Temperature Dependence of Terahertz Spectra of Amino Acid
YU Jiang-ping1, LI Chun2, YI Wen-ting1, JIN Biao-bing2, LIU Yun-fei1, JIANG Ling1*
1. College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
2. School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
Abstract：We employed terahertz time domain spectra (THz-TDS) to measure the spectra of L-Asparagine，L-Cysteine，L-Alanine and L-Tyrosine in the frequency range of 0.5～2 THz at different temperatures. We measured the terahertz absorption spectra of amino acids at room temperature, 250, 200, 150, 100, 70, 40, 10 and 4.5 K by cooling the samples. The absorption peaks of the four amino acids in the low frequency range (0.5～2 THz) were demonstrated by Fourier transform infrared spectroscopy (FTIR) at room temperature, and the range of high frequency band (3～6 THz) was measured by Raman strength of these four amino acids at room temperature using Raman spectroscopy. Measurement results indicated that the temperature variation had an important effect on the absorption spectra. When the temperature falled, the absorption peak shifted to higher frequencies, and several new absorption peaks appeared. Aliphatic and aromatic amino acid displayed different responses in the line width and the absorption strength. Furthermore, we used the quantum chemistry Gaussian 09 software package to calculate the THz spectra of one molecule and unit cell of L-Asparagine and L-Tyrosine at room temperature by density functional theory. The calculation results indicate that intermolecular vibration and rotation strongly influence the absorption in THz frequencies for L-Asparagine and L-Tyrosine.
Key words：Terahertz spectroscopy; Amino acid; Blue shift; Raman spectroscopy
虞江萍，李 春，易雯婷，金飚兵，刘云飞，蒋 玲. 氨基酸的太赫兹光谱温度相关性研究[J]. 光谱学与光谱分析, 2018, 38(02): 386-393.
YU Jiang-ping, LI Chun, YI Wen-ting, JIN Biao-bing, LIU Yun-fei, JIANG Ling. Temperature Dependence of Terahertz Spectra of Amino Acid. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(02): 386-393.
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