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。     

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。     

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。     

吡喹酮固体脂质纳米粒的制备及其理化性质研究

目的:制备吡喹酮固体脂质纳米粒(PZQ-SLN),并考察其理化性质。方法:以山嵛酸甘油酯和乙酸丁酯为脂质材料,超声分散法制备PZQ-SLN,透射电镜观察纳米粒形态,测定其粒径、Zeta电位和药物包封率,并进行体外释放试验及考察样品的稳定性。结果:所得脂质纳米粒为类圆球状,粒径分布较均匀。样品粒径为(100±21)nm,包封率为(79.3±0.69)%,平均Zeta电位值为—66.3mV。药物体外释放符合Weibull方程。4℃放置3mo后粒径、包封率和Zeta电位均无明显变化。结论:制备的PZQ-SLN理化性质较为理想,能使药物缓慢释放。4℃条件下贮存比较稳定。     

卡马西平硬脂酸固体脂质纳米粒的制备与理化性质研究

用乳化 -溶剂挥发法制得卡马西平硬脂酸纳米粒 ,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。得到的硬脂酸纳米粒平均粒径 (D50 ) 12 0 .0± 9.8nm,Zeta电位为 - 5 0 .6± 3.3m V,包封率 89.8% ,药物体外释放符合 Higuchi线性方程 ,具有明显缓释作用     

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。     

辛伐他汀固体脂质纳米粒的制备及在大鼠体内的药动学研究

摘 要 目的： 制备辛伐他汀固体脂质纳米粒,并研究其经灌胃给药后在大鼠体内的药动学特征。方法: 采用热熔乳化超声 低温固化法制备辛伐他汀固体脂质纳米粒,考察辛伐他汀固体脂质纳米粒的粒径分布、Zeta电位、包封率、微观形态及体外药物释放特性。研究辛伐他汀固体脂质纳米粒经灌胃给药后在大鼠体内的药动学特征。结果: 辛伐他汀固体脂质纳米粒平均粒径为(242.5±62.1) nm,多聚分散系数为0.225±0.031,Zeta电位为(-32.1±4.2) mV,包封率为(95.7±2.6) %,在24 h内平稳缓慢释药。辛伐他汀固体脂质纳米粒在大鼠体内的Cmax和AUC0 t分别为辛伐他汀混悬液的2.89倍和1.83倍。结论:辛伐他汀固体脂质纳米粒在大鼠体内能快速吸收,显著提高了药物在大鼠体内的生物利用度。     

正交设计优化伊曲康唑固体脂质纳米粒的处方组成与制备工艺

目的:制备伊曲康唑固体脂质纳米粒(itraconazole solid lipid nanoparticles,ITZ-SLNs)并对其进行物相分析以确定纳米粒的形成。方法:以伊曲康唑(ITZ)为模型药物,硬脂酸为载体材料,采用乳化-低温固化法制备伊曲康唑固体脂质纳米粒(ITZ-SLN),正交试验设计优化处方组成和制备工艺,并对纳米粒的结构形态、粒径、表面电位、包封率、体外释药特性等进行了研究。结果:以优化处方制备的伊曲康唑固体脂质纳米粒为类球形实体,粒径分布比较均匀,平均粒径为dav=(118.2±15.00)nm,Zeta电位为-(37.06±0.53)mV,包封率为(92.11±1.60)%,药物体外释放符合Higuchi方程,经DSC分析证明纳米粒确已形成。结论:伊曲康唑固体脂质纳米粒有望成为新型缓释纳米给药系统。     

盐酸表柔比星固体脂质纳米粒的制备及其理化性质考察

目的:制备盐酸表柔比星固体脂质纳米粒。方法:以山嵛酸甘油酯为脂质材料,采用超声分散法制备盐酸表柔比星固体脂质纳米粒,并对其形态、粒径、ζ电位、包封率等进行评价,考察制剂4℃下密封放置3个月的稳定性。结果:所制纳米粒外观呈类球形,粒径为(212.8±6.2)nm,ζ电位为(—24.7±0.3)mV,包封率约为82%。4℃放置3个月,制剂的平均粒径、ζ电位、包封率变化不明显。结论:所制盐酸表柔比星固体脂质纳米粒达到设计要求。     

芹菜素固体脂质纳米粒的制备

目的为芹菜素新型制剂的研究和开发提供实验基础。方法采用热熔超声法制备芹菜素固体脂质纳米粒;以包封率为指标,通过正交试验对处方进行优化。结果制备的纳米粒为类球形,包封率为63.11%,平均粒径为(135±18)nm,zeta电位为-18.90 mV,36 h体外累积释放95.74%。结论热熔超声法可用于制备芹菜素固体脂质纳米粒。     

Effect of lipid on physicochemical properties of solid lipid nanoparticle of paclitaxel

The aim of this study was to compare physicochemical properties of solid lipid nanoparticles (SLN) made from different lipids. To make small, stable, uniform and highly encapsulated SLNs, many factors such as the components (lipid, stabilizer) and preparation condition (sonication time, power) can be considered. Out of those, we selected solid lipid as lipid matrix to investigate an effect on SLNs. The SLNs were characterized by particle size, zeta potential, solubility and in vitro release study. In this study, SLNs showed different physicochemical properties and release profiles according to used solid lipid. In case of particle size, M-SLN showed biggest particle size (412.5?±?29.4?nm) and highest encapsulation efficiency (61.2?±?4.8?%). And, B-SLN showed highest cumulative drug percentage (85.0?±?1.7?%, 24?h) in release study. These results suggest that lipids type affect physicochemical properties and release profile of SLN.     

Formulation and in vitro characterization of domperidone loaded solid lipid nanoparticles and nanostructured lipid carriers

Background and the purpose of the study

Domperidone (DOM) is a dopamine- receptor (D₂) antagonist, widely used in the treatment of motion-sickness. The pharmacokinetic parameters of DOM make it a suitable candidate for development of Solid Lipid Nanoparticle (SLN) and Nanostructured Lipide Carrier (NLC). The purpose of the present investigation was to prepare and evaluate DOM loaded solid lipid nanoparticles (DOM-SLN) and DOM loaded nanostructured lipid carriers (DOM-NLC).

Methods

DOM loaded SLN and NLC were prepared by hot homogenization followed by ultrasonication technique, using trimyristin as solid lipid, cetyl recinoleate as liquid lipid and a mixture of soy phosphatidylcholine (99%) and tween 80 as surfactant. SLN and NLC were characterized for particle size, polydispersity index (PDI), zeta potential and entrapment efficiency. The effects of composition of lipid materials and surfactant mixture on the particle size, PDI, zeta potential, drug entrapment efficiency, and in vitro drug release behavior were investigated. DSC analysis was performed to characterize the state of drug and lipid modification. Shape and surface morphology were determined by transmission electron microscopy (TEM). SLN and NLC formulations were subjected to stability study over a period of 40 days.

Results

The mean particle size, PDI, zeta potential and entrapment efficiency of optimized SLN (SLN1) and NLC were found to be 30.45 nm, 0.156, 12.40 mV, 87.84% and 32.23 nm, 0.160, 10.47 mV, 90.49% respectively. DSC studies revealed that DOM was in an amorphous state and triglycerides were in the β prime form in SLN and NLC. Shape and surface morphology was determined by TEM revealed fairly spherical shape of nanoparticles. In vitro release studies demonstrated that both the SLN and NLC formulations possessed a controlled release over a period of 24 hrs. SLN and NLC formulations were subjected to stability over a period of 40 days. There was no significant (P<0.05) change in particle size, zeta potential, PDI and entrapment efficiency indicating the developed SLN and NLC were fairly stable.

Conclusion

Fairly spherical shaped, stable and controlled release DOM-SLN and DOM-NLC could be prepared by hot homogenization followed by ultrasonication technique.     

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。     

醋酸曲安奈德固体脂质纳米粒卡波姆凝胶的性能及经皮给药研究

目的　以醋酸曲安奈德 (TAA)为模型药物 ,以三棕榈酸甘油酯为脂质材料制备醋酸曲安奈德固体脂质纳米粒(SLN)卡波姆凝胶 ,考察其特性以及药物经皮渗透性能。方法　采用高压乳匀技术制得TAA SLN分散液 ,并制成卡波姆凝胶 ,考察了卡波姆凝胶中SLN的微观形态、粒径、Zeta电位、包封率等理化特性和稳定性、体外药物释放行为。采用改进的Franz扩散池研究了SLN卡波姆凝胶的药物经皮渗透性能。结果　制得的TAA SLN为均匀的球形粒子 ,不同载药量SLN粒径为 95 . 5～ 186 . 2nm ,Zeta电位为 - 2 6 .3～ - 15 . 7mV ,包封率为 6 7. 4 3%～ 90 . 3% ;SLN卡波姆凝胶 37℃储存三个月后SLN粒径略有增大 ,Zeta电位无明显变化 ;SLN卡波姆凝胶体外药物释放符合Higuchi方程 (DR % =6 . 3979t1/2 3. 15 2 9,r2 =0 . 95 18) ;经皮渗透实验结果表明 ,与相同药物浓度的普通卡波姆凝胶比较 ,SLN卡波姆凝胶药物经皮渗透速率和药物 2 4h累积渗透量显著提高。结论　TAA SLN卡波姆凝胶稳定性好 ,对药物释放具有缓控释作用 ,能显著促进药物经皮渗透 ,有望成为新型经皮给药制剂。     

In vivo and cytotoxicity evaluation of repaglinide-loaded binary solid lipid nanoparticles after oral administration to rats

The purpose of this work was to develop prolonged release binary lipid matrix-based solid lipid nanoparticles (SLN) of repaglinide (RG) for oral intestinal delivery and to improve the bioavailability of RG. SLN were designed by using glycerol monostearate and tristearin as lipid core materials and Pluronic-F68 as stabilizer. SLN were characterised by their particle size, zeta potential, entrapment efficiency, solid-state studies, in vitro drug release, particle surface and storage stability at 30 °C/65% relative humidity for 3 months. Pharmacodynamic (PD) and pharmacokinetic (PK) studies were also performed in diabetes-induced rat. Moreover, an in vitro toxicity study was performed in rat macrophage cells to establish the safety of the prepared SLN. It was observed that binary lipid matrix-based SLN had better drug entrapment, desired release characteristics, spherical shape and maximum storage stability. Pharmacodynamic study indicated that RG delivered through binary SLN significantly reduces blood glucose, blood cholesterol and blood triglycerides level. The area under the curves after oral administration of optimised RG-SLN formulation and RG control were 113.36 ± 3.01 and 08.08 ± 1.98 h/(ng · mL), respectively. The relative bioavailability of RG was enhanced with optimised SLN formulation when compared with RG control. There was a direct correlation found between the plasma drug level (drug concentration) and the peak response (% blood glucose inhibition) in optimised RG-SLN batch. The in vitro toxicity study indicated that the SLN were well tolerated.     

不同粒径多西他赛固体脂质纳米粒制剂及其细胞毒活性

目的制备不同粒径的多西他赛(docetaxel,DTX)固体脂质纳米粒,考察多西他赛固体脂质纳米粒理化性质,研究粒径对体外释放行为以及细胞毒作用的影响。方法通过热熔超声法制备不同粒径多西他赛固体脂质纳米粒,观察纳米粒形态,测定其包封率、粒径、Zeta电位。考察粒径因素对固体脂质纳米粒体外释放行为、体外细胞毒性的影响。结果制备的纳米粒均为球形及类球形,3种粒径的多西他赛固体脂质纳米粒平均粒径分别为(83.7±8.4)、(162.7±11.9)、(232.1±26.4)nm;Zeta电位分别为-24.19、-23.67、-23.19 mV;包封率分别为98.03%、97.84%、97.92%。60 h粒径分别为83、16、232 nm的多西他赛固体脂质纳米粒在释放介质中分别累计释放86.34%、76.98%、67.14%。3种不同粒径多西他赛固体脂质纳米粒(DTX-SLN-83,DTX-SLN-162,DTX-SLN-232),多西他赛原料药(DTX solutions)以及空白SLN溶液与多西他赛的混合溶液(physi-calm ixture)对MCF-7细胞作用24 h的IC50值分别为3.36、6.20、9.74、13.15、12.92 mg.L-1;48 h的IC50值分别为0.93、2.01、4.35、9.48、9.21 mg.L-1;72 h的IC50值分别为0.30、0.91、1.67、7.36、7.82 mg.L-1。随着多西他赛固体脂质纳米粒粒径的减小,其肿瘤细胞杀伤力逐渐增强。结论热熔超声法可用于制备不同粒径多西他赛固体脂质纳米粒。降低固体脂质纳米粒粒径有利于药物更完全地释放,同时增强其对肿瘤细胞的杀伤能力。     

Studies on binary lipid matrix based solid lipid nanoparticles of repaglinide: in vitro and in vivo evaluation

The purpose of present study is to examine effect of binary lipid matrix (combination of lipids) on the entrapment and storage stability of repaglinide (RG) loaded solid lipid nanoparticles (SLN). Solid lipid nanoparticles were prepared by modified solvent injection method for oral delivery to improve the bioavailability of RG, an antidiabetic drug. The stearic acid and tristearin were used to form lipid core materials, and Pluronic-F68 was used as a stabilizer. Nanoparticles were characterized by evaluating their particle size, zeta potential, entrapment efficiency, drug loading, solid-state studies (differential scanning calorimetry, X-ray diffraction), in vitro drug release, particle surface (transmission electron microscopy analysis with electron diffraction pattern), stability study in gastrointestinal fluids (GIFs) and storage stability at 30 °C/65% RH for 3 months. The characterization of SLN suggested that binary lipid matrix based nanoparticles had better drug entrapment and loading, desired release characteristics, stable in GIFs and significantly higher storage stability compared with single lipid formulations. Pharmacodynamic (blood glucose, blood cholesterol, blood triglyceride levels) and pharmacokinetic (AUC, T(max), peak plasma concentrations, K, t(1/2), mean residence time and relative bioavailabilities) studies were performed for the selected formulations. These studies indicate that the formulation based on binary lipid matrix significantly improves the oral bioavailability of RG.     

Development and evaluation of nitrendipine loaded solid lipid nanoparticles: influence of wax and glyceride lipids on plasma pharmacokinetics

Nitrendipine is an antihypertensive drug with poor oral bioavailability ranging from 10 to 20% due to the first pass metabolism. For improving the oral bioavailability of nitrendipine, nitrendipine loaded solid lipid nanoparticles have been developed using triglyceride (tripalmitin), monoglyceride (glyceryl monostearate) and wax (cetyl palmitate). Poloxamer 188 was used as surfactant. Hot homogenization of melted lipids and aqueous phase followed by ultrasonication at temperature above the melting point of lipid was used to prepare SLN dispersions. SLN were characterized for particle size, zeta potential, entrapment efficiency and crystallinity of lipid and drug. In vitro release studies were performed in phosphate buffer of pH 6.8 using Franz diffusion cell. Pharmacokinetics of nitrendipine loaded solid lipid nanoparticles after intraduodenal administration to conscious male Wistar rats was studied. Bioavailability of nitrendipine was increased three- to four-fold after intraduodenal administration compared to that of nitrendipine suspension. The obtained results are indicative of solid lipid nanoparticles as carriers for improving the bioavailability of lipophilic drugs such as nitrendipine by minimizing first pass metabolism.