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Asymmetric synthesis of amino acid precursors in interstellar complex organics by circularly polarized light

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Title: Asymmetric synthesis of amino acid precursors in interstellar complex organics by circularly polarized light
Authors: Takano, Yoshinori Browse this author
Takahashi, Jun-ichi Browse this author
Kaneko, Takeo Browse this author
Marumo, Katsumi Browse this author
Kobayashi, Kensei Browse this author
Keywords: Asymmetric synthesis
amino acid precursors
complex organics
carbonaceous meteorite
circularly polarized light
exogenous production
Issue Date: 15-Feb-2007
Publisher: Elsevier
Journal Title: Earth and Planetary Science Letters
Volume: 254
Issue: 1-2
Start Page: 106
End Page: 114
Publisher DOI: 10.1016/j.epsl.2006.11.030
Abstract: The asymmetric synthesis of amino acid precursors from complex organics have been performed. A gaseous mixture of carbon monoxide, ammonia and water (molecules which are among those identified in the interstellar medium) was irradiated with 3.0 MeV protons to obtain amino acid precursors within high-molecular-weight complex organics of up to 3,000 Da. The amino acid precursor products synthesized were then irradiated with right (R-) or left (L-) ultraviolet circularly polarized light (UV-CPL) obtained from a synchrotron radiation (SR) source. Glycine was a predominant product, and number of chiral amino acids including alanine were identified following acid hydrolysis. R-UV-CPL preferentially produced D-alanine, while L-UV-CPL yielded more L-alanine. Enantiomeric excesses (% D - % L) of + 0.44 % and - 0.65 % were obtained by R-UV-CPL and L-UV-CPL, respectively. These results imply that the origins of chirality in meteoritic amino acids could be accounted for by the formation of asymmetric amino acid precursors from extraterrestrial complex organics by CPL in space.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高野 淑識

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