Japan Geoscience Union Meeting 2016

Presentation information


Symbol B (Biogeosciences) » B-CG Complex & General

[B-CG09] Interrelation between Life, Water, Mineral, and Atmosphere

Mon. May 23, 2016 1:45 PM - 3:00 PM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Kentaro Nakamura(Department of Systems Innovation, School of Engineering, University of Tokyo), Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Ken Takai(Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology), Yuichiro Ueno(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Takeshi Naganuma(Graduate School of Biosphere Science), Takeshi Kakegawa(Graduate School of Science, Tohoku University), Tadashi Yokoyama(Department of Earth and Space Science, Graduate School of Science, Osaka University), Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Chair:Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University)

2:15 PM - 2:30 PM

[BCG09-03] Lysine polymerization on amorphous silica: A thermodynamic evaluation

*Nishii Akari1, Norio Kitadai1, Hitomi Tokimori, Ken Kurokawa1 (1.Tokyo Institute of Technology)

Keywords:Adsorption, Lysine, Silica

When, where and how did life on the Earth originate? To resolve that fundamental question, one must first ascertain the reactivity of biomolecules, and the response of reactivity to changing environmental conditions such as pH, temperature, dissolved composition, and mineral surfaces. Amino acids are building blocks of proteins, which are fundamental to life. Therefore, the polymerization behavior of amino acids has been a topic of many experimental and theoretical works (Shock, 1992).
This study focuses on thermodynamic effects of minerals on amino acid polymerization. To date, widely various oxide minerals and clays has been examined for their roles in this reaction (Cleaves et al., 2012). Results have demonstrated their positive influences with regard to reaction rate, peptide length, and the amounts of polymers synthesized. However, reported experiments have mostly emphasized catalytic properties of minerals. Consequently, in most cases, experiments have been terminated before polymerization reaches its steady state. It remains unclear whether minerals promote polymerization in thermodynamics as well as kinetics.
To examine the thermodynamic effects, we have evaluated adsorption behaviors of amino acids and peptides on minerals by using extended triple layer model (ETLM; Sverjensky and Fukushi, 2006). Obtained adsorption parameters are used, by combining thermodynamic parameters for amino acids and peptides in aqueous solution, to predict amino acid/peptide equilibria on mineral surfaces. In this presentation, we will present our findings for a lysine/amorphous silica system.