Position-Specific Isotope Fractionation in Amino Acids Sorbed to Ice: Implications for the Preservation of Isotopologue Biosignatures

A.C. Fox, E. Martineau, G.S. Remaud & K. Freeman
Sorption to mineral surfaces is a key process that protects amino acids from oxidation and aids their polymerization into complex biomolecules. Sorption of neutral amino acids is driven by a combination of intermolecular forces, commonly through hydrogen bonds with surface functional groups. Substitutions of heavy isotopes are known to influence the strength of intermolecular interactions, but global (i.e., whole-molecule) C isotope fractionation associated with sorption is small (< 1 ‰). However, larger fractionation of C...
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