Low-frequency Vibrational Modes in Small Polypeptides of Essential Amino Acids
| Autor: | Hamidreza Ghanbari Khorram, Zeinab Meivand, Alireza Kokabi, Tina Bayatian, Ehsan Ghorbani Rad |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Absorption (pharmacology) Absorption spectroscopy Terahertz radiation Low frequency 01 natural sciences Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Amino acid 010309 optics Crystallography chemistry Molecular vibration 0103 physical sciences Essential amino acid |
| Zdroj: | Optics and Spectroscopy. 127:434-445 |
| ISSN: | 1562-6911 0030-400X |
| Popis: | The length-dependent low-frequency terahertz absorption spectrum of the essential amino acid chains has been investigated. Since this special type of amino acids cannot be synthesized inside the human body, the feasibility of noninvasively monitoring their deficiency is of significant importance. Here, the considered chains consist of two to six identical essential amino acids forming homogeneous polypeptides. The terahertz vibrational modes are calculated for different chain sizes of these polypeptides. The low-frequency terahertz spectra show unique and specific absorption peaks. Several fascinating patterns for the chain-size-dependent position of the peaks are reported here that are feasible of being applied for their noninvasive detection. For instance, different shared and identical characteristics peaks are observed for the specific polypeptides which are independent of the chain-size. Furthermore, it is shown that the observed trends for the maximum populated peak in some of the essential polypeptides can be considered as a possible footprint for in the terahertz spectrum. |
| Databáze: | OpenAIRE |
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