Publicly Offered Research
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Amino acids are essential building blocks of life, and ubiquitously found in carbonaceous chondrites.Their genesis and conversion have important implications on the origin of biomolecules, and the geochemical processes occurred in their parent bodies (carbonaceous planetesimals).I will investigate the conversion pathways of amino acids, for reaching a systematic understanding on the reaction pathways and kinetics of amino acid conversion. This will be used to evaluate the role of amino acids in chemical evolution and constrain the physico-chemical properties of the associated environments.
I have explored the geochemical processes that shaped organic distributions on the parent icy planetesimals of carbonaceous chondrite. In the past year, I further extended the model to the parent body of carbonaceous asteroid Ryugu. These research results have resulted in one published paper (Nature Communications, 2022) and one manuscript currently under review (Li et al., under review). Our major finding is that aqueous alteration can lead to complex behavior of organics on its parent body, including both synthetic and breakdown mechanisms. If the parent planetesimal is water/rock differentiated, the redox gradients between the water-rich mantle and water-depleted core can drive the decomposition of dicarboxylic amino acids to n-w-amino acids even at low temperature (e.g., 25 oC).
令和3年度が最終年度であるため、記入しない。
All 2022 2021 2020 Other
All Journal Article (1 results) (of which Int'l Joint Research: 1 results, Peer Reviewed: 1 results, Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 5 results, Invited: 2 results) Book (1 results) Remarks (1 results)
Nature Communications
Volume: 13 Issue: 1 Pages: 1-14
10.1038/s41467-022-32596-3
https://www.elsi.jp/en/news_events/highlights/2022/chemical_evolution_early_solar_system/
