論文

査読有り 本文へのリンクあり
2021年12月1日

Space Exposure of Amino Acids and Their Precursors during the Tanpopo Mission

Astrobiology
  • Kensei Kobayashi
  • ,
  • Hajime Mita
  • ,
  • Yoko Kebukawa
  • ,
  • Kazumichi Nakagawa
  • ,
  • Takeo Kaneko
  • ,
  • Yumiko Obayashi
  • ,
  • Tomohito Sato
  • ,
  • Takuya Yokoo
  • ,
  • Saaya Minematsu
  • ,
  • Hitoshi Fukuda
  • ,
  • Yoshiyuki Oguri
  • ,
  • Isao Yoda
  • ,
  • Satoshi Yoshida
  • ,
  • Kazuhiro Kanda
  • ,
  • Eiichi Imai
  • ,
  • Hajime Yano
  • ,
  • Hirofumi Hashimoto
  • ,
  • Shin Ichi Yokobori
  • ,
  • Akihiko Yamagishi

21
12
開始ページ
1479
終了ページ
1493
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1089/ast.2021.0027

Amino acids have been detected in extraterrestrial bodies such as carbonaceous chondrites (CCs), which suggests that extraterrestrial organics could be the source of the first life on Earth, and interplanetary dust particles (IDPs) or micrometeorites (MMs) are promising carriers of extraterrestrial organic carbon. Some amino acids found in CCs are amino acid precursors, but these have not been well characterized. The Tanpopo mission was conducted in Earth orbit from 2015 to 2019, and the stability of glycine (Gly), hydantoin (Hyd), isovaline (Ival), 5-ethyl-5-methylhydantoin (EMHyd), and complex organics formed by proton irradiation from CO, NH3, and H2O (CAW) in space were analyzed by high-performance liquid chromatography and/or gas chromatography/mass spectrometry. The target substances showed a logarithmic decomposition over 1-3 years upon space exposure. Recoveries of Gly and CAW were higher than those of Hyd, Ival, and EMHyd. Ground simulation experiments showed different results: Hyd was more stable than Gly. Solar ultraviolet light was fatal to all organics, and they required protection when carried by IDPs/MMs. Thus, complex amino acid precursors (such as CAW) were possibly more robust than simple precursors during transportation to primitive Earth. The Tanpopo 2 mission is currently being conducted to expose organics to more probable space conditions.

リンク情報
DOI
https://doi.org/10.1089/ast.2021.0027
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/34793260
共同研究・競争的資金等の研究課題
宇宙における有機物の形成・進化および生命の移動・居住可能性に関するアストロバイオロジー宇宙実験研究拠点
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85121350053&origin=inward 本文へのリンクあり
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85121350053&origin=inward
ID情報
  • DOI : 10.1089/ast.2021.0027
  • ISSN : 1531-1074
  • PubMed ID : 34793260
  • SCOPUS ID : 85121350053
  • 共同研究・競争的資金等の研究課題の業績ID : 32048039

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