Carbon isotope evidence for the substrates and mechanisms of prebiotic synthesis in the early solar system

Carbon isotope evidence for the substrates and mechanisms of prebiotic synthesis in the early solar system
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早期太阳系中生命起源前合成的底物和机制的碳同位素证据

DOI:
10.1016/j.gca.2020.09.026
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发表时间:
2021
影响因子:
5
通讯作者:
Eiler, J.M.
Eiler, J.M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Chimiak, L.;Elsila, J.E.;Dallas, B.;Dworkin, J.P.;Aponte, J.C.;Sessions, A.L.;Eiler, J.M.

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陨石含有益生元,生物相关的有机化合物,包括氨基酸。它们的合成可能来自不同的来源和机制,并为早期太阳系的条件和物质提供了一个窗口。在这里,我们使用特定地点的13c /12C测量值来约束Murchison陨石中丙氨酸的合成历史,报告相对于VPDB标准。羧基碳、胺结合碳和甲基碳的δ 13cvpdb值分别为- 29 ± 10‰、142 ± 20‰和- 36 ± 20‰,与星际介质衍生醛、氨和低δ 13c星云或星际介质衍生CN的Strecker合成相一致。我们报告了实验测量的与Strecker合成相关的同位素效应,并使用它们来约束丙氨酸前体的δ13C值,然后我们用它来构建一个模型,预测在Murchison发现的其他19种具有益生元意义的有机化合物的分子平均δ13C值,如果它们是由我们提出的合成网络制造的。这些预测大多与先前的测量结果一致,表明星际介质衍生的醛和星云和/或前太阳CN可能在早期太阳系中作为合成广泛的益生元化合物的底物。
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’s synthetic history in the Murchison meteorite using site-specific13C/12C measurements, reported relative to the VPDB standard. The δ13CVPDBvalues of −29 ± 10‰, 142 ± 20‰, and −36 ± 20‰ for the carboxyl, amine-bound, and methyl carbons, respectively, are consistent with Strecker synthesis of interstellar-medium-derived aldehydes, ammonia, and low-δ13C nebular or interstellar-medium-derived CN. We report experimentally measured isotope effects associated with Strecker synthesis, and use them to constrain the δ13C values of the alanine precursors, which we then use to construct a model that predicts the molecular-average δ13C 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.
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发表时间: 2017-03-01
影响因子: 3.4
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期刊:
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