Document Detail


Amino acids from ion-irradiated nitrile-containing ices.
MedLine Citation:
PMID:  18752457     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Solid CH(3)CN and solid H(2)O + CH(3)CN were ion irradiated near 10 K to initiate chemical reactions thought to occur in extraterrestrial ices. The infrared spectra of these samples after irradiation revealed the synthesis of new molecules. After the irradiated ices were warmed to remove volatiles, the resulting residual material was extracted and analyzed. Both unhydrolyzed and acid-hydrolyzed residues were examined by both liquid and gas chromatographic-mass spectral methods and found to contain a rich mixture of products. The unhydrolyzed samples showed HCN, NH(3), acetaldehyde (formed by reaction with background and atmospheric H(2)O), alkyamines, and numerous other compounds, but no amino acids. However, reaction products in hydrolyzed residues contained a suite of amino acids that included some found in carbonaceous chondrite meteorites. Equal amounts of D- and L-enantiomers were found for each chiral amino acid detected. Extensive use was made of (13)C-labeled CH(3)CN to confirm amino acid identifications and discriminate against possible terrestrial contaminants. The results reported here show that ices exposed to cosmic rays can yield products that, after hydrolysis, form a set of primary amino acids equal in richness to those made by other methods, such as photochemistry.
Authors:
Reggie L Hudson; Marla H Moore; Jason P Dworkin; Mildred P Martin; Zachary D Pozun
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Astrobiology     Volume:  8     ISSN:  1557-8070     ISO Abbreviation:  Astrobiology     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-10-10     Completed Date:  2008-12-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088083     Medline TA:  Astrobiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  771-9     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Eckerd College, St. Petersburg, Florida 33711, USA. hudsonrl@eckerd.ed
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / chemistry*
Exobiology
Extraterrestrial Environment
Gas Chromatography-Mass Spectrometry / methods
Hydrolysis
Ice*
Meteoroids
Models, Chemical
Nitriles / chemistry*
Spectrophotometry, Infrared / methods
Stereoisomerism
Temperature
Water / chemistry
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Ice; 0/Nitriles; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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