Design, synthesis, characterization and biological evaluation of Thieno[2,3−b]pyridines−chitosan nanocomposites as drug delivery systems for colon targeting
作者:Hanaa Mansour、Ahmed I. Khodair、Samia M. Elsiginy、Amal E. Elghanam
DOI:10.1016/j.carres.2020.107990
日期:2020.6
nanocomposites were investigated and showed that the drug release rate is pH-dependent and the trend is as follows: basic > neutral > acidic. The faster release rate in basic medium effectively prolongs drug delivery in gastric pH. Additionally, the antibacterial investigation showed that DATPa-c and CS-DATPa-c nanocomposites exhibited antibacterial activity against both Gram-positive and Gram-negative bacteria
噻吩并[2,3-b]吡啶衍生物DATPa-c是基于Thorpe-Ziegler环化反应合成的。亚芳基丙二腈衍生物(Ia-c)与硫氰基乙酰胺(II)在碱性介质(哌啶)中反应,然后使用氯乙酸乙酯进行烷基化,最后在乙醇钠中环化生成DATPa-c。使用三聚磷酸钠(TPP)从DATPa-c和CS纳米颗粒制备噻吩并[2,3-b]吡啶-壳聚糖纳米复合材料CS-DATPa-c。CS-DATPa-c纳米复合材料使用FTIR,TEM和XRD技术进行了表征,并显示出相对较窄的单分散纳米颗粒尺寸分布,平均尺寸为14-78 nm。对CS-DAΤPa-c纳米复合材料的体外释放研究进行了研究,结果表明药物释放速率是pH依赖性的,其趋势如下:碱性>中性>酸性。在碱性介质中更快的释放速率可有效延长药物在胃pH值下的传递。此外,抗菌研究表明,DATPa-c和CS-DATPa-c纳米复合材料对革兰氏阳性和革兰氏阴性细菌均表现出