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• W2893596112 abstract "The origin of fatty acids on the prebiotic Earth is important as they likely formed the encapsulating membranes of the first protocells. Carbon-rich meteorites (i.e., carbonaceous chondrites) such as Murchison and Tagish Lake are well known to contain these molecules, and their delivery to the early planet by intense early meteorite bombardments constitutes a key prebiotic source. We collect the fatty acid abundances measured in various carbonaceous chondrites from the literature and analyze them for patterns and correlations. Fatty acids in meteorites include straight-chain and branched-chain monocarboxylic and dicarboxylic acids up to 12 carbons in length—fatty acids with at least 8 carbons are required to form vesicles, and modern cell membranes employ lipids with ∼ 12–20 carbons. To understand the origin of meteoritic fatty acids, we search the literature for abiotic fatty acid reaction pathways and create a candidate list of 11 reactions that could potentially produce these fatty acids in meteorite parent bodies. Straight-chain monocarboxylic acids (SCMA) are the dominant fatty acids in meteorites, followed by branched-chain monocarboxylic acids (BCMA). SCMA are most abundant in CM2 and Tagish Lake (ungrouped) meteorites, ranging on average from 102 ppb to 4 × 105 ppb, and 104 ppb to 5 × 106 ppb, respectively. In CM, CV, and Tagish Lake meteorites, SCMA abundances generally decrease with increasing carbon chain length. Conversely, SCMA abundances in CR meteorites peak at 5 and 6 carbons in length, and decrease on either side of this peak. This unique CR fatty acid distribution may hint at terrestrial contamination, or that certain fatty acid reactions mechanisms are active in different meteorite parent bodies (planetesimals). We identify Fischer-Tropsch-type synthesis as the most promising pathway for further analysis in the production of fatty acids in planetesimals." @default.
• W2893596112 created "2018-10-05" @default.
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• W2893596112 date "2019-02-01" @default.
• W2893596112 modified "2023-10-06" @default.
• W2893596112 title "Meteoritic abundances of fatty acids and potential reaction pathways in planetesimals" @default.
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• W2893596112 doi "https://doi.org/10.1016/j.icarus.2018.09.028" @default.
• W2893596112 hasPublicationYear "2019" @default.
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