葡萄糖溶液的太赫兹光谱观察

Observation of terahertz spectra of glucose solution

生物有机分子的生物功能必须在其水溶液中实现。太赫兹波对水非常敏感,太赫兹时域光谱(THz-TDS)技术能够检测生物分子——水分子界面的集体水分子网络动力学变化,是检测和研究生物有机分子溶液的理想工具。本文利用太赫兹时域光谱技术研究了葡萄糖的分子结构,获得葡萄糖及其不同浓度的溶液在室温氮气环境下的太赫兹时域吸收光谱,以及在室温真空环境下的傅里叶远红外光谱(FTFIR)。结果表明葡萄糖溶液对太赫兹波有特征吸收峰,不同浓度的葡萄糖溶液对太赫兹波的吸收各不相同。故使用太赫兹时域光谱技术能够完成葡萄糖及其不同浓度溶液的鉴别。

Biological functions of biological organic molecules must be achieved in their solutions. Terahertz wave is very sensitive to water and it can detect changes of the water dynamics of biological molecules directly in hydration layer between water and solute molecules. Thus, Terahertz Time Domain Spectroscopy(THz-TDS) technology is an ideal tool for the detection and research of biomolecular organic solutions. In this paper, THz-TDS is used to research the molecular structures of glucose. The absorption spectrum of glucose and its solutions of various concentrations are obtained by THz-TDS and Fourier Transform Far Infrared(FTFIR) spectrometer in nitrogen or vacuum environment at room temperature, respectively. The results show that distinct characteristic absorption peaks of glucose solutions are found at far-infrared range. Solutions of glucose with different concentrations show different absorption to terahertz wave. In consideration of works above, THz-TDS can provide a new method to identify glucose and its solutions of various concentrations.