The use of nanotechnologies for biomedical applications took a real development during these last years. To allow an effective targeting for biomedical imaging applications, the adsorption of plasmatic proteins on the surface of nanoparticles must be prevented to reduce the hepatic capture and increase the plasmatic time life. In biologic media, metal oxide nanoparticles are not stable and must be coated by biocompatible organic ligands. The use of phosphonate ligands to modify the nanoparticle surface drew a lot of attention in the last years for the design of highly functional hybrid materials. Here, we report a methodology to synthesize bisphosphonates having functionalized PEG side chains with different lengths. The key step is a procedure developed in our laboratory to introduce the bisphosphonate from acyl chloride and tris(trimethylsilyl)phosphite in one step.
纳米技术在生物医学应用领域在过去几年取得了实质性进展。为了实现生物医学成像应用的有效靶向,必须防止血浆蛋白在纳米颗粒表面的吸附,以减少肝脏捕获并延长血浆寿命。在生物介质中,金属氧化物纳米颗粒不稳定,必须被生物相容性有机配体包覆。过去几年,使用膦酸配体修饰纳米颗粒表面引起了很多关注,用于设计高功能的混合材料。在这里,我们报告了一种合成具有不同长度的功能化PEG侧链的双膦酸酯的方法。关键步骤是我们实验室开发的一种程序,可以一步将双膦酸酯从酰氯和三(三甲基硅基)膦酸酯引入。