作者:Javier Montenegro、Jörg Braun、Ozana Fischer-Onaca、Wolfgang Meier、Stefan Matile
DOI:10.1039/c1ob05835e
日期:——
Transport across the membranes of polymersomes remains difficult in part due to the great thickness of the polymer bilayers. Here, we report that dynamic polyion-counterion transport systems are active in fluorogenic polymersomes composed of poly(dimethylsiloxane)-b-poly(2-methyloxazoline) (PDMS-PMOXA). These results suggest that counterion-activated calf-thymus DNA can act as cation carrier that moves not only across lipid bilayer and bulk chloroform membranes but also across the “plastic” membranes of polymersomes. Compared to egg yolk phosophatidylcholine (EYPC) lipsosomes, activities and activator scope in PDMS-PMOXA polymersomes are clearly reduced. Embedded in agar gel matrices, fluorogenic PDMS-PMOXA polymersomes respond reliably to polyion-counterion transporters, with high contrast, high stability and preserved selectivity. Compared to standard EYPC liposomes, it cannot be said that PDMS-PMOXA polymersomes are better. However, they are different, and this difference could be interesting for the development of sensing devices.
聚合物囊泡膜上的物质运输仍然困难,部分原因在于聚合物双层膜的厚度较大。在这里,我们报告了一种动态的聚离子-反离子运输系统,该系统在由聚二甲基硅氧烷-b-聚2-甲基噁唑啉(PDMS-PMOXA)组成的荧光聚合物囊泡中是活跃的。这些结果表明,反离子激活的小牛胸腺DNA可以作为阳离子载体,不仅能够在脂质双层和大体积氯仿膜之间移动,而且还能穿过聚合物囊泡的"塑料"膜。与蛋黄磷脂酰胆碱(EYPC)脂质体相比,PDMS-PMOXA聚合物囊泡中的活性和激活剂范围明显降低。嵌入琼脂凝胶矩阵中的荧光PDMS-PMOXA聚合物囊泡对聚离子-反离子运输剂的响应可靠,具有高对比度、高稳定性和选择性保持等特点。与标准EYPC脂质体相比,不能说PDMS-PMOXA聚合物囊泡更好。然而,它们的不同之处可能对传感设备的开发有意义。