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??OBJECTIVE To prepare PLGA magnetic nanoparticles loaded with tetrandrine, heat the nanoparticles by inductive heating system, and study the particle size, morphology and drug release before and after heating. METHODS Co-loaded PLGA NPs were prepared by emulsion solvent diffusion method; the physicochemical and magnetic characteristics of co-loaded PLGA NPs were investigated by DLS, SEM, TEM and VSM; RP-HPLC and ICP-MS analysis were used to measure the tetrandrine and Fe₃O₄ loading and entrapment efficiency. The EASYHEAT system was applied to heat the nanoparticles and further investigate the changes of particle size, morphology and drug release after inductive heating. RESULTS Tetrandrine-loaded PLGA magnetic nanoparticles showed spherical shape with smooth surface and the Fe₃O₄ NPs were homogeneously distributed inside the polymeric nanoparticles; VSM result indicated that the co-loaded PLGA NPs were superparamagnetic; both tetrandrine and Fe₃O₄ showed good loading and entrapment efficiency. After being heated to 45 ??, the diameter of co-loaded PLGA NPs increased; the morphology changed from a spherical shape into a nondefined, irregular shape; arrangement or aggregation of the incorporated Fe₃O₄ NPs were found. In addition, the drug release amount was also increased. CONCLUSION With superparamagnetic property, the tetrandrine loaded-PLGA magnetic nanoparticles can effectively control the drug release behavior by inductive heating.
     

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??OBJECTIVE To prepare calcitonin/puerarin-PLGA-dual-loaded nanoparticles modified by chitosan, and investigate theirin vitro release behavior.METHODS CS-CT/PR-NPs were prepared by the double emulsion solvent evaporation technique with PLGA as a carrier material; the formulation of CS-CT/PR-NPs was optimized by orthogonal design; the morphology of CS-CT/PR-NPs was observed by transmission electron microscope;the mean particle size,particle size distribution and Zeta potential were measured by laser particle size analyzer; the entrapment efficiency and drug loading were measured by ultracentrifugation; the in vitro release behavior was studied by dialysis. RESULTS CS-CT/PR-NPs were spherical in shape with the mean particle size of(190??2.65) nm, particle size distribution of (0.117??0.027) and Zeta potentialof(16.5??1.08) mV. The entrapment efficiency was (75.7??1.15)%, and the drug loading of CT was (3.47??0.31)%, while those of PR were (50.9??1.08)% and (4.68??0.19)%, respectively. The profiles of in vitro release had the features of sustained-release. CONCLUSION CS-CT/PR-NPs are prepared successfully and show a sustained-release characteristic with high entrapment efficiency, which may improve the oral bioavailability of CT and provide the experimental reference for preparing the dual-loaded nanoparticles.     

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??OBJECTIVE To prepare doxorubicin-loased heparinized magnetic mesoporous silica nanoparticles (MMSNs-HP) and investigate their drug release profile and anticancer activity in vitro. METHODS Amino-modified MMSNs was synthesized by combining phase transfer method with sol-gel method firstly. Then heparin was conjugated with the above nanoparticles via carbodiimide chemistry to form MMSNs-HP. Finally, the following experiments were performed, such as loading/release of doxorubicin into/from MMSNs-HP in vitro, cellular uptake of MMSNs-HP by hepatoma cell HepG2 and cell cytotoxicity of doxorubicin-loaded MMSNs-HP. RESULTS MMSNs-HP was able to delay the release of doxorubicin significantly, penetrate into tumor cells, kill HepG2 cell, and inhibit the proliferation of HepG2 cells induced by basic fibroblast HepG2 cells (bFGF). CONCLUSION MMSNs-HP is a potential drug carrier for the delivery of antitumor drugs.     

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??OBJECTIVE To prepare heparan sulfate-vitamin E succinate (HDV) amphipathic copolymers and explore the pharmaceutical properties of doxorubicin (DOX)-loaded HDV copolymer micelles (DOX/HDV). METHODS HDV copolymers were prepared by amide reaction and its structure was confirmed by ¹H-NMR. DOX/HDV micelles were prepared by ultrasonic method. The particle size, morphology, Zeta potential, drug loading, entrapment efficiency, and in vitro drug release and cytotoxicity were evaluated. RESULTS HDV amphipathic copolymers were synthesized successfully. The particle size, PDI value and Zeta potential of drug-loaded micelles were (105.0??7.3) nm, (0.239??0.484) and (-21.4??2.6) mV, respectively. The encapsulation and drug loading rate were (76.22??0.76)% and (9.53?? 0.58)%, respectively. The results of drug release test in vitro showed that DOX was released slowly from the micelles. Cytotoxicity experiments indicated that blank micelles had no apparent toxicity against both tumor cells and normal cells. However, DOX/HDV micelles could inhibit the tumor cells growth obviously. CONCLUSION HDV copolymers can effectively load DOX with properties of drug sustained release and enhanced cytotoxicity against tumor cells in vitro, which indicates that HDV may be a potential candidate for cancer therapy.     

载和厚朴酚介孔二氧化硅包覆聚吡咯纳米粒的制备研究

目的制备载和厚朴酚(HK)介孔二氧化硅(MSN)包覆聚吡咯纳米粒(PPy@MSN-HK),考察其体外释放特性。方法首先制备聚吡咯纳米粒,然后在其表面包裹MSN壳层,再吸附HK,即得PPy@MSN-HK。依次从透射电镜图、粒径、Zeta电位、载药量、包封率、红外光谱分析、体外光热研究及体外释放度等方面进行评价,采用相似因子(f2)法分析释放曲线,并运用多种常用数学模型拟合溶出曲线。结果透射电镜图显示,制备的MSN包覆聚吡咯纳米粒(PPy@MSN)粒径大小均一,分布均匀,平均粒径为(220.4±4.2)nm,多分散系数为0.042±0.010,Zeta电位为(-21.1±0.8)m V,载药量为(2.58±0.53)%,包封率为(75.04±0.95)%。体外光热实验结果表明,在照射激光功率密度不变的情况下,随着纳米粒质量浓度逐渐增大,纳米粒混悬液温度变化值明显增大,说明PPy@MSN具有良好的光热效应。体外释放实验表明,PPy@MSN-HK与HK原料药的释放曲线不相似,分别以Ritger-Peppas、Logistic方程拟合最佳。原料药释放曲线最接近Ritger-Peppas方程(R2=0.997 32);PPy@MSN-HK释放曲线用Logistic方程拟合最好(R~2=0.997 88)。结论采用水溶液法成功制备了PPy@MSN-HK,为肿瘤治疗提供新的给药策略。     

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??OBJECTIVE To prepare aziditaxel-loaded mPEG-PLA polymeric micelles, investigate its pharmaceutical characteristics and study its anti-tumor effects in vitro. METHODS Aziditaxel-loaded polymeric micelles were prepared by thin-film dispersion method. The morphology of aziditaxel-loaded micelles was observed under transmission electron microscope. The particle size distribution and Zeta potential of aziditaxel-loaded micelles were determined by dynamic light scattering method using a Malvern Zetasizer Nano ZS90 analyzer. The technical reproducibility and reconstitution stability of aziditaxel-loaded micelles were also checked. The drug loading and encapsulation efficiency were measured by HPLC. Dialysis method was used to investigate the in vitro release of aziditaxel-loaded micelles, and the release manner was fitted using the mathematic models. The in vitro anti-tumor activities were evaluated by proliferation inhibition and cycle block experiment. RESULTS Aziditaxel-loaded polymeric micelles were prepared successfully. Aziditaxel-loaded polymeric micelles showed spherical shape with a mean particle size of 24.50 nm, polydispersity index of 0.117 and Zeta potential of -10.06 mV. The mean drug loading and entrapment efficiency were (16.00??0.15)% and (95.80??0.10)%, respectively. The preparation reproducibility was fine, and the reconstitution solution of lyophilized preparation of aziditaxel-loaded polymeric micelles maintained stable within 6 h. The release behavior of aziditaxel-loaded micelles conformed to the ambiexponent model. Drug-loaded micelles could obviously inhibit the proliferation of MCF-7 breast cancer cell lines in vitro, and induce significant G₂/M cycle arrest and apoptosis on MCF-7 cancer cells. CONCLUSION Aziditaxel-loaded mPEG-PLA polymeric micelles are successfully prepared. The preparation method is simple, and the pharmaceutical properties of the products conform to the requirements of the subsequent study. The prepared aziditaxel-loaded polymeric micelles exhibit good application prospect with favourable in vitro anti-tumor activities.     

丹参聚多巴胺纳米递药系统的构建及对H_2O_2诱导心肌细胞氧化损伤的保护作用研究

目的利用聚多巴胺(PDA)为载体,构建丹参(SMRR)PDA纳米递药系统(PDA-SMRR),能够大剂量负载多种丹参水溶性成分,使其更好地发挥抗氧化应激作用。方法制备PDA-SMRR纳米粒,通过单因素实验考察并优化处方工艺;通过激光粒度分析仪和透射电子显微镜考察纳米粒的粒径、电位和形态;透析法分析载药量及累积释放率;提取并培养大鼠乳鼠心肌细胞;CCK-8实验考察PDA-SMRR的生物安全性并验证PDA-SMRR对氧化应激损伤的心肌细胞的保护作用。结果最优载药工艺为pH值为3.5,载药时间为12 h,载药温度为室温,并成功制备PDA-SMRR;其形态规整、大小均匀,测得纳米粒粒径为(459.2±4.5)nm,体外释放表明该递药系统释放SMRR较缓慢;CCK-8实验说明PDA-SMRR生物安全性良好且纳米粒可以降低氧化应激造成的心肌细胞损伤。结论 PDA-SMRR可以作为丹参多成分药物储库,载药量高,具有缓释效应,可以有效减少氧化应激对心肌细胞的损伤。     

芹黄素纳米脂质载体制剂的制备及理化性质考察

目的:制备芹黄素纳米脂质载体制剂并进行质量评价。方法:采用高温乳化-低温固化法制备芹黄素纳米脂质载体制剂,并对其形态、粒径、表面电位、包封率、载药量、体外释药等特性进行考察。结果:得到的芹黄素纳米粒为类球形,粒径分布均匀,平均粒径为212.1 nm,Zeta电位为-14.65 mV,平均包封率为82.4%,平均载药量为0.97%,体外2 h累积释药30%,随后释药过程趋于缓慢。结论:所制备的芹黄素纳米脂质载体制剂性质稳定,有良好的应用前景。