LINK<\/strong><\/a><\/p>\n\n\n\n“The abundances, distributions, enantiomeric ratios, and carbon isotopic compositions of amino acids in two fragments of the Aguas Zarcas CM2 type carbonaceous chondrite fall and a fragment of the CM2 Murchison meteorite were determined via liquid chromatography time\u2010of\u2010flight mass spectrometry and gas chromatography isotope ratio mass spectrometry. A suite of two\u2010 to six\u2010carbon aliphatic primary amino acids was identified in the Aguas Zarcas and Murchison meteorites with abundances ranging from ~0.1 to 158 nmol\/g. The high relative abundances of \u03b1\u2010amino acids found in these meteorites are consistent with a Strecker\u2010cyanohydrin synthesis on these meteorite parent bodies. Amino acid enantiomeric and carbon isotopic measurements in both fragments of the Aguas Zarcas meteorites indicate that both samples experienced some terrestrial protein amino acid contamination after their fall to Earth. In contrast, similar measurements of alanine in Murchison revealed that this common protein amino acid was both racemic (D \u2248 L) and heavily enriched in 13C, indicating no measurable terrestrial alanine contamination of this meteorite. Carbon isotope measurements of two rare non\u2010proteinogenic amino acids in the Aguas Zarcas and Murchison meteorites, \u03b1\u2010aminoisobutyric acid and D\u2010 and L\u2010isovaline, also fall well outside the typical terrestrial range, confirming they are extraterrestrial in origin. The detections of non\u2010terrestrial L\u2010isovaline excesses of ~10\u201315% in both the Aguas Zarcas and Murchison meteorites, and non\u2010terrestrial L\u2010glutamic acid excesses in Murchison of ~16\u201340% are consistent with preferential enrichment of circularly polarized light generated L\u2010amino acid excesses of conglomerate enantiopure crystals during parent body aqueous alteration and provide evidence of an early solar system formation bias toward L\u2010amino acids prior to the origin of life.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Daniel P. Glavin, Jamie E. Elsila, Hannah L. McLain, Jos\u00e9 C. Aponte, Eric T. Parker, Jason P. Dworkin, Dolores H. Hill, Harold C. Connolly, Dante S. Lauretta Meteoritics & Planetary Science First Published: 25 February…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5001,152,9,18,47],"tags":[4965,1865,250,3273,105,4607,107,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21574"}],"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=21574"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21574\/revisions"}],"predecessor-version":[{"id":21575,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21574\/revisions\/21575"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}