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首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >Poly(N-vinylcaprolactam-co-methacrylic acid) hydrogel microparticles for oral insulin delivery
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Poly(N-vinylcaprolactam-co-methacrylic acid) hydrogel microparticles for oral insulin delivery

机译:用于口服胰岛素递送的聚(N-乙烯基己内酰胺-甲基丙烯酸丙烯酸)水凝胶微粒

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摘要

pH-sensitive copolymeric hydrogels prepared from N-vinylcaprolactam and methacrylic acid monomers by free radical polymerization offered 52% encapsulation efficiency and evaluated for oral delivery of human insulin. The in vitro experiments performed on insulin-loaded microparticles in pH 1.2 media (stomach condition) demonstrated no release of insulin in the first 2 h, but almost 100% insulin was released in pH 7.4 media (intestinal condition) in 6 h. The carrier was characterized by Fourier transform infrared, differential scanning calorimeter, thermogravimetry and nuclear magnetic resonance techniques to confirm the formation of copolymer, while scanning electron microscopy was used to assess the morphology of hydrogel microparticles. The in vivo experiments on alloxan-induced diabetic rats showed the biological inhibition up to 50% and glucose tolerance tests exhibited 44% inhibition. The formulations of this study are the promising carriers for oral delivery of insulin.
机译:由N-乙烯基己内酰胺和甲基丙烯酸单体通过自由基聚合制备的pH敏感共聚水凝胶提供52%的包封效率,并评估了人胰岛素的口服递送。在pH 1.2介质(胃条件)中对载有胰岛素的微粒进行的体外实验表明,在最初的2小时内没有释放胰岛素,但在pH 7.4介质(肠条件)中在6 h中几乎释放了100%的胰岛素。通过傅里叶变换红外,差示扫描量热仪,热重分析和核磁共振技术对载体进行了表征,以确认共聚物的形成,同时使用扫描电子显微镜评估了水凝胶微粒的形态。对四氧嘧啶诱导的糖尿病大鼠进行的体内实验显示,其生物抑制作用高达50%,而葡萄糖耐量试验则表现出44%的抑制作用。这项研究的配方是口服胰岛素的有希望的载体。

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