Stereoisomers of isovaline in the Murchison meteorite

Details Stereoisomers of isovaline in the Murchison meteorite Stereoisomers of isovaline in the Murchison meteorite

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1571p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Nov. 1975, p. 1571-1573.

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12

Amino Acids, Carbonaceous Chondrites, Isomers, Meteoritic Composition, Abiogenesis, Extraterrestrial Life, Geochemistry, Stereochemistry

Scientific paper

Isovaline is present in the Murchison meteorite as a racemic mixture (about equal concentrations of the R and S enantiomers). Since isovaline does not have a hydrogen atom on its asymmetric alpha-carbon atom, the racemic mixture could not have formed by commonly accepted mechanisms of racemization. Thus, isovaline in the meteorite most probably was synthesized as a racemic mixture and is not the result of the racemization of either the R or S enantiomer. Other chiral amino acids in the meteorite are present as racemic mixtures, and were probably synthesized in a similar manner by abiotic, extraterrestrial processes.

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