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- W231556082 abstract "tion of 20:80 (vol:vol) methanol:water with 1.5 mg ml -1 of polysorbate 80 solves this dilemma, with the surfactant forming micelles that promote the dissolution of nonpolar molecules [2]. Here, we report on the ability of this surfactant solution to dissolve organic standards spiked on to analogues to the martian soil, and on the tendency of common spacecraft materials to adsorb these standards from solution. Results: Addition of 1.5 mg ml -1 of the surfactant polysorbate 80 to a 20:80 (vol:vol) methanol:water solution results in an increase in solubility of approximately two orders of magnitude for the standards hexadecane, phytane, squalene, anthracene, pyrene, stigmasterol and coprostane, resulting in solubilities in the range of ~1-50 µg ml -1 . Tests on a range of martian analogues, including the palagonitic tephra JSC Mars-1 [3], goethite and haematite, demonstrates its ability to extract organic compounds spiked on to their surfaces without debilitating adsorption. The addition of iron compounds such as iron (III) sulphate, iron (III) perchlorate and iron (III) chloride to JSC Mars-1 similarly has no significant deleterious adsorption or chemical effects. However, the addition of the clay-rich Jurassic Blue Lias shale to JSC Mars-1 results in significant adsorption of the standards and a greatly reduced efficiency of extraction of the standards. Further testing is required to determine whether this applies to clay minerals in martian environments." @default.
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- W231556082 date "2011-09-01" @default.
- W231556082 modified "2023-09-24" @default.
- W231556082 title "THE LIFE MARKER CHIP - EXTRACTING POLAR AND NONPOLAR BIOMARKERS FROM THE MARTIAN SOIL USING A SURFACTANT-BASED SOLVENT" @default.
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