The carbon isotopic distribution of Murchison amino acids

Details The carbon isotopic distribution of Murchison amino acids The carbon isotopic distribution of Murchison amino acids

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004gecoa..68.4963p&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 68, Issue 23, p. 4963-4969.

Computer Science

21

Scientific paper

The δ13C values of thirty-four individual amino acids and two pyridine carboxylic acids have been obtained fromthe Murchison meteorite. They were found to range from +4.9 to +52.8‰, with statistically significant differences observed both within and between amino acid subgroups. The 13C content of α-amino acids declines with increasing chain length, a trend similar to the ones previously observed for carboxylic acids and alkanes. Also 2-methyl-2-amino acids were found to be heavier in 13C than the corresponding 2-H homologues. The3-, 4-, and 5-amino acids do not show a comparable declining trend in δ13C values and neither do the amino dicarboxylic acids. This variability in δ 13C values can be interpreted as to indicate that the synthetic histories of soluble organics in meteorites may have been diverse even within groups of compounds with very similar functional group composition.

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