Solid-Phase Formation Of Isovaline, A Non-Biological, Meteoritic Amino Acid

Details Solid-Phase Formation Of Isovaline, A Non-Biological, Meteoritic Amino Acid Solid-Phase Formation Of Isovaline, A Non-Biological, Meteoritic Amino Acid

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3803h&link_type=abstract

American Astronomical Society, DPS meeting #39, #38.03; Bulletin of the American Astronomical Society, Vol. 39, p.489

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Among the Murchison (CM) meteoritic amino acids, isovaline stands out as being non-biological (nonprotein) and having a high abundance. Approximately equal amounts of D- and L-isovaline have been reported in CM meteorites, but the molecule's structure appears to prohibit racemization in aqueous solutions. While it is possible that isovaline could be made by the oft-studied Strecker reaction, laboratory experiments have seldom been able to produce this molecule from realistic molecular precursors.
Recently we have investigated the low-temperature solid-phase chemistry of isovaline with an eye toward the molecule's formation, its stability, and the interconversion of its D- and L-enantiomers. Ion-irradiated isovaline-containing ices were examined by IR spectroscopy and highly-sensitive LC/ToF-MS methods to assess both amino acid destruction and racemization. Samples were studied both in the presence and absence of water-ice, and the destruction of isovaline was measured as a function of radiation dose. In addition, we have continued our earlier work on solid-phase amino acid formation, extending it to cover isovaline. In this presentation we will report the results of these newer investigations. This work was supported by a grant to the Goddard Center for Astrobiology through the NASA Astrobiology Institute. AL was supported by an award from the Summer Undergraduate Internship in Astrobiology program.

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