汉黄芩素固体脂质纳米粒的制备及体外释放度考察

目的:制备汉黄芩素固体脂质纳米粒并对其体外释放度进行考察.方法:采用乳化分散-超声法制备汉黄芩素固体脂质纳米粒,以包封率和载药量为评价指标,进行正交试验筛选最优处方,并对最优处方的外观、粒径和体外释放度进行考察.结果:制得的纳米粒为均一球形,平均粒径为(153 ±34)nm,其平均载药量为(60.53±2.17)％,平均包封率为(85.54±4.16)％,48 h累积释放达80％.结论:本试验获得了较理想的汉黄芩素固体脂质纳米粒,其体外释放具有缓释作用.     

乳化蒸发法制备固体脂质纳米粒

目的：采用乳化蒸发法制备固体脂质纳米粒,并考察其载药性能。方法：对影响固体脂质纳米粒质量的工艺因素和处方因素进行考察和优化设计,得到最优处方。选用模型药物酮洛芬制备载药固体脂质纳米粒,考察其包封率和体外释放行为。结果：所得固体脂质纳米粒平均粒径为（228.2±18.1）nm,多分散系数为（0.217±0.022）,ξ电位为-（21.4±0.6）mV。载药固体脂质纳米粒最佳包封率为（64.1±3.3）%,体外释放行为符合Weibull模型。结论：采用乳化蒸发法制备固体脂质纳米粒是可行的。     

蓝萼甲素固体脂质纳米粒的制备工艺研究

目的以固体脂质纳米粒作为蓝萼甲素新型缓释给药系统,进行蓝萼甲素固体脂质纳米粒的制备工艺研究。方法采用乳化蒸发-低温固化法,均匀设计优化处方,按照优化工艺条件,以硬脂酸作为蓝萼甲素模型药物载体,制备得到蓝萼甲素固体脂质纳米粒,并对其包封率进行考察。结果本研究制得的蓝萼甲素固体脂质纳米粒的包封率达到80.4%。结论本研究方法可以作为蓝萼甲素固体脂质纳米粒的制备方法。     

蓝萼甲素固体脂质纳米粒的制备及理化性质研究

目的:制备蓝萼甲素固体脂质纳米粒,并对其理化性质进行研究。方法:用乳化-溶剂挥发法制得蓝萼甲素固体脂质纳米粒,并对其粒径、形态、表面电位、包封率、体外释药性质等进行研究。结果:所得蓝萼甲素固体脂质纳米粒的粒径分布均匀,平均粒径为(190±10·3)nm,Zeta电位为—31·2mV,平均包封率为(50·45±0·804)%;药物体外释放符合Higuchi线性方程,具有显著缓释作用。结论:固体脂质纳米粒可作为蓝萼甲素新型缓释给药系统。     

大黄素固体脂质纳米粒的制备及理化性质研究

目的：制备大黄素固体脂质纳米粒,并对其理化性质进行研究。方法：用乳化一溶剂挥发法制得大黄素素固体脂质纳米粒,并对其粒径、形态、表面电位、包封率、体外释药性质等进行研究。采用全体液平衡反向透析法研究体外释药性质。结果：所制固体脂质纳米粒外观形态圆整,粒度分布均匀,平均粒径为253nm,电位为一25．4mV,包封率为（56．31±2．06）％。药物体外释放符合Weibull线性方程。结论：固体脂质纳米粒可作为大黄素新型缓释给药系统。     

褪黑素固体脂质纳米粒的制备及理化性质

考察不同的处方对褪黑素固体脂质纳米粒粒径和包封率等理化性质的影响，并进行其体外释放实验。结果表明，以单硬脂酸甘油酯为脂质材料，乳化超声法制备固体脂质纳米粒，平均粒径为（62．4±1．5）nm，ζ电位为（-7．0±0．2）mV，平均包封率为（64．6±3．8）％；药物的体外释放符合Weibull模型。     

黄芩苷固体脂质纳米粒体外释放研究

目的:研究黄芩苷固体脂质纳米粒的体外释药规律。方法:采用动态透析技术研究黄芩苷固体脂质纳米粒的体外释药性能,并用高效液相色谱法测定黄芩苷含量,以累积释药百分率进行不同模型的拟合。结果:黄芩苷固体脂质纳米粒的释放曲线符合Hixon-crowell方程,t≈3h。结论:黄芩苷固体脂质纳米粒具有良好的缓释作用。     

长春西汀固体脂质纳米粒的制备及其性质考察

目的制备长春西汀固体脂质纳米粒,为长春西汀新型给药系统的开发与应用提供实验基础。方法以长春西汀为模型药物、山嵛酸甘油酯为载体材料,采用热熔超声法制备长春西汀固体脂质纳米粒,并通过正交试验设计对处方进行优化。以包封率为评价指标,对其形态、体外释放度、短期稳定性等性质进行了考察。结果制备的纳米粒为球形及类球形,粒径为152.3 nm,包封率为93.68%,72 h体外累积释放71.84%,4℃下放置2个月稳定。结论热熔超声法可用于制备长春西汀固体脂质纳米粒,该纳米粒具有明显的缓释特征,可进一步进行体内释药行为的考察。     

超临界辅助喷雾法用于固体脂质纳米粒的制备

目的采用超临界辅助喷雾制粒法制备固体脂质纳米粒,并考察工艺与处方因素对纳米粒理化性质的影响。方法采用自制超临界喷雾制粒设备,制备硬脂酸脂质纳米粒,考察硬脂酸浓度、超临界流体CO2与载体溶液流量比、喷嘴孔径等对固体脂质纳米粒粒径的影响,筛选合适的处方工艺参数;以亲水性大分子药物胰岛素为模型药物,制备载药固体脂质纳米粒,评价纳米粒的粒径、电位、包封率、释放度等理化性质。结果制备得到的纳米粒粒径与载体浓度、超临界流体CO2与载体溶液流量比、喷嘴孔径有关,通过处方工艺的调节,可制得平均粒径〈300nm的固体脂质纳米粒;制得的胰岛素固体脂质纳米粒的平均粒径约300nm,包封率72．2％,载药量为3．44％,载药纳米粒在体外可实现12h缓慢释放;处方中加入泊洛沙姆可减小纳米粒粒径和粒度分布,但药物的包封率降低,并且突释现象更明显。结论超临界辅助喷雾制粒法可用于固体脂质纳米粒的制备,并能够对亲水性药物实现有效的包封和释放的调节。     

黄豆苷元固体脂质纳米粒的制备及其性质考察

目的制备黄豆苷元固体脂质纳米粒并考察其性质。方法采用正交实验法优化黄豆苷元固体脂质纳米粒的最佳处方,并测定黄豆苷元固体脂质纳米粒的粒径、ζ电位、包封率、稳定性和累积释放百分率。结果黄豆苷元固体脂质纳米粒的最佳处方组合为：单硬脂酸甘油酯用量为2.0%,黄豆苷元用量为2.0 mg.mL-1,豆磷脂的用量为0.4%,Pluronic F68的用量为1.2%。所制得的纳米粒包封率为84.7%、平均粒径为170 nm、ζ电位为-35.8 mV、72 h累积释放百分率为90.3%。结论新制黄豆苷元固体脂质纳米粒的粒度分布范围窄,包封率较高,稳定性良好。     

Fabrication and Evaluation of Curcumin-loaded Nanoparticles Based on Solid Lipid as a New Type of Colloidal Drug Delivery System

Curcumin has very broad spectrum of biological activities; however, photodegradation, short half-life and low bioavailability have limited its clinical application. Curcumin-loaded solid lipid nanoparticles were studied to overcome these problems. The aim of this study was to optimize the best formulation on curcumin-loaded solid lipid nanoparticles. Emulsion-evaporation and low temperature-solidification technique was applied with monostearin as lipid carriers. The single factor analysis and orthogonal design were used to optimize formulation and various parameters were investigate. By the optimisation of a single factor analysis and orthogonal test, the particles size, polydispersity index, zeta potential, encapsulation efficiency and drug loading capacity of the optimised formulation were 99.99 nm, 0.158, −19.9 mV, 97.86%, and 4.35%, respectively. The differential scanning calorimetry and X-ray diffraction analysis results demonstrated new structure was formed in nanoparticles. The release kinetics in vitro demonstrated curcumin-loaded solid lipid nanoparticles can control drug release. These studies confirmed that curcumin-loaded solid lipid nanoparticles could be prepared successfully with high drug entrapment efficiency and loading capacity. Curcumin-loaded solid lipid nanoparticles may be a promising drug delivery system to control drug release and improve bioavailability.     

香叶木素固体脂质纳米粒的制备及质量评价

目的 制备香叶木素固体脂质纳米粒并对其进行质量评价。方法 采用溶剂注入法制备香叶木素固体脂质纳米粒,用 Box-Benhnken效应面法优化处方,并通过包封率、微观形态、粒径分布和Zeta电位对香叶木素固体脂质纳米粒的质量进行评价。 结果 香叶木素固体脂质纳米粒最优处方组成：表面活性剂浓度3.39%,棕榈酸浓度0.116%,脂药质比为21:100,制备的香叶木素 固体脂质纳米粒外观澄清透明,带淡蓝色乳光;平均粒径为(91.73±3.18)nm(n=3),PDI为0.228,电位为(-11.46±0.74)mV(n=3);包 封率为95.13%,载药量为9.04%;透射电镜照片显示纳米粒大小均一,呈球形或类球形。 结论 该处方可用于香叶木素固体脂 质纳米粒的制备,工艺简单,稳定可行。     

柚皮苷固体脂质纳米粒包封率及体外释放度测定

目的：建立柚皮苷固体脂质纳米粒（solid lipid nanoparticles,SLN）的包封率和体外释放度的测定方法。方法：采用超滤法和高效液相色谱法测定柚皮苷SLN包封率。通过透析袋法测定柚皮苷SLN的体外释放度。结果：柚皮苷在2．5—160．0μg·ml^-1范围内,线性关系良好（r=0．9999）。平均回收率为99．9％,RSD为1．1％。透析袋对柚皮苷没有吸附作用。柚皮苷SLN包封率为61．3％,体外释药曲线符合一级动力学方程。结论：所建立的方法简单可靠。     

异甘草素固体脂质纳米粒包封率测定方法的研究

目的:建立异甘草素固体脂质纳米粒(ISO-SLN)包封率测定方法。方法:采用透析法分离样品中的游离药物及载药固体脂质纳米粒,并确定透析介质和透析时间;紫外分光光度法测定包封率,检测波长为396nm。结果:以2%泊洛沙姆188水溶液为透析介质、透析时间为8h,能有效分离ISO-SLN与游离ISO,加样回收率大于95%;ISO检测浓度线性范围为1.12～7.84μg·mL-1(r=0.9995),低、中、高浓度平均回收率为99.54%、99.11%、100.2%,RSD均小于5%;3批ISO-SLN平均包封率为80.2%。结论:所建立的方法可用于测定ISO-SLN包封率,且方法准确、简便。     

依托泊苷固体脂质纳米粒的研制

目的:制备依托泊苷固体脂质纳米粒(ET-SLN)并考察其药剂学性质。方法:采用乳化-超声分散法制备ET-SLN,以单硬脂酸甘油酯(A)、大豆磷脂(B)、泊洛沙姆188(C)、依托泊苷(D)的处方用量为考察因素,包封率为指标设计正交试验,筛选最优处方。考察纳米粒的粒径、表面电位、包封率、体外释放情况等。结果:A、B、C、D分别为0.020、0.010、0.015、0.015mg;所制纳米粒平均粒径(83±0.5)nm,表面电位(-23±0.3)mV,包封率81.2%,可持续48h缓释。结论:所制ET-SLN符合药剂学性质要求。     

新藤黄酸固体脂质纳米粒的制备与质量评价

目的制备新藤黄酸固体脂质纳米粒并进行质量考察。方法采用正交试验设计优化处方,以高温乳化-低温固化的方法制备新藤黄酸固体脂质纳米粒。并对其包封率、形态等进行研究。结果所制得的新藤黄酸固体脂质纳米粒外观形态圆整,粒度分布均匀,平均粒径为163.3 nm,包封率为(60.1±1.1)%。结论高温乳化-低温固化的方法适用于新藤黄酸-固体脂质纳米粒的制备。     

雷公藤内酯醇固体脂质纳米粒的制备及理化性质

目的：以聚乙二醇单硬脂酸酯表面修饰材料结合到固体脂质纳米粒（solid lipid nanoparticles,SLN）,以雷公藤内酯醇（triptolide,TPL）为模型药,制备一种具有良好亲水亲脂性的雷公藤内酯醇固体脂质纳米粒。方法：采用熔融-乳化法制备固体脂质纳米粒。通过单因素考察、中心复合设计（central composite design,CCD）,考察脂质材料、聚山梨醇酯-80和PEG-stearate（PEG-SA）三个因素对TPL-SLN粒径、包封率和载药量的影响。通过透射电镜、热分析和X-射线衍射考察TPL-SLN的理化性质,并考察其固体脂质纳米粒的稳定性以及体外释放情况。用MTT法测定其对人正常肝L02细胞和肝癌细胞HepG2的增殖抑制作用并计算其IC₅₀。结果：最优的处方：脂质材料为7.5%,聚山梨醇酯80（Tween 80）为2%和PEG-SA为2%,其粒径（193.43±6.07）nm,包封率（87.63±0.09）%,载药量（0.33±0.01）%。透射电镜观察所制备的纳米粒的形态近似于球形,DSC分析和X-射线衍射证实TPL以非晶型的形式存在于固体脂质纳米粒中。稳定性考察发现纳米粒粒径在一个月的贮存期基本没有变化（P>0.05）,体外释放表明TPL-SLN具有体外缓释特性。TPL-SLN对肿瘤细胞的抑制作用强于正常肝细胞。结论：雷公藤内酯醇聚乙二醇修饰固体脂质纳米粒有望开发为临床口服用药新剂型。     

盐酸氟桂利嗪固体脂质纳米粒包封率的测定

目的建立盐酸氟桂利嗪固体脂质纳米粒包封率的测定方法。方法分别采用透析法、离心法和葡聚糖凝胶法分离盐酸氟桂利嗪固体脂质纳米粒和游离药物,并计算盐酸氟桂利嗪固体脂质纳米粒的包封率。结果透析法包封率的测定结果为76．42％,RSD值为1．75％;离心法包封率为46．37％,RSD值为3．26％;葡聚糖凝胶法包封率为79．2％,RSD值为1．61％。结论通过比较三种方法的优缺点,葡聚糖凝胶法作为盐酸氟桂利嗪固体脂质纳米粒的包封率测定方法最为合适。     

Development of topotecan loaded lipid nanoparticles for chemical stabilization and prolonged release

Topotecan is an important cytotoxic drug that has gained broad acceptance in clinical use for the treatment of refractory ovarian and small-cell lung cancer. The lactone active form of topotecan can be hydrolyzed in vivo, decreasing the drug’s therapeutic efficacy. Lipid encapsulation may promote in vivo stabilization by removing topotecan from aqueous media. Earlier reports of topotecan lipid nanoencapsulation have focused on liposomal encapsulation; however, the higher stability and cost-effectiveness of solid lipid nanoparticles (SLN) highlight the potential of these nanoparticles as an advantageous carrier for topotecan. The initial motivation for this work was to develop, for the first time, solid lipid nanoparticles and nanostructured lipid carriers (NLC) with a high drug loading for topotecan. A microemulsion technique was employed to prepare SLNs and NLCs and produced homogeneous, small size, negatively charged lipid nanoparticles with high entrapment efficiency and satisfactory drug loading. However, low recovery of topotecan was observed when the microemulsion temperature was high and in order to obtain high quality nanoparticles, and precise control of the microemulsion temperature is critical. Nanoencapsulation sustained topotecan release and improved its chemical stability and cytotoxicity. Surprisingly, there were no significant differences between the NLCs and SLNs, and both are potential carriers for topotecan delivery.     

Solid Lipid Nanoparticles of a Water Soluble Drug,Ciprofloxacin Hydrochloride

The aim of this study was to understand and investigate the relationship between experimental factors and their responses in the preparation of ciprofloxacin hydrochloride based solid lipid nanoparticles. A quadratic relationship was studied by developing central composite rotatable design. Amount of lipid and drug, stirring speed and stirring time were selected as experimental factors while particle size, zeta potential and drug entrapment were used as responses. Prior to the experimental design, a qualitative prescreening study was performed to check the effect of various solid lipids and their combinations. Results showed that changing the amount of lipid, stirring speed and stirring time had a noticeable influence on the entrapment efficiencies and particle size of the prepared solid lipid nanoparticles. The particle size of a solid lipid nanoparticle was in the range of 159-246 nm and drug encapsulation efficiencies were marginally improved by choosing a binary mixture of physically incompatible solid lipids. Release of ciprofloxacin hydrochloride from solid lipid nanoparticle was considerably slow, and it shows Higuchi matrix model as the best fitted model. Study of solid lipid nanoparticle suggested that the lipid based carrier system could potentially be exploited as a delivery system with improved drug entrapment efficiency and controlled drug release for water soluble actives.