日本地球惑星科学連合2018年大会

講演情報

[EE] ポスター発表

セッション記号 B (地球生命科学) » B-AO 宇宙生物学・生命起源

[B-AO01] アストロバイオロジー

2018年5月22日(火) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:薮田 ひかる(広島大学大学院理学研究科地球惑星システム学専攻)、杉田 精司(東京大学大学院理学系研究科地球惑星科学専攻)、深川 美里(名古屋大学、共同)、藤島 皓介(東京工業大学地球生命研究所)

[BAO01-P08] 熱水条件下におけるアミノ酸の研究 —ダイヤモンドアンビルによるその場観察加圧加熱実験—

久保 和希2、*岡本 和明1,2,3 (1.埼玉大学教育学部、2.埼玉大学大学院教育学研究科、3.東京学芸大学大学院連合学校教育学研究科)

キーワード:アミノ酸、熱水条件、DAC 実験

Amino acids are organic compounds that form the fundamental part of life. Proteins are formed by peptide binding and polymerization of amino acids. Amino acids can be polymerized in the ridge hydrothermal field. Therefore, it has been considered that the ridge hydrothermal activity might have played an important role for the origin and evolution of life. Previous hydrothermal experiments were done using cold sealed hydrothermal bombs and auto claves. Therefore the quenched run charges were observed after high P, and T experiments. In order to perform in-situ observation of the amino acids at high P and T condition, we have conducted diamond-anvils cell (DAC) experiments with laser-Raman analysis. Our preliminary experiments show that glycine is stable at 1 GPa, 100 ℃, and 1 GPa, 50 ℃, with a nagative P/T slope boundary. Above the stabily field boundary, it is decomposed to methylamine, CO2 and so on. The present study also shows that diglycine is stable much higher T conditions, 200 ℃ at 1 GPa. The present study concludes that the glycince can be stable in deeper part of cold hydrothermal field such as serpentinized mantle beneath the Lost city or Enceladus. The polymerized diglycine is also possible to stay in circulation of the cold hydrothermal zone.