Carbon isotope composition of individual amino acids in the Murchison meteorite View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1990-11

AUTHORS

M. H. Engel, S. A. Macko, J. A. Silfer

ABSTRACT

A SIGNIFICANT portion of prebiotic organic matter on the early Earth may have been introduced by carbonaceous asteroids and comets1. The distribution and stable-isotope composition of individual organic compounds in carbonaceous meteorites, which are thought to be derived from asteroidal parent bodies, may therefore provide important information concerning mechanistic pathways for prebiotic synthesis2 and the composition of organic matter on Earth before living systems developed3. Previous studies11, 12 have shown that meteorite amino acids are enriched in 13C relative to their terrestrial counterparts, but individual species were not distinguished. Here we report the 13C contents of individual amino acids in the Murchison meteorite. The amino acids are enriched in 13C, indicating an extraterrestrial origin. Alanine is not racemic, and the 13C enrichment of its D- and L-enantiomers implies that the excess of the L-enantiomer is indigenous rather than terrestrial contamination, suggesting that optically active materials were present in the early Solar System before life began. More... »

PAGES

47-49

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/348047a0

DOI

http://dx.doi.org/10.1038/348047a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039559219

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11536470


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