A ‘dual click’ strategy for the fabrication of bioselective, glycosylated self-assembled monolayers as glycocalyx models
作者:Carsten Grabosch、Martin Kind、Yasmin Gies、Felix Schweighöfer、Andreas Terfort、Thisbe K. Lindhorst
DOI:10.1039/c3ob40386f
日期:——
Solid surfaces decorated with specific saccharide patterns can serve as a model for the chemically and structurally highly complex glycocalyx of eukaryotic cells. Here we present an approach based on self-assembled monolayers on gold, which are built up in a three-step manner to provide a solid basis, a biorepulsive oligoethylene glycol part, and a specific carbohydrate terminus in a modular way. Of the different reaction sequences, the one with two consecutive âclick reactionsâ (the copper(I)-catalysed 1,3-dipolar cycloaddition of alkynes with azides and the thiourea-bridging of isothiocyanates with amines) directly âon SAMâ results in the densest layers, as demonstrated by infrared absorption reflection spectroscopy and ellipsometry. As a âreal lifeâ test, the surfaces obtained this way were used for bacterial adhesion experiments. Here the biorepulsivity of the middle part of the SAMs as well as specific binding to the carbohydrate termini could be clearly demonstrated.
用特定糖图案装饰的固体表面可以作为化学和结构高度复杂的真核细胞糖萼的模型。在这里,我们提出了一种基于金上自组装单层的方法,该方法以三步方式构建,以模块化方式提供坚实的基础、生物排斥性的低聚乙二醇部分和特定的碳水化合物末端。在不同的反应序列中,具有两个连续“点击反应”(铜 (I) 催化的炔烃与叠氮化物的 1,3-偶极环加成反应以及异硫氰酸酯与胺的硫脲桥联反应)的反应序列直接正如红外吸收反射光谱和椭圆光度法所证明的那样,SAM™ 上的结果是最致密的层。作为“现实生活”测试,通过这种方式获得的表面用于细菌粘附实验。这里可以清楚地证明 SAM 中部的生物排斥性以及与碳水化合物末端的特异性结合。