Box-Behnken效应面法优化姜黄素纳米结构脂质载体处方

目的采用Box-Behnken效应面法优化处方,制备姜黄素纳米结构脂质载体,并考察其理化性质。方法采用薄膜超声法制备载药纳米结构脂质载体,分别以药物质量浓度(X1)、总脂质质量浓度(X2)和混合乳化剂质量浓度(X3)为考察对象,以包封率(Y1)、粒径(Y2)为评价指标,利用三因素三水平Box-Behnken效应面设计法筛选载药纳米结构脂质载体的最佳处方。采用微柱离心法测定制剂的包封率,透射电镜观察其外观形态,动态光衍射法测定其粒径及Zeta,差示扫描量热法确证姜黄素在载体中的分散状态。结果最优处方制备的载药纳米结构脂质载体外形呈圆形或椭球形,粒径分布均匀,平均粒径为(58.37±2.60)nm,Zeta电位为-(22.6±0.88)mV,包封率为(93.48±0.86)%,DSC结果表明药物以非结晶状分散于纳米结构脂质载体中。结论采用Box-Behnken效应面法优化姜黄素纳米结构脂质载体处方是可行的。     

奥扎格雷纳米结构脂质载体的制备及体外评价

目的:制备奥扎格雷纳米结构脂质载体(ozagrel-loaded nanostructured lipid carriers,OZ-NLC),并考察其理化性质及体外释放。方法:采用熔融-超声乳化法制备OZ-NLC,通过正交设计法优化处方与制备工艺,使用透射电镜(TEM)、激光粒度测定仪、差示扫描量热仪(DSC)及X-射线衍射仪(XRD)考察OZ-NLC的理化性质,通过溶出试验评价其体外释放效果。结果:所制备的OZ-NLC呈球形或类球形;平均粒径为(115±10)nm;Zeta电位为(-37.6±8.9)mV;平均包封率为(61.3±5.2)%;XRD与DSC表明药物以无定形形式分散于OZ-NLC中。与奥扎格雷混悬液相比,OZ-NLC的体外溶出量明显提高且具有很好的缓释效果。结论:熔融-超声乳化法制备的OZ-NLC对促进难溶性药物奥扎格雷的口服吸收具有一定的指导价值。     

枸橼酸西地那非纳米结构脂质载体的制备及体外释放研究

目的 制备枸橼酸西地那非纳米结构脂质载体（SC-NLCs）,考察其理化性质,并评价其体外释放行为。方法 采用薄膜超声分散法制备SC-NLCs,并对制得的SC-NLCs进行理化性质考察;建立HPLC法测定SC-NLCs体外释放中枸橼酸西地那非的含量,利用动态膜透析法对SC-NLCs与枸橼酸西地那非溶液的体外释放性能进行考察。结果 SC-NLCs在水中分散为乳白色且可见乳光的胶体溶液,具有良好的分散特征,透射电镜观察显示SC-NLCs外观较为圆整,分布均匀。平均粒径、包封率、电位、多分散系数分别为66.96 nm、（69.26±0.73）%、（18.00±4.84）mV和0.247。体外释放试验结果显示,枸橼酸西地那非溶液在pH 5.5的磷酸缓冲盐溶液中4 h后累积释放的枸橼酸西地那非达（97.32±3.14）%,而SC-NLCs在4 h累积释放的枸橼酸西地那非约（72.16±2.51）%,在24 h后达到释放平台,累积释放的枸橼酸西地那非约（84.29±2.00）%。结论 制备的SC-NLCs粒径大小均一,分散均匀;在体外释放行为方面,亦具有良好的缓释特性。     

Box-Behnken设计-效应面法优化根皮素纳米结构脂质载体处方研究

目的： Box-Behnken设计-效应面法优化根皮素纳米结构脂质载体处方。方法： 乳化超声法制备根皮素纳米结构脂质载体,采用包封率（Y₁）和粒径（Y₂）作为考察指标,选择脂-药比（X₁）、固液脂质比（X₂）、表面活性剂浓度（X₃）为主要影响因素,通过二次多元回归模型拟合根皮素纳米结构脂质载体的影响因素与响应值之间的关系,绘制模型效应面图,并验证最佳处方。结果： 最佳处方为：脂-药比为16.4,固液脂质比为4.7,表面活性剂浓度为1.3%。所得3批根皮素纳米结构脂质载体包封率分别为85.7%、84.9%和85.1%;粒径分别为166.9 nm、168.4 nm和170.3 nm,与模型预测值接近。制备的根皮素纳米结构脂质载体基本外貌为圆形,无粘连现象。根皮素存在状态由结晶态转变为无定型态。体外释药具有明显的缓释特征,释药过程符合Weibull模型。结论： Box-Behnken实验设计可用于根皮素纳米结构脂质载体处方的筛选,为后续体内外研究奠定了基础。     

Box-Behnken效应面法优化石杉碱甲纳米结构脂质载体处方

目的采用Box-Behnken效应面法筛选石杉碱甲纳米结构脂质载体最佳处方。方法采用熔融超声-高压匀质法制备石杉碱甲纳米结构脂质载体,分别以混合脂质(X1)、混合乳化剂(X2)和脂药比(X3)为考察对象,以粒径(Y1)、包封率(Y2)和载药量(Y3)为评价指标,利用三因素三水平Box-Behnken效应面设计法筛选石杉碱甲纳米结构脂质载体的最佳处方。结果按最优处方制备的纳米粒粒径为(121.67±3.21)nm、包封率为(89.18±0.28)%、载药量为(1.46±0.05)%,与预测值偏差均小于5%。结论采用Box-Behnken效应面法优化石杉碱甲纳米结构脂质载体处方是有效、可行的。     

长春西汀纳米结构脂质载体的体外释放研究

目的：制备长春西汀纳米结构脂质载体,考察其体外释放规律。方法：选择pH7.4的磷酸盐缓冲液（PBS）作为释放介质,采用透析法测定长春西汀纳米结构脂质载体的体外释放。结果：长春西汀纳米结构脂质载体在24h释放为44%,药物在体外呈现缓释释放,符合Weibull分布。结论：所制备长春西汀纳米结构脂质载体体外缓释效果良好。     

盐霉素纳米结构脂质载体的制备及处方优化

目的:制备盐霉素纳米结构脂质载体(Sal-NLCs)并优化处方。方法:采用熔融乳化-低温固化法制备Sal-NLCs。采用星点设计-响应面法,以粒径、Zeta电位、包封率、载药量为评价指标,优化处方中Sal用量、油相中固态脂质双硬脂酸甘油酯与液态脂质辛癸酸甘油酯的质量比、表面活性剂聚氧乙烯35蓖麻油(EL)与聚乙二醇-15-羟基硬脂酸酯(HS15)的质量比及聚氧乙烯(40)硬脂酸酯(P40)的用量。考察所制Sal-NLCs的外观形态、粒径、多分散指数(PDI)、Zeta电位、包封率、载药量和体外释药机制。结果:最优处方为Sal 0.86 mg、双硬脂酸甘油酯40.70 mg、辛癸酸甘油酯11.30 mg、EL 44.05 mg,HS15 7.95 mg、P40 3.8 mg;所制Sal-NLCs呈类圆形、分布均匀,粒径为(81.81±2.60)nm、PDI为0.183±0.042、Zeta电位为(-24.9±3.4)m V、包封率为(94.35±1.50)%、载药量为(1.47±0.04)%(n=5),24 h内累积释放度达到(99.81±3.90)%(n=3),释放行为符合Higuchi模型,其中粒径、Zeta电位、包封率、载药量与模型预测值的相对误差均小于4%。结论:按优化处方成功制得具有缓释效果的Sal-NLCs,且质量达到预期标准。     

新型纳米给药系统-纳米结构脂质载体的研究进展

目的综述近几年纳米结构脂质载体的研究进展。方法检索近年来国内外有关纳米结构脂质载体的研究性文献,并进行分析、归纳。结果与传统载体系统和固体脂质纳米粒相比,纳米结构脂质载体具有更高的载药能力、稳定性以及缓释作用。结论纳米结构脂质载体具有广阔的发展前景。     

纳米结构脂质载体的制备及性质研究进展

纳米结构脂质载体(nanostructured lipid carrier,NLC)是在固体脂质纳米粒基础上发展的脂质纳米粒,它由固体脂质和液态脂质混合制备而得。综述了NLC的制备方法、粒径形态、载药能力、晶型结构、稳定性及应用的研究进展。     

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.     

聚乙二醇修饰青蒿素脂质纳米粒冻干工艺优化及其表征

目的筛选聚乙二醇(PEG)修饰青蒿素脂质纳米粒(PEG-ART-NLC)最优冻干保护剂处方,研究其冷冻干燥工艺及质量表征。方法制备含不同冻干保护剂的PEG-ART-NLC冻干粉,以外观、再分散性、复溶后外观、粒径、Zeta电位为指标,优化保护剂处方,并对比冻干前后脂质纳米粒质量变化。结果 4%甘露醇和4%蔗糖具良好的保护作用和再分散性,冻干后纳米粒粒径增大14.0 nm,Zeta电位绝对值降低8.8 m V,包封率降低14.5%,电镜下冻干前后纳米粒形态均为圆形或椭圆形,无明显差异。结论 4%甘露醇和4%蔗糖为最优保护剂处方,可用于制备稳定的PEG-ART-NLC冻干粉。     

Ginsenoside improves physicochemical properties and bioavailability of curcumin-loaded nanostructured lipid carrier

The aim of this study was to develop a ginsenoside-modified nanostructured lipid carrier (G-NLC) dispersion containing curcumin. The NLC was prepared by melt emulsification with slight modification process. Different G-NLC dispersion systems were prepared using lipid carrier matrix composed of ginsenoside, phosphatidylcholine, lysophosphatidylcholine, and hydrogenated bean oil. TEM image of the nanoparticles in the NLC dispersion showed core/shell structure, and there was corona-like layer surrounding the particles in the G-NLC. The mean particle size of G-NLC dispersion was in the range of about 300–500 nm and stayed submicron size up to 12 months. The in vitro release of curcumin was faster in pH 1.2 compared to pH 6.8 and it showed linear release pattern after lag time of 1 h. When the G-NLC dispersion was orally administered to rats, C_max of the free curcumin was 15.2 and 32.3 ng/mL at doses of 50 and 100 mg/kg, respectively, while it was below quantification limit when curcumin was administered as of dispersion in distilled water. Based on these results, it is certain that ginsenoside modulated the NLC dispersion, leading to enduring shelf-life of the dispersion system and enhanced bioavailability. These results strongly suggest that ginsenoside holds a promising potential as a pharmaceutical excipient in the pharmaceutical industries to increase the utility of various bioactives.     

氟比洛芬纳米结构脂质载体凝胶剂的物理性质

目的制备氟比洛芬纳米结构脂质载体凝胶剂,并对其物理性质如流变学性质、黏附性和凝胶强度等进行研究。方法分别采用同轴圆筒流变仪和物性分析仪研究氟比洛芬纳米结构脂质载体的流变学性质、黏附性和凝胶强度,并研究了不同贮存温度对上述性质的影响。结果流变学研究结果表明FP-NLC凝胶具有良好的黏弹性,为假塑性流体,高温不利于保持其内部网状结构;物性分析结果表明凝胶剂在低温贮存时能够保持较高的黏附性和凝胶强度。结论氟比洛芬纳米结构脂质载体凝胶剂的流变学性质、黏附性和凝胶强度等物理性质受贮存温度影响较大,将其开发成制剂时需考虑其放置稳定性。     

Preparation of tripterine nanostructured lipid carriers and their absorption in rat intestine

The purpose of this study was to develop an optimized nanostructured lipid carrier formulation (NLC) for tripterine, and to estimate the potential of NLCs as oral delivery system. Tripterine-loaded NLCs were prepared by the solvent evaporation method. The average drug entrapment efficiency, particle size and zeta potential of the optimized tripterine-loaded NLCs were 78.64 +/- 0.37%, 109.6 +/- 5.8 nm and -29.8 +/- 1.3 mV, respectively. The tripterine-loaded NLCs showed spherical morphology with smooth surface under the transmission electron microscope (TEM). The crystallization of drug in NLC was investigated by differential scanning calorimetry (DSC). The drug was in an amorphous state in the NLC matrix. According to the in vitro release study, the tripterine-loaded NLCs showed a delayed release profile of tripterine. The rat intestinal perfusion model was used to study the absorption of tripterine solution and tripterine-loaded NLCs. The Peff* (effective permeability) of tripterine-loaded NLCs in the duodenum, jejunum, ileum and colon was approximately 2.1, 2.7, 1.1, 1.2-fold higher than that of tripterine solution, respectively. The 10% ABS (percent absorption of 10 cm of intestine) of tripterine-loaded NLCs in the duodenum, jejunum, ileum and colon was approximately 2.2, 2.3, 1.2, 1.3-fold higher than that of tripterine solution, respectively. The intestinal toxicity of tripterine formulated in the NLCs was investigated and compared with the tripterine solution by the MTT assay with Caco-2 cell models. According to the result, the tripterine-loaded NLCs could greatly decrease the cytotoxicity of the drug. In conclusion, the NLC formulation remarkably improved the absorption of tripterine and showed a better biocompatibility.     

新型纳米结构脂质载体系统的研究进展

目的介绍新型的纳米结构脂质载体系统的研究进展,为其研究和应用提供参考。方法查阅相关文献33篇,进行整理和归纳。结果新型的纳米结构脂质载体能够克服固体脂质纳米粒的一些不足,并具有独特的结构特征,药物的包封机理和释放特征。结论纳米结构脂质载体作为药物传递系统的一种新剂型,具有广阔的发展前景。     

Development of artemether and lumefantrine co-loaded nanostructured lipid carriers: physicochemical characterization and in vivo antimalarial activity

Context: Artemether and lumefantrine combination therapy is well-accepted for uncomplicated malaria treatment. However, the current available formulation has several pharmacokinetic mismatches such as drug degradation in gastrointestinal tract, erratic absorption, etc. Hence, need of the hour is the injectable formulation, which can overcome the pharmacokinetic mismatch associated with current available formulation in the market.

Objective: To fabricate artemether and lumefantrine co-loaded injectable nanostructured lipid carriers (NLCs) formulation.

Materials and methods: Artemether and lumefantrine co-loaded NLCs were fabricated using homogenization followed by ultra-sonication method. Fabricated NLCs were evalauated for their physicochemical characteristics, and suitability of the formulation for malaria treatment was evaluated using in vivo animal model (Plasmodium berghei-infected mice).

Results, discussion and conclusion: Artemether and lumefantrine co-loaded NLCs had a hydrodynamic diameter of ～145?nm with the surface charge of ?66?mV. Due to the lipophilic nature of both antimalarial drugs, both single drugs-loaded and co-loaded NLCs have shown high encapsulation efficiency, which is 84% for artemether and 79% for lumefantrine. In vitro drug release study has shown a biphasic drug release pattern, which has shown 63% artemether release and 45% of lumefantrine release over a time period of 30?h. Plasmodium berghei-infected mice treated with artemether and lumefantrine co-loaded NLCs showed better antimalarial activity with respect to parasitemia progression and survivability period.