Document Detail

Amino acids in the Martian meteorite Nakhla.
MedLine Citation:
PMID:  10430856     Owner:  NLM     Status:  MEDLINE    
A suite of protein and nonprotein amino acids were detected with high-performance liquid chromatography in the water- and acid-soluble components of an interior fragment of the Martian meteorite Nakhla, which fell in Egypt in 1911. Aspartic and glutamic acids, glycine, alanine, beta-alanine, and gamma-amino-n-butyric acid (gamma-ABA) were the most abundant amino acids detected and were found primarily in the 6 M HCl-hydrolyzed, hot water extract. The concentrations ranged from 20 to 330 parts per billion of bulk meteorite. The amino acid distribution in Nakhla, including the D/L ratios (values range from <0.1 to 0.5), is similar to what is found in bacterially degraded organic matter. The amino acids in Nakhla appear to be derived from terrestrial organic matter that infiltrated the meteorite soon after its fall to Earth, although it is possible that some of the amino acids are endogenous to the meteorite. The rapid amino acid contamination of Martian meteorites after direct exposure to the terrestrial environment has important implications for Mars sample-return missions and the curation of the samples from the time of their delivery to Earth.
D P Glavin; J L Bada; K L Brinton; G D McDonald
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  96     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1999 Aug 
Date Detail:
Created Date:  1999-09-09     Completed Date:  1999-09-09     Revised Date:  2010-09-13    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  8835-8     Citation Subset:  IM; S    
Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 93093-0212, USA.
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MeSH Terms
Alanine / analysis
Amino Acids / analysis*
Aspartic Acid / metabolism
Glutamic Acid / analysis
Glycine / analysis
beta-Alanine / analysis
gamma-Aminobutyric Acid / analysis
Reg. No./Substance:
0/Amino Acids; 107-95-9/beta-Alanine; 56-12-2/gamma-Aminobutyric Acid; 56-40-6/Glycine; 56-41-7/Alanine; 56-84-8/Aspartic Acid; 56-86-0/Glutamic Acid
J L Bada / U CA San Diego, La Jolla

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