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Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser
One of the most attractive hypothesis for the origin of homochirality in terrestrial bioorganic compounds is that a kind of “chiral impulse” as an asymmetric excitation source induced asymmetric reactions on the surfaces of such materials such as meteorites or interstellar dusts prior to the existen...
Autores principales: | , , , , , , , , , |
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Formato: | Texto |
Lenguaje: | English |
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Molecular Diversity Preservation International (MDPI)
2009
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2738911/ https://www.ncbi.nlm.nih.gov/pubmed/19742124 http://dx.doi.org/10.3390/ijms10073044 |
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author | Takahashi, Jun-ichi Shinojima, Hiroyuki Seyama, Michiko Ueno, Yuko Kaneko, Takeo Kobayashi, Kensei Mita, Hajime Adachi, Mashahiro Hosaka, Masahito Katoh, Masahiro |
author_facet | Takahashi, Jun-ichi Shinojima, Hiroyuki Seyama, Michiko Ueno, Yuko Kaneko, Takeo Kobayashi, Kensei Mita, Hajime Adachi, Mashahiro Hosaka, Masahito Katoh, Masahiro |
author_sort | Takahashi, Jun-ichi |
collection | PubMed |
description | One of the most attractive hypothesis for the origin of homochirality in terrestrial bioorganic compounds is that a kind of “chiral impulse” as an asymmetric excitation source induced asymmetric reactions on the surfaces of such materials such as meteorites or interstellar dusts prior to the existence of terrestrial life (Cosmic Scenario). To experimentally introduce chiral structure into racemic films of amino acids (alanine, phenylalanine, isovaline, etc.), we irradiated them with linearly polarized light (LPL) from synchrotron radiation and circularly polarized light (CPL) from a free electron laser. After the irradiation, we evaluated optical anisotropy by measuring the circular dichroism (CD) spectra and verified that new Cotton peaks appeared at almost the same peak position as those of the corresponding non-racemic amino acid films. With LPL irradiation, two-dimensional anisotropic structure expressed as linear dichroism and/or linear birefringence was introduced into the racemic films. With CPL irradiation, the signs of the Cotton peaks exhibit symmetrical structure corresponding to the direction of CPL rotation. This indicates that some kinds of chiral structure were introduced into the racemic film. The CD spectra after CPL irradiation suggest the chiral structure should be derived from not only preferential photolysis but also from photolysis-induced molecular structural change. These results suggest that circularly polarized light sources in space could be associated with the origin of terrestrial homochirality; that is, they would be effective asymmetric exciting sources introducing chiral structures into bio-organic molecules or complex organic compounds. |
format | Text |
id | pubmed-2738911 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | Molecular Diversity Preservation International (MDPI) |
record_format | MEDLINE/PubMed |
spelling | pubmed-27389112009-09-08 Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser Takahashi, Jun-ichi Shinojima, Hiroyuki Seyama, Michiko Ueno, Yuko Kaneko, Takeo Kobayashi, Kensei Mita, Hajime Adachi, Mashahiro Hosaka, Masahito Katoh, Masahiro Int J Mol Sci Article One of the most attractive hypothesis for the origin of homochirality in terrestrial bioorganic compounds is that a kind of “chiral impulse” as an asymmetric excitation source induced asymmetric reactions on the surfaces of such materials such as meteorites or interstellar dusts prior to the existence of terrestrial life (Cosmic Scenario). To experimentally introduce chiral structure into racemic films of amino acids (alanine, phenylalanine, isovaline, etc.), we irradiated them with linearly polarized light (LPL) from synchrotron radiation and circularly polarized light (CPL) from a free electron laser. After the irradiation, we evaluated optical anisotropy by measuring the circular dichroism (CD) spectra and verified that new Cotton peaks appeared at almost the same peak position as those of the corresponding non-racemic amino acid films. With LPL irradiation, two-dimensional anisotropic structure expressed as linear dichroism and/or linear birefringence was introduced into the racemic films. With CPL irradiation, the signs of the Cotton peaks exhibit symmetrical structure corresponding to the direction of CPL rotation. This indicates that some kinds of chiral structure were introduced into the racemic film. The CD spectra after CPL irradiation suggest the chiral structure should be derived from not only preferential photolysis but also from photolysis-induced molecular structural change. These results suggest that circularly polarized light sources in space could be associated with the origin of terrestrial homochirality; that is, they would be effective asymmetric exciting sources introducing chiral structures into bio-organic molecules or complex organic compounds. Molecular Diversity Preservation International (MDPI) 2009-07-07 /pmc/articles/PMC2738911/ /pubmed/19742124 http://dx.doi.org/10.3390/ijms10073044 Text en © 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. http://creativecommons.org/licenses/by/3.0 This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Takahashi, Jun-ichi Shinojima, Hiroyuki Seyama, Michiko Ueno, Yuko Kaneko, Takeo Kobayashi, Kensei Mita, Hajime Adachi, Mashahiro Hosaka, Masahito Katoh, Masahiro Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title | Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title_full | Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title_fullStr | Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title_full_unstemmed | Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title_short | Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser |
title_sort | chirality emergence in thin solid films of amino acids by polarized light from synchrotron radiation and free electron laser |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2738911/ https://www.ncbi.nlm.nih.gov/pubmed/19742124 http://dx.doi.org/10.3390/ijms10073044 |
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