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García, A.* ; Yan, Y. ; Meinert, C.* ; Schmitt-Kopplin, P. ; Vinogradoff, V.* ; Viennet, J.C.* ; Remusat, L.* ; Bernard, S.* ; Righezza, M.* ; Le Sergeant d’Hendecourt, L.* ; Danger, G.*

Molecular diversity and amino acid evolution in simulated carbonaceous chondrite parent bodies.

ACS Earth Space Chem. 8, 606–615 (2024)

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In interplanetary bodies, organics are found originating from various environments. We replicate the solid-phase conditions in a laboratory to elucidate the step-by-step evolution of organic matter, spanning from dense molecular cloud ices to processes occurring within meteorite parent bodies. The focus of our work is on amino acids, considered as potential chemical tracers of secondary alteration on asteroids. Using gas chromatography and high-resolution mass spectrometry, trace amounts of amino acids are identified in a preaccretional organic analogue formed from a dense molecular ice analogue. This analogue was subsequently exposed to aqueous alteration. This induced an increase in the formation of α- and β-amino acids over time. Supported by high-resolution mass spectrometry data, the reactions involved sugars and amine compounds, followed by amino acid destruction due to the Maillard reaction, which consumes both sugars and amino acids. Surprisingly, a second phase of amino acid formation, specifically α-amino acids, was observed, indicating the potential occurrence of the Strecker reaction. We demonstrate the intricate chemical network occurring within the presence of molecular diversity, similar to what might occur during parent body alteration. Therefore, investigations on reactivity within meteorite parent bodies have to take into account their molecular diversity, recognizing potential cross-reactions, as demonstrated in this work.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Amino Acids ; Gas Chromatography ; Gc-ft-orbitrap-ms ; High-resolution Mass Spectrometry ; Ice Analogues ; Meteorite; Interstellar Ice; Ultraviolet-irradiation; Aqueous Alteration; Organic-matter; Chemistry; Resolution; Murchison; Analogs; Degradation; Pathways

ISSN (print) / ISBN 2472-3452

e-ISSN 2472-3452

Journal ACS Earth and Space Chemistry

Quellenangaben Volume: 8, Issue: 3, Pages: 606–615

Publisher American Chemical Society (ACS)

Publishing Place 1155 16th St, Nw, Washington, Dc 20036 Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Analytical BioGeoChemistry (BGC)

Grants Centre National d'Etudes Spatiales (CNES)
Centre National de la Recherche Francaise (CNRS)
Agence Nationale de la Recherche
EXCellence Initiative of Aix-Marseille Universite-A*Midex, a French "Investissements d'Avenir programme"
Region SUD Provence Alpes Cote d'Azur "Apog 2017"-PILSE
EU
European Research Council