The Strecker synthesis as a source of amino acids in carbonaceous chondrites - Deuterium retention during synthesis

Details The Strecker synthesis as a source of amino acids in carbonaceous chondrites - Deuterium retention during synthesis The Strecker synthesis as a source of amino acids in carbonaceous chondrites - Deuterium retention during synthesis

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4713l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, p. 4713

Computer Science

17

Carbonaceous Chondrites, Amino Acids, Deuterium Compounds, Meteoritic Composition, Synthesis (Chemistry), Murchison Meteorite, Quantitative Analysis

Scientific paper

Deuterium-enriched amino acids occur in the Murchison carbonaceous chondrite. Synthesis from D-enriched interstellar precursors by Strecker reactions during aqueous alteration of the parent body has been proposed. To test this hypothesis, we have measured the retention of deuterium in amino acids produced from HCN, NH3, and formaldehyde-D2, acetaldehyde-D4, and acetone-D6 in H2O. The isotopic label is 50 to 98 percent retained, with variations in retentivity depending on the amino acid and the reaction conditions. If amino acids, once formed on the parent body by the Strecker synthesis, lose no deuterium by subsequent exchange with water or H-bearing minerals, then the observed deuterium isotopic composition of Murchison amino acids represents as much as 50 percent or more of the enrichments inherited from their interstellar precursors. Imino diacids are prominent side products of the Strecker synthesis which have not been reported in carbonaceous chondrites.

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