Amino-acid synthesis in carbonaceous meteorites by aqueous alteration of polycyclic aromatic hydrocarbons

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Amino Acids, Carbonaceous Meteorites, Cosmochemistry, Cyclic Hydrocarbons, Protein Synthesis, Aromatic Compounds, Interstellar Matter, Meteoritic Composition, Reaction Kinetics

Scientific paper

Polycyclic aromatic hydrocarbons (PAHs) may represent the starting material for aqueous alteration which leads to the formation of amino acids and other water-soluble organic compounds in meteorite parent bodies. Calculations are presented here of the distribution of aqueous organic compounds in metastable equilibrium with representative PAHs as functions of the fugacities of O2, CO2, and NH3. The results reported here for pyrene and fluoranthene, two PAHs with different structures but the same stoichiometry, differ greatly but indicate that the formation of amino and carboxylic acids is energetically favorable at probable parent-body alteration conditions. The actual reaction mechanisms involved could be revealed by consideration of isotope data for PAHs, amino acids, other organic compounds, and carbonates in carbonaceous chondrites.

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