Experimental verification of photostability for free- and bound-amino acids exposed to γ-rays and UV irradiation

• Takano Yoshinori

  Institute for Marine Resources and Environment (MRE), National Institute for Advanced Industrial Science and Technology (AIST)

• Kaneko Takeo

  Department of Chemistry and Biotechnology, Yokohama National University

• Kobayashi Kensei

  Department of Chemistry and Biotechnology, Yokohama National University

• Hiroishi Daisuke

  Research Center for Nuclear Science and Technology, University of Tokyo

• Ikeda Hidematsu

  Research Center for Nuclear Science and Technology, University of Tokyo

• Marumo Katsumi

  Institute for Marine Resources and Environment (MRE), National Institute for Advanced Industrial Science and Technology (AIST)

Bibliographic Information

Other Title

• Experimental verification of photostability for free and bound amino acids exposed to ガンマ rays and UV irradiation

Abstract

The photo-stability of simulated free and bound amino acids exposed to photon sources of 1.2-1.3 MeV γ-rays from a ⁶⁰°C source and ultra-violet (UV) irradiation from a 10 eV deuterium lamp was examined. The free amino acids in aqueous solution were drastically decreased while the bound amino acids in aqueous solution were slightly decreased with the duration of γ-rays and UV irradiation. The apparent half-lives (t_1/2) of bound serine and threonine under γ-rays irradiation were more than 10.6 and 27.9 times as stable as the free amino acids, respectively. The photo-stability of bound amino acids was greater than that of free amino acids under irradiation by high-energy photons. These results strongly suggest that bound, but not free, amino acids could be found in extraterrestrial environments. Radio- or photo-alteration processes are mainly decomposition pathways, with the production of secondary amino acids via decomposition of the α-carboxylic group; β-alanine and γ-aminobutyric acids, α-decarboxylation products of aspartic acid and glutamic acid, respectively, were detected.

Journal

• Earth, Planets and Space

  Earth, Planets and Space 56 (7), 669-674, 2004

  Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences

Keywords

• Photostability
• free- and bound-amino acids
• irradiation experiment
• half-lives

Details

• CRID: 1390001206514080256
• NII Article ID: 10017464879
• NII Article ID: 130003781036
• NII Book ID: AA11211921
• DOI: 10.1186/bf03352529
• COI: 1:CAS:528:DC%2BD2cXnvVWit70%3D
• ISSN: 18805981
• ISSN: 13438832
• NDL BIB ID: 7046560
• Web Site: http://hdl.handle.net/10131/8197
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7046560
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352529.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352529/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352529
• Web Site: https://search.jamas.or.jp/link/ui/2004266200
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed