以新型银胶为衬底小鼠血清的表面增强拉曼光谱分析

Surface Enhanced Raman Spectrum of Rat Serum in the Novel Silver Colloid

针对以新型银胶体粒子为表面增强拉曼衬底获得的高信噪比的小鼠血清的表面增强拉曼光谱进行了分析,对小鼠血清拉曼光谱进行了初步指认。文章首先根据银胶体粒子形貌及特性,从电磁场物理增强的角度,分析了表面增强拉曼散射中有关银胶体粒子聚集形成"热点"导致局部电场增强效应的作用机理,并依据"热点"理论的分析,认为这种新型银胶体粒子具有很强的局域电场增强效果。同时运用表面增强拉曼中"热点"的现象,解释了小鼠血清的表面增强拉曼光谱中出现的低含量成分的拉曼光谱现象。希望通过表面增强拉曼光谱,了解血清中某些低含量成分的微小变化,进而能够及时获得机体的状况。研究结果为如何获得高信噪比生物大分子的表面增强拉曼散射光谱,了解丰富的生物分子结构信息提供了一种新的方法,同时也为开拓医学上利用血清进行疾病的早期检测提供了一种分子光谱学手段。

In the present article, the high signal-to-noise ratio surface enhanced Raman spectrum of rat serum was analyzed. To he high efficient substrate of SERS, the novel silver colloid was synthesized by microwave method. The characteristic peaks of the rat Raman spectrum were assigned. The mechanism of ＂hot spot＂ which was formed by aggregated silver particles was explained by electromagnetic fields enhancements theory, i.e. the excitation of plasmons in the metallic nanoparticles created greatly enhanced local electromagnetic fields, contributing to the major component of the SERS effect. The field distribution at novel silver aggregates exhibits a dramatic enhancement. These strongly localized fields provide an important mechanism for surface enhanced Raman scattering. The surface enhanced Rarnan spectrum of low quality of component in rat serum was acquired so that the change of body could be known in time. A new method for acquiring abundant information of macro-biomolecule by spectrum means was brought out. It is hopeful to be a novel technique to diagnose diseases in the early stage with serum.