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 meteorites, amino acids occur at a total concentration that may reach 0.6 …

CR chondrites are among the most primitive meteorites. In this paper, we report the first
measurements of amino acids in Antarctic CR meteorites. Three CRs, Elephant Moraine
(EET) 92042, Graves Nunataks (GRA) 95229, and Grosvenor Mountains (GRO) 95577, were …

Abstract Small (1.0–9.2%) l-enantiomer excesses were found in six α-methyl-α-amino
alkanoic acids from the Murchison (2.8–9.2%) and Murray (1.0–6.0%) carbonaceous
chondrites by gas chromatography-mass spectroscopy of their N-trifluoroacetyl or N …

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 acid from the Murchison meteorite has also been observed in these amino  …

The discoveries of amino acids of extraterrestrial origin in many meteorites over the last 50
years have revolutionized the Astrobiology field. A variety of non-terrestrial amino acids
similar to those found in life on Earth have been detected in meteorites. A few amino acids  …

The class of meteorites called carbonaceous chondrites are examples of material from the
solar system which have been relatively unchanged from the time of their initial formation.
These meteorites have been classified according to the temperatures and physical …

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 show that the L enantiomer occurs in excess (7.0 and 9.1 …

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 …

Asteroids and their fragments have impacted the Earth for the last 4.5 Gyr. Carbonaceous
meteorites are known to contain a wealth of indigenous organic molecules, including amino
acids, which suggests that these meteorites could have been an important source of …

A SIGNIFICANT portion of prebiotic organic matter on the early Earth may have been
introduced by carbonaceous asteroids and comets 1. The distribution and stable-isotope
composition of individual organic compounds in carbonaceous meteorites, which are …