalous or non-Fickian type. For the developed formulation, the value of n was found to be 0.5766 while for the marketed formulation the value was 0.5718 indicating the anomalous transport. The high water uptake leading to higher swelling of the tablet supported the anomalous release mechanism of ofloxacin. The similarity factor f2 was found to be 91.12 for the developed formulation indicating the release was similar to that of the marketed formulation (Zanocin OD). The swelling properties were increased with increasing crosspovidone concentration and contributed significantly in drug release from the tablet matrix. The bioadhesive property of the developed formulation was found to be significant (P < 0.005) in combination as compared to HPMC K100M and psyllium husk alone.     

In vitro characterization and release study of Ambroxol hydrochloride matrix tablets prepared by direct compression

A series of either hydrophilic or hydrophobic polymers were used to prepare controlled release Ambroxol hydrochloride (AMX) matrix tablets by direct compression. Both the compatibility and flow properties of AMX/polymer mixtures were investigated. The effect of the amount and type of polymer on the physical properties and in vitro drug release was studied and compared to commercially available Ambroxol(?) SR capsules. A kinetic study of the release profile of AMX from the prepared matrix tablets was performed. All excipients used in the study were compatible with the model drug. AMX/drug mixtures containing sodium alginate (NA) and hydroxypropylmethyl cellulose (HPMC) showed better flow properties than other polymers used in the study. The in vitro drug release studies showed that matrix tablets formulae containing 10% HPMC (S7) or a combination of 30% NA and 5% HPMC (Ah) exhibited a higher ability to control the release of AMX. The kinetic study revealed that a diffusion controlled mechanism prevailed except when carbopol was used. Formula Ah followed a non-fickian diffusion mechanism similar to Ambroxol(?) SR capsules. Both formulae S7 and Ah could be considered as potential candidates for formulation of AMX controlled release matrix tablets.     

硫酸沙丁胺醇脉冲控释片的研制

目的:制备硫酸沙丁胺醇双层包衣脉冲片,考察处方及释放条件对体外释药行为的影响,解析其释放机理.方法:混合粉末直接压片,滚转包衣锅法分别包溶胀层和控释衣层.通过测定释放度研究脉冲片的制剂学特征.结果:双层包衣片以脉冲形式释放,释药时滞随控释衣层厚度增加而延长,释药速度减小;渗透压活性物质和溶胀层可提高快速释放期的释药速率.溶出介质pH值和搅拌速度对释药行为无影响.释药机理包括扩散、溶胀和渗透泵机理.结论:调整控释衣膜厚度和组成可获得理想的脉冲释药行为,满足时辰治疗的要求.本给药系统设计可推广应用于水溶性药物的脉冲给药系统研究.     

氨茶碱魔芋胶骨架片的释药机制研究

目的研究氨茶碱魔芋胶骨架片的体外释药机制。方法以氨茶碱为模型药物,采用粉末直接压片法制备氨茶碱魔芋胶骨架片,测定不同搅拌转速条件下骨架片的体外溶蚀度与释放度,分别采用零级方程和Peppas方程对释药过程中骨架片的溶蚀度和释放度数据进行处理。结果骨架片的溶蚀符合零级方程,溶蚀量随搅拌转速增加而增加;骨架片的药物释放为扩散和溶蚀协同作用,随搅拌转速增加或释药时间延长,骨架片释药过程中扩散释放所占比例下降,溶蚀释放所占比例增加。结论氨茶碱魔芋胶骨架片的释药机制为非Fick扩散,即药物扩散和骨架溶蚀协同作用。     

阿司匹林缓释胶囊的释放度与生物利用度研究

目的 :制备阿司匹林缓释胶囊 (A -SRC) ,并对其释放度与生物利用度进行研究。方法 :通过测定A -SRC的释放度 ,进行释放机制的研究 ;测定家兔体内血药浓度 ,研究A -SRC的相对生物利用度。结果 :A -SRC体外释放符合零级动力学过程。该制剂相对于其普通片剂释药稳定、生物利用度高。结论 :A -SRC缓释效果明显 ,给药后血药浓度较为平缓 ,持续作用时间长 ,可减少给药次数 ;由于A -SRC采用轻质辅料具漂浮性能 ,缓慢释药 ,因而有利于降低其对胃肠道的刺激性及其他不良反应。     

In vitro characterization and release study of Ambroxol hydrochloride matrix tablets prepared by direct compression

A series of either hydrophilic or hydrophobic polymers were used to prepare controlled release Ambroxol hydrochloride (AMX) matrix tablets by direct compression. Both the compatibility and flow properties of AMX/polymer mixtures were investigated. The effect of the amount and type of polymer on the physical properties and in vitro drug release was studied and compared to commercially available Ambroxol^® SR capsules. A kinetic study of the release profile of AMX from the prepared matrix tablets was performed. All excipients used in the study were compatible with the model drug. AMX/drug mixtures containing sodium alginate (NA) and hydroxypropylmethyl cellulose (HPMC) showed better flow properties than other polymers used in the study. The in vitro drug release studies showed that matrix tablets formulae containing 10% HPMC (S7) or a combination of 30% NA and 5% HPMC (Ah) exhibited a higher ability to control the release of AMX. The kinetic study revealed that a diffusion controlled mechanism prevailed except when carbopol was used. Formula Ah followed a non-fickian diffusion mechanism similar to Ambroxol^® SR capsules. Both formulae S7 and Ah could be considered as potential candidates for formulation of AMX controlled release matrix tablets.