LINK<\/strong><\/a><\/p>\n\n\n\n“Meteorites contain prebiotic, bio-relevant organic compounds including amino acids. Their syntheses could result from diverse sources and mechanisms and provide a window on the conditions and materials present in the early solar system. Here we constrain alanine\u2019s synthetic history in the Murchison meteorite using site-specific 13C\/12C measurements, reported relative to the VPDB standard. The \u03b413CVPDB values of \u201329 \u00b1 10 \u2030, 142 \u00b1 20 \u2030, and \u201336 \u00b1 20 \u2030 for the carboxyl, amine-bound, and methyl carbons, respectively, are consistent with Strecker synthesis of interstellar-medium-derived aldehydes, ammonia, and low-\u03b413C nebular or interstellar-medium-derived CN. We report experimentally measured isotope effects associated with Strecker synthesis, and use them to constrain the \u03b413C values of the alanine precursors, which we then use to construct a model that predicts the molecular-average \u03b413C values of 19 other organic compounds of prebiotic significance found in Murchison if they were made by our proposed synthetic network. Most of these predictions agree with previous measurements, suggesting that interstellar-medium-derived aldehydes and nebular and\/or pre-solar CN could have served as substrates for synthesis of a wide range of prebiotic compounds in the early solar system.”<\/p>\n","protected":false},"excerpt":{"rendered":"
L. Chimiak, J.E. Elsila, B. Dallas, J.P. Dworkin, J.C. Aponte, A.L. Sessions, J.M. Eiler Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 29 September 2020 LINK “Meteorites contain prebiotic, bio-relevant organic compounds including amino…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,18,72,576,71],"tags":[1865,250,105,3701,107,232,5732],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/23941"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23941"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/23941\/revisions"}],"predecessor-version":[{"id":23942,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/23941\/revisions\/23942"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}