Imperial College London
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ProfessorSamuelKounaves

Faculty of Engineering, Department of Earth Science & Engineering

Visiting Professor
 
 
 
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Contact

 

+44 (0)7763 262 356s.kounaves Website CV

 
 
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Location

 

2.34Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Liu:2021:10.1089/ast.2020.2328,
author = {Liu, D and Kounaves, SP},
doi = {10.1089/ast.2020.2328},
journal = {Astrobiology},
pages = {793--801},
title = {Degradation of amino acids on Mars by UV irradiation in the presence of chloride and oxychlorine salts},
url = {http://dx.doi.org/10.1089/ast.2020.2328},
volume = {21},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The degradation of glycine (Gly), proline (Pro), and tryptophan (Trp) was studied under simulated Mars conditions during UV-driven production of oxychlorines and compared under Mars ambient and humid conditions, as films, and with addition of sodium chloride (NaCl), sodium chlorate (NaClO3), and sodium perchlorate (NaClO4) salts. It was shown that glycine sustained no significant destruction in either of the non-salt samples under Mars ambient or humid conditions. However, its degradation increased in the presence of any of the three salts and under both conditions though more under humid conditions. Proline degradation followed the order No Salt > NaCl > NaClO3 > NaClO4 under Mars ambient conditions but the reverse order under Mars humid conditions. A mechanism is proposed to explain how water and silica participate in these degradation reactions and how it is strongly influenced by the identity of the salt and its ability to promote deliquescence. No difference was observed for tryptophan between Mars ambient and humid conditions, or for the different salts, suggesting its degradation mechanism is different compared to glycine and proline. The results reported here will help to better understand the survival of amino acids in the presence of oxychlorines and UV on Mars and thus provide new insights for the detection of organic compounds on future Mars missions.
AU  - Liu,D
AU  - Kounaves,SP
DO  - 10.1089/ast.2020.2328
EP  - 801
PY  - 2021///
SN  - 1531-1074
SP  - 793
TI  - Degradation of amino acids on Mars by UV irradiation in the presence of chloride and oxychlorine salts
T2  - Astrobiology
UR  - http://dx.doi.org/10.1089/ast.2020.2328
UR  - https://www.ncbi.nlm.nih.gov/pubmed/33787313
UR  - http://hdl.handle.net/10044/1/88428
VL  - 21
ER  -
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