氨基酸及其水合物的太赫兹光谱识别研究
首发时间:2018-08-15
摘要:太赫兹(THz)光谱对分子的集体振动模式和分子间弱相互作用非常敏感,因此可以根据其吸收谱的差异实现分子无水及水合状态的识别。本文利用太赫兹时域光谱(THz-TDS)技术分别对四种极性不同的氨基酸(甘氨酸(Gly)、L-丙氨酸(L-Ala)、L-丝氨酸(L-Ser)、L-酪氨酸(L-Tyr))的无水和水合形式进行检测。发现各无水氨基酸及其水合物的太赫兹吸收谱图均存在明显差异,且差异程度与氨基酸亲水性指数呈正相关。结合傅里叶变换红外光谱(FTIR)、热重分析(TG)和X射线衍射技术(XRD)从分子基团、热力学及晶体结构角度对这四组氨基酸进行表征分析,进一步验证太赫兹光谱的识别优越性及实验结果的准确性。
关键词: 材料物理与化学 太赫兹时域光谱 氨基酸 结晶水 吸收峰
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Identification of Amino Acids and Their Hydrates by Terahertz Spectral
Abstract:Terahertz(THz) spectroscopy is very sensitive to the collective vibrational mode of molecules and weak interaction between molecules. Therefore, the identification of anhydrous and hydration states of molecular can be realized according to the difference of terahertz absorption spectra. In this paper, the technique of terahertz time-domain spectroscopy (THz-TDS) was used to detect the anhydrous and hydrated forms of four kinds of amino acids (glycine, L-alanine, L-serine, L-tyrosine)owning different polarities. Based on the results mentioned above,We find that there is a significant difference between the absorption spectrums of amino acids and corresponding their Hydrate, and the degree of difference mentioned above is positively correlated with the amino acid hydrophilicity index. Furthermore,In ordertoverify the recognitionsuperiority and accuracy of experimental results of terahertz spectroscopy , Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis (TG)and X-ray diffraction techniques(XRD) were used to characterize and analyze the four groups of amino acid from perspective of molecular groups, thermodynamic properties and crystal structure.
Keywords: Material physics and chemistry terahertz time-domain spectroscopy amino acid water of crystallization absorption peak
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