Origins of Life and Evolution of Biospheres

, Volume 45, Issue 1, pp 149–161

Anisotropy-Guided Enantiomeric Enhancement in AlanineUsing Far-UV Circularly Polarized Light

  • Cornelia Meinert
  • Patrick Cassam-Chenaï
  • Nykola C. Jones
  • Laurent Nahon
  • Søren V. Hoffmann
  • Uwe J. Meierhenrich
ORIGINS 2014

DOI: 10.1007/s11084-015-9413-x

Cite this article as:
Meinert, C., Cassam-Chenaï, P., Jones, N.C. et al. Orig Life Evol Biosph (2015) 45: 149. doi:10.1007/s11084-015-9413-x

Abstract

All life on Earth is characterized by its asymmetry – both the genetic material and proteins are composed of homochiral monomers. Understanding how this molecular asymmetry initially arose is a key question related to the origins of life. Cometary ice simulations, l-enantiomeric enriched amino acids in meteorites and the detection of circularly polarized electromagnetic radiation in star-forming regions point to a possible interstellar/protostellar generation of stereochemical asymmetry. Based upon our recently recorded anisotropy spectra g(λ) of amino acids in the vacuum-UV range, we subjected amorphous films of racemic 13C-alanine to far-UV circularly polarized synchrotron radiation to probe the asymmetric photon-molecule interaction under interstellar conditions. Optical purities of up to 4 % were reached, which correlate with our theoretical predictions. Importantly, we show that chiral symmetry breaking using circularly polarized light is dependent on both the helicity and the wavelength of incident light. In order to predict such stereocontrol, time-dependent density functional theory was used to calculate anisotropy spectra. The calculated anisotropy spectra show good agreement with the experimental ones. The European Space Agency’s Rosetta mission, which successfully landed Philae on comet 67P/Churyumov-Gerasimenko on 12 November 2014, will investigate the configuration of chiral compounds and thereby obtain data that are to be interpreted in the context of the results presented here.

Keywords

Amino acids Anisotropy Homochirality Asymmetric photolysis Origins of life Chiral photons 

Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Cornelia Meinert
    • 1
  • Patrick Cassam-Chenaï
    • 2
  • Nykola C. Jones
    • 3
  • Laurent Nahon
    • 4
  • Søren V. Hoffmann
    • 3
  • Uwe J. Meierhenrich
    • 1
  1. 1.Institut de Chimie de Nice ICN, CNRS UMR 7272Université de Nice Sophia AntipolisNiceFrance
  2. 2.Laboratoire J. A. Dieudonné, CNRS UMR 7351Université de Nice Sophia AntipolisNiceFrance
  3. 3.Institute for Storage Ring Facilities (ISA), Dept. of Physics and AstronomyAarhus UniversityAarhus CDenmark
  4. 4.Synchrotron SOLEILGif-sur-YvetteFrance

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