一种新型基底上右旋肉碱的表面增强拉曼光谱研究

Surface Enhanced Raman Spectroscopy Study of D-Carnitine on a New Base

在聚乙烯吡咯烷酮(PVP)存在下,用多元醇还原硝酸银,Cu(NO_3)_2作为保护剂,快速有效的合成大量银纳米线,并优化了反应条件,得到结构均一、分散性较好的银纳米线。以罗丹明B为探针分子检测了该银纳米基底的表面增强效应,结果表明该基底对罗丹明B的表面增强效果明显,其表面增强因子可达6.4×10~5。文中利用这种基底得到了右旋肉碱的表面增强拉曼光谱(SERS),与其固体常规拉曼光谱(NRS)和10^(-3) mol·L^(-1)水溶液的拉曼光谱对比,并对各自的峰位进行了归属。右旋肉碱固体在3 100~2800和1 700~200cm^(-1)处有明显拉曼振动峰,在右旋肉碱的表面增强拉曼光谱中,1700~200cm^(-1)处的峰得到了明显的增强。经分析,右旋肉碱分子与银纳米基底呈180°。本文还用合成的纳米银基底得到了不同浓度右旋肉碱溶液的表面增强拉曼光谱,其最低检测浓度为10^(-6) mol·L^(-1)。右旋肉碱是一种重要的心血管药物,本文为其研究提供了较全面的拉曼光谱信息,为右旋肉碱的快速、特征、痕量监测提供了有力依据,也为进一步研究右旋肉碱的药理学提供了重要参考。

A fast and efficient way to synthesize a large number of silver nanowires was developed in this paper, in which the re- action conditions were optimized. Under the protection of Cu（NO3 ）2 silver nitrate was reduced by polyol with polyvinyl pyrrolidone （PVP） in existence. The silver nanowires with uniform structure and good dispersion were obtained. Surface enhancement activity of the silver nanowires was detected by using RhB as a probe molecule, its surface enhancement factor can reach 6.4 × 10^5. The results showed that the nanowires significantly enhance the Raman spectroscopy of RhB. The normal Raman spectroscopy （NRS）, Raman spectroscopy of D-carnitine solution and Surface enhanced Raman Spectroscopy of D-carnitine by means of the new base were obtained. There are obvious Raman peaks at 3 100-2 800 and 1 700-200 cm^-1, and the peak of 1 700-200 cm^-1 in the surface enhanced Raman spectra of the D-carnitine can be obviously enhanced. The analysis showed that the angle between the molecular and silver nanoparticles were 180°. The vibrational peaks were assigned comprehensively. Compared with the NRS and SERS of D-carnitine, the detailed structural information of D-carnitine was obtained. In this paper, the surface enhanced Raman spectra of the D-carnitine absorbed on the synthesized silver nanoparticles were obtained, and the minimum detection concentration was 10^-6 mol · L^-1. The new method can be a rapid and characteristic way to detect D-carnitine, and it will also provide an important guidance for the studies on pharmacology of D-carnitine.