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Extraterrestrial Amino Acids in Ureilites Including Almahata SittaUreilites are a class of meteorites that lack chondrules (achondrites) but have relatively high carbon abundances, averaging approx.3 wt %. Using highly sensitive liquid chromatography coupled with UV fluorescence and time-of-flight mass spectrometry (LC-FD/ToF-MS), it was recently determined that there are amino acids in. fragment 94 of the Almahata Sitta ureilite[l]. Based on the presence of amino acids that are rare in the Earth's biosphere, as well as the near-racemic enantiomeric ratios of marry of the more common amino acids, it was concluded that most of the detected amino acids were indigenous to the meteorite. Although the composition of the Almahata Sitta ureilite appears to be unlike other recovered ureilites, the discovery of amino acids in this meteorite raises the question of whether other ureilites rnav also contain amino acids. Herein we present the results of LC-FDlTo.F-MS analyses of: a sand sample from the Almahata Sitta strewn held, Almahata Sitta fragments 425 (an ordinary H5 chondrite) and 427 (ureilite), as well as an Antarctic ureilite (Allan lulls, ALHA 77257).
Document ID
20110008083
Acquisition Source
Goddard Space Flight Center
Document Type
Other
Authors
Burton, A. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Glavin, D. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Callahan, M. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dworkin, J. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Space Sciences (General)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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