Nonprotein amino acids in the murchison meteorite.

  title={Nonprotein amino acids in the murchison meteorite.},
  author={Keith A. Kvenvolden and James G. Lawless and Cyril Ponnamperuma},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={68 2},
Twelve nonprotein amino acids appear to be present in the Murchison meteorite. The identity of eight of them has been conclusively established as N-methylglycine, beta-alanine, 2-methylalanine, alpha-amino-n-butyric acid, beta-amino-n-butyric acid, gamma-amino-n-butyric acid, isovaline, and pipecolic acid. Tentative evidence is presented for the presence of N-methylalanine, N-ethylglycine, beta-aminoisobutyric acid, and norvaline. These amino acids appear to be extraterrestrial in origin and… Expand
Amino acids in the Murchison meteorite
Abstract Continued investigation of the Murchison meteorite by gas chromatography combined with mass spectrometry has led to the characterization of at least 17 amino acids in addition to the 18Expand
Amino acids in the Martian meteorite Nakhla.
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. Expand
Non-racemic amino acids in the Murray and Murchison meteorites.
The alpha-methyl-alpha-amino alkanoic acids could have been significant in the origin of terrestrial homochirality given their resistance to racemization and the possibility for amplification of their enantiomeric excesses suggested by the strong tendency of their polymers to form chiral secondary structure. Expand
Amino acids of the Murchison meteorite: II. Five carbon acyclic primary beta-, gamma-, and delta-amino alkanoic acids.
Thirty-six amino acids have now been positively identified in the Murchison meteorite, 17 of which are apparently unique to carbonaceous chondrites, consistent with a synthetic process involving random combination of single-carbon precursors. Expand
Acid-labile amino acid precursors in the Murchison meteorite
  • J. Cronin
  • Chemistry, Medicine
  • Origins of life
  • 2004
The amino acid content of a hot water extract of the Murchison meteorite can be increased by over 100 per cent by subjecting the extract to acid hydrolysis. The acid-labile compounds in the extractExpand
α-Hydroxycarboxylic acids in the Murchison meteorite
A VARIETY of indigenous organic compounds have been detected in carbonaceous meteorites1–6, and of these, the amino acids have been the most extensively studied1,7–11. In addition to the amino acidsExpand
α-Aminoisobutyric Acid and Isovaline in Tokyo Bay Sediments
Abstract Two nonprotein amino acids, 2-amino-2-methylpropionic acid (α-aminoisobutyric acid, αAiBA) and 2-amino-2-methylbutanoic acid (isovaline, iVal) were found in modern Tokyo bay sedimentsExpand
Amino Acids Indigenous to the Murray Meteorite
Analysis of the Murray meteorite, a type II carbonaceous chondrite, has led to the identification of 17 amino acids that suggest that these amino acids are extraterrestrial in origin. Expand
Distribution and enantiomeric composition of amino acids in the Murchison meteorite
Early determinations of the amino acid distribution in water extracts of the Murchison meteorite revealed unusual amino acids, including isovaline (Ival), α-aminoisobutyric acid (α-Aiba) andExpand
Aliphatic amines in the Murchison meteorite
ANALYSES of the organic compounds found in the Murchison meteorite, a C2 chondrite that fell in Australia in 1969, have provided much new information about extraterrestrial organic chemicalExpand