Experimental verification of photostability for free- and bound-amino acids exposed to g-rays and UV irradiation

Details Experimental verification of photostability for free- and bound-amino acids exposed to g-rays and UV irradiation Experimental verification of photostability for free- and bound-amino acids exposed to g-rays and UV irradiation

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ep%26s...56..669t&link_type=abstract

Earth, Planets and Space, Volume 56, p. 669-674.

Computer Science

2

Scientific paper

The photo-stability of simulated free and bound amino acids exposed to photon sources of 1.2-1.3 MeV g-rays from a 60°C source and ultra-violet (UV) irradiation from a 10 eV deuterium lamp was examined. The free amino acids in aqueous solution were drastically decreased while the bound amino acids in aqueous solution were slightly decreased with the duration of g-rays and UV irradiation. The apparent half-lives (t1/2) of bound serine and threonine under g-rays irradiation were more than 10.6 and 27.9 times as stable as the free amino acids, respectively. The photo-stability of bound amino acids was greater than that of free amino acids under irradiation by high-energy photons. These results strongly suggest that bound, but not free, amino acids could be found in extraterrestrial environments. Radio- or photo-alteration processes are mainly decomposition pathways, with the production of secondary amino acids via decomposition of the a-carboxylic group; b-alanine and g-aminobutyric acids, a-decarboxylation products of aspartic acid and glutamic acid, respectively, were detected.

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