李武超,闫李丽,陈晓劼,李范珠,朱志红
LI Wu-chao,YAN Li-li,CHEN Xiao-jie,LI Fan-zhu,ZHU Zhi-hong

• 1:国家药品监督管理局食品药品查验中心检查三处
• 2:浙江中医药大学药学院
• 3:广东省药品监督管理局审评认证中心药品注册审评科

摘要(Abstract)：

为制备angiopep-2修饰的载异硫氰酸荧光素(FITC)标记的神经毒素纳米粒(ANG-NPs/FITC-NT),该实验以一定比例m PEG-PLA和ANG-PEG-PLA为载体,以异硫氰酸荧光素标记的神经毒素(FITC-NT)为药物,采用复乳/溶剂挥发法制备纳米粒。以粒径和包封率为综合指标,考察不同超声功率和超声时间组合对工艺的影响;采用透析法研究其在PBS缓冲液(p H7. 4,6. 5)中的体外释药特性。结果表明制备的ANG-NPs/FITC-NT,最佳工艺为超声功率90 W、超声时间30 s;透射电镜下可见纳米粒外形良好,平均粒径(123. 9±0. 5) nm,Zeta电位(-10. 5±0. 5) m V,包封率(68. 1±0. 4)%,载药量(0. 82±0. 01)%;在PBS缓冲液(p H 7. 4,6. 5)中的体外释药行为均符合Ritger-Peppas方程,分别为ln Q=0. 508 8lnt-2. 285 0,r=0. 961 5(p H7. 4)及ln Q=0. 449 9lnt-1. 855 3,r=0. 970 3(p H 6. 5)。实验结果证明复乳/溶剂挥发法制备的纳米粒,包封率较高,粒径均匀,具有体外缓释特性,可能会成为NT脑内递药的良好载体。
In order to prepare angiopep-2 modified fluorescein isothiocyanate-labeled neurotoxin nanoparticles( ANG-NPs/FITCNT),emulsion/solvent evaporation method was used with m PEG-PLA and ANG-PEG-PLA( in proper proportions) as carriers and with FITC-NT as drug. With particle size and encapsulation efficiency as comprehensive indexes,the effects of different ultrasound power and ultrasound time combinations on the process were investigated. The in vitro release characteristics of nanoparticles in PBS buffer at p H 7. 4 and p H 6. 5 were investigated by dialysis method. The results indicated that the optimum process for preparing ANG-NPs/FITC-NT was as follows: ultrasonic power 90 W,ultrasonic time 30 s. In such optimal process,ANG-NPs/FITC-NT were well-shaped under the transmission electron microscope,with an average particle size of( 123. 9±0. 5) nm,Zeta potential of(-10. 5±0. 5) m V,encapsulation efficiency of( 68. 1±0. 4) %,and the drug loading of( 0. 82±0. 01) %. The in vitro drug release profiles of the nanoparticles in PBS buffer at p H 7. 4 and p H 6. 5 were both consistent with Ritger-Peppas equation,ln Q = 0. 508 8 lnt-2. 285 0,r = 0. 961 5( p H 7. 4) and ln Q= 0. 449 9 lnt-1. 855 3,r = 0. 970 3( p H 6. 5),respectively. The experiment results proved that the nanoparticles prepared by emulsion/solvent evaporation method had uniform particle size,high encapsulation efficiency and in vitro sustained release characteristic,which might be a potential carrier for NT intracerebral drug delivery.

关键词(KeyWords)： angiopep-2;FITC;神经毒素;纳米粒;马来酰亚胺基封端聚乙二醇-聚乳酸嵌段共聚物;体外释放
angiopep-2;FITC;neurotoxin;nanoparticles;Mal-PEG-PLA block copolymer;in vitro release

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(81873014,81473361);; 浙江省大学生科技创新活动计划暨新苗人才计划项目(2013R410063)

作者(Author): 李武超,闫李丽,陈晓劼,李范珠,朱志红
LI Wu-chao,YAN Li-li,CHEN Xiao-jie,LI Fan-zhu,ZHU Zhi-hong

DOI: 10.19540/j.cnki.cjcmm.20190630.301

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