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Electrospray of multifunctional microparticles for image-guided drug delivery

机译:多功能微粒的电喷雾,用于图像引导药物

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Anti-VEGF therapies have been widely explored for the management of posterior ocular disease, like neovascular age-related macular degeneration (AMD). Loading anti-VEGF therapies in biodegradable microparticles may enable sustained drug release and improved therapeutic outcome. However, existing microfabrication processes such as double emulsification produce drug-loaded microparticles with low encapsulation rate and poor antibody bioactivity. To overcome these limitations, we fabricate multifunctional microparticles by both single needle and coaxial needle electrospray. The experimental setup for the process includes flat-end syringe needles (both single needle and coaxial needle), high voltage power supplies, and syringe pumps. Microparticles are formed by an electrical field between the needles and the ground electrode. Droplet size and morphology are controlled by multiple process parameters and material properties, such as flow rate and applied voltage. The droplets are collected and freezing dried to obtain multifunctional microparticles. Fluorescent beads encapsulated poly(DL-lactide-co-glycolide) acid (PLGA) microparticles are injected into rabbits eyes through intravitreal injection to test the biodegradable time of microparticles.
机译:对于后眼部疾病的治疗,如新生血管性年龄相关性黄斑变性(AMD),抗VEGF治疗已被广泛探索。在可生物降解的微粒中加入抗VEGF治疗可以使药物持续释放并改善治疗效果。但是,现有的微细加工工艺(如双重乳化)会产生载药率低,包封率低和抗体生物活性差的微粒。为了克服这些局限性,我们通过单针和同轴针电喷涂制备了多功能微粒。该过程的实验设置包括平端注射针(单针和同轴针),高压电源和注射泵。微粒是由针和接地电极之间的电场形成的。液滴的大小和形态受多个工艺参数和材料特性(例如流速和施加电压)的控制。收集液滴并冷冻干燥以获得多功能微粒。通过玻璃体内注射将荧光珠包裹的聚(DL-丙交酯-乙交酯-乙交酯)酸(PLGA)微粒注入兔眼,以测试微粒的生物降解时间。

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