Insights into Abiotically-Generated Amino Acid Enantiomeric Excesses Found in Meteorites
نویسندگان
چکیده
منابع مشابه
Inconclusive evidence for nonterrestrial isoleucine enantiomeric excesses in primitive meteorites.
Pizzarello et al. (1) recently described the soluble organic content of eight Antarctic Renazzo-type (CR) carbonaceous chondrites and reported large enantiomeric excesses (ee) of Lisoleucine and D-alloisoleucine. The reported values of ee decrease with inferred increases in aqueous alteration. We believe the conclusions presented in the paper are not fully justified and the data are potentially...
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Carbonaceous chondrites are meteoritic fragments of asteroids that avoided the geological reprocessing of larger planets and allow laboratory probing of early solar-nebula materials. Among these, Renazzo-type (CR) chondrites found in Antarctica appear remarkably pristine and are distinguished by abundant organic materials and water-soluble molecules such as amino acids and ammonia. We present a...
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The elaboration of an ever increasing number of chiral catalysts or reagents demands fast and sensitive methods to measure enantiomeric excesses of the products. This review discusses the various ways to solve these problems. Mass spectrometry, chromatographic or chiroptical methodologies, fluorescence, liquid crystals, enzymatic methods, and immunoassays, are some of the technologies which may...
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Amino acids in Solar System bodies may have played a key role in the chemistry that led to the origin of life on Earth. We present laboratory studies testing the stability of amino acids against γ radiation photolysis. All the 20 chiral amino acids in the levo form used in the proteins of the current terrestrial biochemistry have been irradiated in the solid state with γ radiation to a dose of ...
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ژورنال
عنوان ژورنال: Life
سال: 2018
ISSN: 2075-1729
DOI: 10.3390/life8020014