Polarized Raman spectra and intensities of aliphatic amino acids |
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| Affiliation: | 1. PG & Research Department of Physics, Arignar Anna Govt. Arts College, Cheyyar 604407, Tamil Nadu, India;2. Department of Physics, Dr Ambedkar Govt. Arts College, Vyasarpadi, Chennai 600039, Tamil Nadu, India;3. PG & Research Department of physics, Urumu Dhanalakshmi College, Thiruchirappalli 620019, Tamil Nadu, India;4. Department of Physics, School of Advanced Sciences, VIT, Chennai 600127, Tamil Nadu, India;1. Department of Mining and Metallurgy Engineering, Amirkabir University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;3. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;4. Department of Mechanical Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran;5. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;1. Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. School of Material Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;3. Department of Marine Biology, Akwa Ibom State University, Uyo, Nigeria;1. Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, P.O. Box 11010, 250 Wu-Xing Street, Taipei City, Taiwan;2. Department of Materials Science & Engineering, National Chiao Tung University, P.O. Box 30010, 1001 University Rd., Hsinchu, Taiwan;3. Interdisciplinary Institute of Neuroscience and Technology, Zhejiang University, No.866 Yuhangtang Rd., Hangzhou, Zhejiang Province 310058, China;4. Department of Biomedical Engineering, National Yang Ming University, P.O. Box 11210, 155, Sec. 2, Linog St., Taipei, Taiwan |
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| Abstract: | Raman spectra of aliphatic α-l-amino acids, glycine, alanine, and valine were re-investigated both in aqueous solution and deuterium oxide solution. The spectra were taken of the zwitterionic and of the completely deprotonated form of the amino acids. Spectra of leucine and isoleucine were studied in water at the isoelectric point. Spectra were recorded both with parallel and perpendicular polarization and the isotropic and anisotropic scattering components were isolated.The integrated intensities of CH stretch, CC stretch and carboxylate bend vibrations are discussed. Linear relations between the number of CC and CH bonds and the total scattered intensity in the appropriate spectral regions are observed. The sum over the carboxylate modes shows characteristic intensities for the first three members of the aliphatic amino acids.An increase of isotropic scattering of ϱco2 near 510 cm−1 with increasing chain length of the amino acid (or with increasing concentration) is interpreted as the result of micelle formation. |
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