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首页> 外文期刊>Biomaterials >Microphase separation in bioerodible copolymers for drug delivery.
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Microphase separation in bioerodible copolymers for drug delivery.

机译:生物可蚀性共聚物中的微相分离,用于药物输送。

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This research examines the microstructure of bioerodible polyanhydrides with an eye towards precise design of drug delivery devices. Our main hypothesis is that the bioerodible copolymer poly(1,6-bis-p-carboxyphenoxyhexane-co-sebacic anhydride) (CPH : SA) undergoes micro-phase separation at certain copolymer compositions due to differences in relative hydrophobicity of the co-monomers, resulting in thermodynamic partitioning of drugs incorporated into these copolymers. We investigate the thermal properties, degree of crystallinity, and surface microstructure of several compositions of CPH : SA using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and atomic force microscopy (AFM). We observe that the degree of crystallinity decreases, while the crystal lamellar thickness increases with CPH content. Phase-imaging using AFM indicates the presence of micro-domains in 20 : 80 and 80 : 20 CPH : SA, while poly(SA) and 50 : 50 CPH : SA show no micro-phase separation. Finally, drug-polymer interactions are studied by loading the polymers with different amounts of brilliant blue (hydrophilic) and p-nitroaniline (hydrophobic). DSC and WAXD analysis shows that loading hydrophobic drugs into relatively hydrophobic polymers (poly(SA)) lowers melting point that becomes more pronounced with increased drug loading.
机译:这项研究检查了可生物蚀解的酸酐的微观结构,并着眼于精确设计药物输送装置。我们的主要假设是,由于共聚单体的相对疏水性不同,可生物蚀解的共聚物聚(1,6-双-对-羧基苯氧基己烷-共癸二酸酐)(CPH:SA)在某些共聚物组成上经历了微相分离。 ,导致掺入这些共聚物中的药物发生热力学分配。我们使用差示扫描量热法(DSC),广角X射线衍射(WAXD)和原子力显微镜(AFM)研究了CPH:SA的几种成分的热性能,结晶度和表面微观结构。我们观察到结晶度降低,而晶体层厚度随CPH含量的增加而增加。使用AFM的相成像表明在20:80和80:20 CPH:SA中存在微区,而poly(SA)和50:50 CPH:SA则没有微相分离。最后,通过向聚合物中加载不同量的亮蓝色(亲水性)和对硝基苯胺(疏水性)来研究药物与聚合物之间的相互作用。 DSC和WAXD分析表明,将疏水性药物装载到相对疏水的聚合物(poly(SA))中会降低熔点,随着药物装载量的增加,熔点会变得更加明显。

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