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Enantiomeric Excesses in Meteoritic Amino Acids
- J. Cronin, S. Pizzarello
- Chemistry, Medicine
- Science
- 14 February 1997
Gas chromatographic-mass spectral analyses of the four stereoisomers of 2-amino-2,3-dimethylpentanoic acid (DL-α-methylisoleucine and DL-α-methylalloisoleucine) obtained from the Murchison meteorite… Expand
Organic matter in meteorites: molecular and isotopic analyses of the Murchison meteorite.
Carbonaceous chondrites comprise a unique subset of meteorites. Two classes of carbonaceous chondrites, the so-called CI1 and CM2 chondrites, are particularly interesting, in part because of their… Expand
Amino acids in meteorites.
- J. Cronin, S. Pizzarello
- Chemistry, Medicine
- Advances in space research : the official journal…
- 1983
Carbonaceous chondrites carry a record of chemical evolution that is unparalleled among presently accessible natural materials. Within the complex suite of organic compounds that characterize these… Expand
Isotopic and molecular analyses of hydrocarbons and monocarboxylic acids of the Murchison meteorite.
- R. Krishnamurthy, S. Epstein, J. Cronin, S. Pizzarello, G. Yuen
- Chemistry, Medicine
- Geochimica et cosmochimica acta
- 1 November 1992
The monocarboxylic acids and hydrocarbons of the Murchison meteorite (CM2) were isolated for isotopic analysis. The nonvolatile hydrocarbons were analyzed as crude methanol and benzene-methanol… Expand
Isotopic analyses of nitrogenous compounds from the Murchison meteorite: ammonia, amines, amino acids, and polar hydrocarbons.
- S. Pizzarello, X. Feng, S. Epstein, J. Cronin
- Chemistry, Medicine
- Geochimica et cosmochimica acta
- 1 December 1994
The combined volatile bases (ammonia, aliphatic amines, and possibly other bases), ammonia, amino acids, and polar hydrocarbons were prepared from the Murchison meteorite for isotopic analyses. The… Expand
Amino Acid Analyses of the Murchison, Murray, and Allende Carbonaceous Chondrites
Three carbonaceous chondrites were examined for water-extractable amino acids. The Murchison Murray specimens were found to be of similar amino acid composition. This similarity suggests that these… Expand
Linear and cyclic aliphatic carboxamides of the Murchison meteorite: hydrolyzable derivatives of amino acids and other carboxylic acids.
Analyses of fractionated aqueous extracts of the Murchison meteorite by gas chromatography-mass spectrometry after silylation with N-methyl-N (tert-butyldimethylsilyl) trifluoroacetamide have… Expand
Isotopic analyses of amino acids from the Murchison meteorite.
- S. Pizzarello, R. Krishnamurthy, S. Epstein, J. Cronin
- Chemistry, Medicine
- Geochimica et cosmochimica acta
- 1 March 1991
Previous isotopic analyses of the total amino acids of the Murchison meteorite showed these compounds to be substantially enriched in 2H, 13C, and 15N relative to terrestrial organic matter. These… Expand
Amino Acid Enantiomer Excesses in Meteorites: Origin and Significance
- J. Cronin, S. Pizzarello
- Chemistry
- 1999
Abstract The presence of small l -excesses in both of the two enantiomeric pairs of 2-amino-2,3-dimethylpentanoic acid, in 2-amino-2-methylbutanoic acid (Isovaline), and in 2-amino-2-methylpentanoic… Expand
Non-racemic amino acids in the Murray and Murchison meteorites.
- S. Pizzarello, J. Cronin
- Chemistry, Medicine
- Geochimica et cosmochimica acta
- 2000
Small (1.0-9.2%) L-enantiomer excesses were found in six alpha-methyl-alpha-amino alkanoic acids from the Murchison (2.8-9.2%) and Murray (1.0-6.0%) carbonaceous chondrites by gas chromatography-mass… Expand