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  Chirality of meteoritic free and IOM-derived monocarboxylic acids and implications for prebiotic organic synthesis

Aponte, J. C., Tarozo, R., Alexandre, M. R., Alexander, C. M., Charnley, S. B., Hallmann, C., Summons, R. E., Huang, Y. (2014): Chirality of meteoritic free and IOM-derived monocarboxylic acids and implications for prebiotic organic synthesis. - Geochimica et Cosmochimica Acta, 131, 1-12.
https://doi.org/10.1016/j.gca.2014.01.035

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Aponte, José C.1, Autor
Tarozo, Rafael1, Autor
Alexandre, Marcelo R.1, Autor
Alexander, Conel M.O’D.1, Autor
Charnley, Steven B.1, Autor
Hallmann, Christian2, Autor              
Summons, Roger E.1, Autor
Huang, Yongsong1, Autor
Affiliations:
1External Organizations, ou_persistent22              
20 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              

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 Zusammenfassung: The origin of homochirality and its role in the development of life on Earth are among the most intriguing questions in science. It has been suggested that carbonaceous chondrites seeded primitive Earth with the initial organic compounds necessary for the origin of life. One of the strongest pieces of evidence supporting this theory is that certain amino acids in carbonaceous chondrites display a significant L-enantiomeric excess (ee), similar to those use by terrestrial. Analyses of ee in meteoritic molecules other than amino acids would shed more light on the origins of homochirality. In this study we investigated the stereochemistry of two groups of compounds: 1) free monocarboxylic acids (MCAs) from CM2 meteorites LON 94101 and Murchison; and 2) the aliphatic side chains present in the insoluble organic matter (IOM) and extracted in the form of monocarboxylic acids (MCAs) from EET 87770 (CR2) and Orgueil (CI1). Contrary to the well-known ee observed for amino acids in meteorites, we found that meteoritic branched free and IOM-derived MCAs with 5–8 carbon atoms are essentially racemic. The racemic nature of these compounds is used to discuss the possible influence of ultraviolet circularly polarized light (UVCPL) and aqueous alterations on the parent body on chirality observed in in carbonaceous chondrites.

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 Datum: 2014
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1016/j.gca.2014.01.035
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Titel: Geochimica et Cosmochimica Acta
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 131 Artikelnummer: - Start- / Endseite: 1 - 12 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals161
Publisher: Elsevier