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oai:uvadoc.uva.es:10324/463042021-10-15T08:05:05Zcom_10324_1158com_10324_931com_10324_894col_10324_1242

Carrizo, Daniel Muñoz Iglesias, Victoria Fernández Sampedro, María Teresa Gil Lozano, Carolina Sánchez García, Laura Prieto Ballesteros, Olga Medina García, Jesús Rull Pérez, Fernando 2021-04-20T16:38:28Z 2021-04-20T16:38:28Z 2020 Astrobiology, Marzo 2020, Vol. 20, n. 3. p. 405-414. 1531-1074 http://uvadoc.uva.es/handle/10324/46304 10.1089/ast.2019.2100 405 3 414 Astrobiology 20 1557-8070 The aim of the European Space Agency’s ExoMars rover mission is to search for potential traces of present or past life in the swallow subsurface (2m depth) of Mars. The ExoMars rover mission relies on a suite of analytical instruments envisioned to identify organic compounds with biological value (biomarkers) associated with a mineralogical matrix in a highly oxidative environment. We investigated the feasibility of detecting basic organics (linear and branched lipid molecules) with Raman laser spectroscopy, an instrument onboard the ExoMars rover, when exposed to oxidant conditions. We compared the detectability of six lipid molecules (alkanes, alkanols, fatty acid, and isoprenoid) before and after an oxidation treatment (15 days with hydrogen peroxide), with and without mineral matrix support (amorphous silica rich vs. iron rich). Raman and infrared spectrometry was combined with gas chromatography–mass spectrometry to determine detection limits and technical constraints. We observed different spectral responses to degradation depending on the lipid molecule and mineral substrate, with the silica-rich material showing better preservation of organic signals. These findings will contribute to the interpretation of Raman laser spectroscopy results on cores from the ExoMars rover landing site, the hydrated silica-enriched delta fan on Cogoon Vallis (Oxia Planum). Proyecto MINECO Retos de la Sociedad. Ref. ESP2017-87690-C3-1-R application/pdf eng Mary Ann Liebert, Inc. info:eu-repo/semantics/openAccess Lipid biomarkers—Raman laser spectrometer—Mars exploration—ExoMars 2020 Detection of Potential Lipid Biomarkers in Oxidative Environments by Raman Spectroscopy and Implications for the ExoMars 2020-Raman Laser Spectrometer Instrument Performance info:eu-repo/semantics/article info:eu-repo/semantics/draft SI