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Isotopic analyses of amino acids from the Murchison meteorite

Pizzarello, S. and Krishnamurthy, R. V. and Epstein, S. and Cronin, J. R. (1991) Isotopic analyses of amino acids from the Murchison meteorite. Geochimica et Cosmochimica Acta, 55 (3). pp. 905-910. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20131112-100210022

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Abstract

Previous isotopic analyses of the total amino acids of the Murchison meteorite showed these compounds to be substantially enriched in ^2H, ^(13)C, and ^(15)N relative to terrestrial organic matter. These analyses have been repeated (^2H, ^(13)C) with inclusion of an ultrafiltration step to exclude the possibility that a fine paniculate contaminant carried the isotopic excesses observed in the previous work. In addition, the meteorite amino acids were chromatographically separated to rule out the possibility that the isotopic enrichment of the meteorite extract could reside in basic compounds other than amino acids. The results indicate that the Murchison amino acids are truly isotopically unusual, that the isotopic excesses reside in at least several different amino acids, and that the isotopic contents of some of these amino acids reach values of about +40%. (δ^(13)C) and +2500%. (δD). If it is assumed that the high deuterium content of the meteorite ɑ - amino acids is a result of the synthesis of their molecular precursors by low temperature ion-molecule reactions in an interstellar cloud, their formation by aqueous phase Strecker reactions in the parent body is consistent with their general characteristics and with known parent body processes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-7037(91)90350-EDOIArticle
http://www.sciencedirect.com/science/article/pii/001670379190350EPublisherArticle
Additional Information:© 1991 Pergamon Press plc. Received October 19, 1990; accepted in revised form January 28, 1991. We thank E. Olson (Field Museum of Natural History) for providing the Murchison sample and P. R. Buseck for a helpful discussion. We appreciate constructive reviews by J. L. Bada, N. E. Blair, D. J. Des Marais, and J. F. Kerridge and gratefully acknowledge grants in support of this work from the Life Sciences Division of the National Aeronautics and Space Administration (NSG-7255; NAGW-1899). Editorial handling: G. Faure
Funders:
Funding AgencyGrant Number
NASA Life Sciences DivisionNSG-7255
NASA Life Sciences DivisionNAGW-1899
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Center for Meteorite Studies123
Issue or Number:3
Record Number:CaltechAUTHORS:20131112-100210022
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131112-100210022
Official Citation:S. Pizzarello, R.V. Krishnamurthy, S. Epstein, J.R. Cronin, Isotopic analyses of amino acids from the Murchison meteorite, Geochimica et Cosmochimica Acta, Volume 55, Issue 3, March 1991, Pages 905-910, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(91)90350-E. (http://www.sciencedirect.com/science/article/pii/001670379190350E)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42374
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 Nov 2013 18:37
Last Modified:03 Oct 2019 05:57

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