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Amino acids in carbonaceous chondrites.

J G Lawless, E Peterson

    Origins of Life
    |January 1, 1975
    PubMed
    Summary

    Extraterrestrial amino acids found in meteorites provide evidence for chemical evolution. Sophisticated analysis reveals diverse amino acids, supporting natural synthesis beyond Earth.

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    Area of Science:

    • Astrochemistry
    • Organic Geochemistry
    • Cosmochemistry

    Background:

    • Laboratory experiments have long explored chemical evolution and amino acid formation.
    • A lack of concrete natural evidence has historically hindered the chemical evolution hypothesis.
    • Recent advancements in analytical techniques and meteorite sample availability are crucial.

    Purpose of the Study:

    • To provide concrete natural evidence for the chemical evolution hypothesis.
    • To identify and characterize extraterrestrial amino acids in meteorites.
    • To investigate the origins of these extraterrestrial organic molecules.

    Main Methods:

    • Analysis of carbonaceous chondrites (Murchison, Murray, Orgueil) using sophisticated techniques.
    • Identification and quantification of protein and nonprotein amino acids.
    • Deuterium incorporation studies using D2O extraction from meteorite samples.

    Main Results:

    • Identification of at least 35 diverse amino acids in Murchison and Murray meteorites.
    • Amino acid concentrations show a trend of decreasing abundance with increasing carbon number.
    • Deuterium incorporation in some Murchison meteorite amino acids suggests precursor molecules or hydrogen-deuterium exchange.

    Conclusions:

    • Meteoritic amino acids provide strong evidence for natural extraterrestrial chemical synthesis.
    • The diversity and abundance of amino acids support theories of chemical evolution.
    • Further research is needed to understand the mechanisms of deuterium incorporation and precursor molecules.

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