title: Formation and stability of complex organic compounds in space environments.
abstract: Complex organic compounds have been found in extraterrestrial bodies such as meteorites and comets. We confirmed the formation of complex organic compounds that contained amino acid precursors from a mixture of carbon monoxide (or methanol), ammonia and water by radiation or UV. Molecular weights of the complex organics were several thousands. Stability of the complex precursors was studied. When free amino acids were irradiated with gamma rays or synchrotron radiation, they easily decomposed. The complex precursors were, however, much more stable than free amino acid against irradiation. We propose to examine the formation and alteration of amino acid precursors in space by using exposed facility of ISS.
authors.affiliation: Department of Chemistry and Biotechnology, Yokohama National University.
authors.forename: Kensei
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Hisako
authors.initials: H
authors.lastname: Tonishi
authors.forename: Taiki
authors.initials: T
authors.lastname: Tsuboi
authors.forename: Nobushige
authors.initials: N
authors.lastname: Suzuki
authors.forename: Takeo
authors.initials: T
authors.lastname: Kaneko
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Takano
authors.forename: Yasuo Yasuyuki
authors.initials: YY
authors.lastname: Muramatsu
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Hashimoto
authors.forename: Masamichi
authors.initials: M
authors.lastname: Yamashita
mesh_terms: D000596:Amino Acids / Q000138:chemical synthesis*; D000641:Ammonia / Q000737:chemistry; D002244:Carbon; D002248:Carbon Monoxide / Q000737:chemistry; D003359:Cosmic Radiation; D004307:Dose-Response Relationship, Radiation; D018559:Exobiology; D005118:Extraterrestrial Environment; D005720:Gamma Rays; D005998:Glycine; D020450:Heavy Ions; D000432:Methanol / Q000737:chemistry; D013026:Space Flight; D017356:Synchrotrons; D014867:Water / Q000737:chemistry
chemical_list: D000596:Amino Acids; D014867:Water; D002244:Carbon; D000641:Ammonia; D002248:Carbon Monoxide; D005998:Glycine; D000432:Methanol