Biology
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.496..167m&link_type=abstract
In: Exo-/astro-biology. Proceedings of the First European Workshop, 21 - 23 May 2001, ESRIN, Frascati, Italy. Eds.: P. Ehrenfreu
Biology
Biochemistry
Scientific paper
At present, the most promising scenario for the generation of biomolecular homochirality can be assumed to be "intensive" irradiation of potential precursor molecules with interstellar energetic electromagnetic radiation that is circularly polarized. However, in this scenario one is confronted with the paradoxical condition that organic precursor molecules photolyse considerably under irradiation with UV/VUV photons. In order to study the physico-chemical interaction of circularly polarized electromagnetic radiation with chiral organic molecules our research focuses on the effect of electromagnetic radiation on a proteic amino acid detected in the Murchison meteorite. Solid films of (D,L)-leucine were deposited onto MgF2 windows and irradiated with synchrotron right and left circularly polarized light in the far ultraviolet region. The remaining amino acids were extracted and analysed by capillary electrophoresis and GC-MS. By variation of the photon's energy the anisotropy factor g was determined as a function of the wavelength, from which conditions to obtain enantioenrichments will be determined. The principles of the expriment will be introduced with respect to current models on the origin of biomolecular homochirality.
Alcaraz Christian
Barbier Bernard
Brack André
Chabin Annie
Jacquet Romain
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