Japan Geoscience Union Meeting 2018

Presentation information

[EE] Evening Poster

B (Biogeosciences) » B-AO Astrobiology & the Origin of Life

[B-AO01] Astrobiology

Tue. May 22, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Hikaru Yabuta(Hiroshima University, Department of Earth and Planetary Systems Science), Seiji Sugita(Department of Earth and Planetary Science, Graduate School of Science Sciece, The University of Tokyo), Misato Fukagawa(名古屋大学, 共同), Fujishima Kosuke(Tokyo Institute of Technology, Earth-Life Science Institute)

[BAO01-P10] Ground-based simulation of Enceladus fly-through plume sampling and analysis using ultra-low density aerogel

*Fujishima Kosuke1, Wataru Takahagi2,4, Kaito Seo4, Hiroki Saito4, yayoi Hongo1, Makoto Tabata5, Takazo Shibuya2, Ken Takai2, Yoshinori Takano2, Hajime Yano3 (1.Tokyo Institute of Technology, Earth-Life Science Institute, 2.Japan Agency for Marine-Earth Science and Technology, 3.Japan Aerospace Exploration Agency, Institute of Space and Astronautic Science, 4.Keio Univ., 5.Graduate School of Science, Chiba University)

Keywords:life detection, hypervelocity impact, organic molecules, peptide, silica aerogel, spaceflight mission

Understanding the variety and the distribution of the building blocks of life in space is one of the important scientific themes for Astrobiology. In situ detection of organic molecules from extraterrestrial bodies thus provide insight into ongoing chemical evolution of building blocks of life, and possibly the detection of extraterrestrial life itself. Here we conducted a ground-based simulation of Enceladus fly-through plume sampling, extraction and analysis of two simple organic molecules, Glycine (Gly) and Glycyl-L-alanine (GlyAla) dipeptide. Hypervelocity impact experiment was carried out at JAXA/ISAS using pure Gly and GlyAla crystal as well as freeze-dried sample of 10% w/w organic-NaCl mixture. Approximately 5 mg of powder samples are placed into sabot projectile and accelerated to a speed of 4-6 km/sec and captured by ultra-low density (10 mg/cc) hydrophobic and hydrophilic silica aerogels. Aerogels with impact tracks are transferred to order-made aerogel container made of space compatible material polyetheretherketone (PEEK) and soaked by 5 ml 75% acetonitrile water solution for sufficient diffusion of organic molecules. Extracted solution was freeze-dried and resuspended in 100 μl water and analyzed using LC-QTOF-MS. So far, we have obtained LC profile/MS spectra corresponding to intact GlyAla from both hydrophobic and hydrophilic aerogel with sample recovery rate of approximately 0.1%. Ongoing analysis will further provide information on Glycine as well as degree of impact-driven organic alteration to demonstrate the capability ultra-low density aerogel for analysis of astrobiologically-relevant organic molecules in future spaceflight missions.