LINK<\/strong><\/a><\/p>\n“Compound\u2010specific carbon isotope analysis (\u03b413C) of meteoritic organic compounds can be used to elucidate the abiotic chemical reactions involved in their synthesis. The soluble organic content of the Murchison carbonaceous chondrite has been extensively investigated over the years, with a focus on the origins of amino acids and the potential role of Strecker\u2010cyanohydrin synthesis in the early solar system. Previous \u03b413C investigations have targeted \u03b1\u2010amino acid and \u03b1\u2010hydroxy acid Strecker products and reactant HCN; however, \u03b413C values for meteoritic aldehydes and ketones (Strecker precursors) have not yet been reported. As such, the distribution of aldehydes and ketones in the cosmos and their role in prebiotic reactions have not been fully investigated. Here, we have applied an optimized O\u2010(2,3,4,5,6\u2010pentafluorobenzyl)hydroxylamine (PFBHA) derivatization procedure to the extraction, identification, and \u03b413C analysis of carbonyl compounds in the Murchison meteorite. A suite of aldehydes and ketones, dominated by acetaldehyde, propionaldehyde, and acetone, were detected in the sample. \u03b413C values, ranging from \u221210.0\u2030 to +66.4\u2030, were more 13C\u2010depleted than would be expected for aldehydes and ketones derived from the interstellar medium, based on interstellar 12C\/13C ratios. These relatively 13C\u2010depleted values suggest that chemical processes taking place in asteroid parent bodies (e.g., oxidation of the IOM) may provide a secondary source of aldehydes and ketones in the solar system. Comparisons between \u03b413C compositions of meteoritic aldehydes and ketones and other organic compound classes were used to evaluate potential structural relationships and associated reactions, including Strecker synthesis and alteration\u2010driven chemical pathways. “<\/p>\n","protected":false},"excerpt":{"rendered":"
Danielle N. Simkus, Jos\u00e9 C. Aponte, Robert W. Hilts, Jamie E. Elsila, Christopher D. K. Herd Meteoritics & Planetary Science First published: 14 October 2018 LINK “Compound\u2010specific carbon isotope analysis (\u03b413C) of meteoritic organic compounds…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[152,9,18],"tags":[2437,1865,3273,105,2438,107],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16675"}],"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=16675"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16675\/revisions"}],"predecessor-version":[{"id":16676,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/16675\/revisions\/16676"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}