Document Detail


UVolution, a photochemistry experiment in low earth orbit: investigation of the photostability of carboxylic acids exposed to mars surface UV radiation conditions.
MedLine Citation:
PMID:  20528199     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The detection and identification of organic molecules on Mars are of prime importance to establish the existence of a possible ancient prebiotic chemistry or even a biological activity. To date, however, no complex organic compounds have been detected on Mars. The harsh environmental conditions at the surface of Mars are commonly advocated to explain this nondetection, but few studies have been implemented to test this hypothesis. To investigate the nature, abundance, and stability of organic molecules that could survive under such environmental conditions, we exposed, in low Earth orbit, organic molecules of martian astrobiological relevance to solar UV radiation (>200 nm). The experiment, called UVolution, was flown on board the Biopan ESA module, which was situated outside a Russian Foton automated capsule and exposed to space conditions for 12 days in September 2007. The targeted organic molecules [alpha-aminoisobutyric acid (AIB), mellitic acid, phthalic acid, and trimesic acid] were exposed with, and without, an analogous martian soil. Here, we present experimental results of the impact of solar UV radiation on the targeted molecules. Our results show that none of the organic molecules studied seemed to be radiotolerant to the solar UV radiation when directly exposed to it. Moreover, the presence of a mineral matrix seemed to increase the photodestruction rate. AIB, mellitic acid, phthalic acid, and trimesic acid should not be considered as primary targets for in situ molecular analyses during future surface missions if samples are only collected from the first centimeters of the top surface layer.
Authors:
Fabien Stalport; Yuan Yong Guan; Patrice Coll; Cyril Szopa; Frédérique Macari; François Raulin; Didier Chaput; Hervé Cottin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Astrobiology     Volume:  10     ISSN:  1557-8070     ISO Abbreviation:  Astrobiology     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-06-09     Completed Date:  2010-09-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088083     Medline TA:  Astrobiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  449-61     Citation Subset:  IM    
Affiliation:
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Universities of Paris 7 and Paris 12, Créteil, France. Fabien.Stalport@lisa.univ-paris12.fr
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MeSH Terms
Descriptor/Qualifier:
Aminoisobutyric Acids / chemistry
Benzoates / chemistry
Carboxylic Acids / chemistry*
Earth (Planet)*
Extraterrestrial Environment*
Half-Life
Mars*
Photochemistry / methods*
Phthalic Acids / chemistry
Spectrophotometry, Infrared
Spectrophotometry, Ultraviolet
Surface Properties / radiation effects
Tricarboxylic Acids / chemistry
Ultraviolet Rays*
Chemical
Reg. No./Substance:
0/Aminoisobutyric Acids; 0/Benzoates; 0/Carboxylic Acids; 0/Phthalic Acids; 0/Tricarboxylic Acids; 517-60-2/mellitic acid; 554-95-0/trimesic acid; 62-57-7/2-aminoisobutyric acid; 88-99-3/phthalic acid

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


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