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Terahertz, infrared and Raman absorption spectra of tyrosine enantiomers and racemic compound
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2021-02-23 , DOI: 10.1016/j.saa.2021.119611
Meidie Hu , Mingjie Tang , Huabin Wang , Mingkun Zhang , Shiping Zhu , Zhongbo Yang , Shengling Zhou , Hua Zhang , Jiao Hu , Yuansen Guo , Xiao Wei , Yunsheng Liao

The application of terahertz (THz)-based techniques in biomolecule study is very promising but still in its infancy. In the present work, we employed THz time-domain spectroscopy (THz-TDS) and THz time-domain attenuated total reflection (THz-TD-ATR) spectroscopy to investigate the properties of tyrosine (Tyr) enantiomers (L- and D-Tyr) and racemate (DL-Tyr) in solid state and aqueous solutions, respectively. THz absorption spectra of solid L- and D-Tyr show similar absorption spectra with peaks at 0.95, 1.92, 2.06 and 2.60 THz, which are obviously different from the spectrum of DL-Tyr with peaks at 1.5, 2.15 and 2.40 THz. In contrast, although THz absorption spectra of L-Tyr solution and D-Tyr solution are similar and different from the spectrum of DL-Tyr solution, both of them have no observable peaks. Interestingly, it was found that the solution containing equal amounts of L- and D-Tyr has a similar spectrum as that of DL-Tyr solution, as far as the mass concentrations of the two types of solutions are kept the same. On other hand, solid L-, D- and DL-Tyr were also investigated with infrared spectroscopy and Raman spectroscopy, respectively. The results show that the spectra of L- and D-Tyr can be regarded the same but they are slightly different from the spectrum of DL-Tyr. With the aid of principal component analysis (PCA), the difference between L-/D-Tyr and DL-Tyr can be confirmed without any ambiguity. Overall, this work systematically interrogated and evaluated the performance of THz-based techniques in the detection of the chirality of tyrosine.



中文翻译:

酪氨酸对映异构体和外消旋化合物的太赫兹,红外和拉曼吸收光谱

基于太赫兹(THz)的技术在生物分子研究中的应用非常有前途,但仍处于起步阶段。在目前的工作中,我们采用太赫兹时域光谱(THz-TDS)和太赫兹时域衰减全反射(THz-TD-ATR)光谱研究酪氨酸(Tyr)对映异构体(L-和D-Tyr)的性质。 )和外消旋体(DL-Tyr)分别处于固态和水溶液中。固体L-和D-Tyr的THz吸收光谱显示出相似的吸收光谱,其峰值分别为0.95、1.92、2.06和2.60 THz,与DL-Tyr的光谱分别具有1.5、2.15和2.40 THz的峰明显不同。相反,尽管L-Tyr溶液和D-Tyr溶液的THz吸收光谱与DL-Tyr溶液的光谱相似且不同,但它们都没有可观察到的峰。有趣的是,已经发现,含有相同量的L-和D-Tyr的溶液具有与DL-Tyr溶液相似的光谱,只要两种溶液的质量浓度保持相同即可。另一方面,还分别通过红外光谱和拉曼光谱研究了固体L-,D-和DL-Tyr。结果表明,L-和D-Tyr的光谱可以视为相同,但与DL-Tyr的光谱略有不同。借助主成分分析(PCA),可以毫无疑问地确定L- / D-Tyr和DL-Tyr之间的差异。总的来说,这项工作系统地研究和评估了基于THz的技术在酪氨酸手性检测中的性能。只要两种溶液的质量浓度保持相同即可。另一方面,还分别通过红外光谱和拉曼光谱研究了固体L-,D-和DL-Tyr。结果表明,L-和D-Tyr的光谱可以视为相同,但与DL-Tyr的光谱略有不同。借助主成分分析(PCA),可以毫无疑问地确定L- / D-Tyr和DL-Tyr之间的差异。总的来说,这项工作系统地研究和评估了基于THz的技术在酪氨酸手性检测中的性能。只要两种溶液的质量浓度保持相同即可。另一方面,还分别通过红外光谱和拉曼光谱研究了固体L-,D-和DL-Tyr。结果表明,L-和D-Tyr的光谱可以视为相同,但与DL-Tyr的光谱略有不同。借助主成分分析(PCA),可以毫无疑问地确定L- / D-Tyr和DL-Tyr之间的差异。总的来说,这项工作系统地研究和评估了基于THz的技术在酪氨酸手性检测中的性能。结果表明,L-和D-Tyr的光谱可以视为相同,但与DL-Tyr的光谱略有不同。借助主成分分析(PCA),可以毫无疑问地确定L- / D-Tyr和DL-Tyr之间的差异。总的来说,这项工作系统地研究和评估了基于THz的技术在酪氨酸手性检测中的性能。结果表明,L-和D-Tyr的光谱可以视为相同,但与DL-Tyr的光谱略有不同。借助主成分分析(PCA),可以毫无疑问地确定L- / D-Tyr和DL-Tyr之间的差异。总的来说,这项工作系统地研究和评估了基于THz的技术在酪氨酸手性检测中的性能。

更新日期:2021-03-07
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