[B-BG02] 生命-水-鉱物-大気相互作用

[BBG02-03] Photochemical synthesis of Amino Acid from Nitrous Oxide on Early Mars

*蔵 暁鳳¹、河出 和香¹、上野 雄一郎^1,2,3 (1.東京工業大学 理学院 地球惑星科学系、2.東京工業大学地球生命研究所、3.海洋研究開発機構)

キーワード：アミノ酸合成、大気　光化学、 初期火星

Recent studies suggest that early Mars may have been a clement environment for emergence of life. The geological evidence suggests that liquid water was present transiently on early Mars. Organic molecules as wells as nitrogen-bearing compounds have been discovered on Mars, hence the building block of life including amino acids may have been produced on early Mars. We report results of new experimental study on nitrogen photochemistry driven by UV started from the initial gas containing CO and N₂O, which could possibly exist in the atmosphere on early Mars because of the low oxygen fugacity of Martian mantle. The results demonstrated that carboxylic acids, ammonia, methylamine, as well as amino acids were produced under the presence of water. The product amino acids include glycine, serine and β-alanine when UV was penetrated to the surface of liquid water. The results suggest that NH₃ can be synthesized by photochemistry in the atmosphere containing N₂O+CO+H₂O, and could be an important intermediate to synthesize the amino acid.