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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...

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Autores principales: Takahashi, Jun-ichi, Shinojima, Hiroyuki, Seyama, Michiko, Ueno, Yuko, Kaneko, Takeo, Kobayashi, Kensei, Mita, Hajime, Adachi, Mashahiro, Hosaka, Masahito, Katoh, Masahiro
Formato: Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2009
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.
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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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