论文标题
星际培养基中甘氨酸形成的非能力机制
A non-energetic mechanism for glycine formation in the interstellar medium
论文作者
论文摘要
Rosetta Mission在67p/Churyumov-Gerasimenko上检测氨基酸甘氨酸及其胺前体甲胺，为地球上益生元的宇宙起源提供了有力的证据。在恒星和行星形成过程中，这种复杂的有机分子的形成方式和何时仍在争论中。我们报告了在冷致密的星际云条件下，通过原子和激进的 - 自由基添加表面反应在固相中形成的甘氨酸的第一个实验室检测。我们的实验在星体化学模型的支持下表明，在星际水富的冰中，甘氨酸形成不需要能量辐射，例如紫外光子和宇宙射线，在该冰中保留了比以前更早的星形形成阶段。我们还确认固体甲胺是重要的副反应产物。冰粒上的甘氨酸的prestell形成为富含行星形成材料化学含量的空间中的复杂且普遍存在的益生元化学反应提供了基础。
The detection of the amino acid glycine and its amine precursor methylamine on the comet 67P/Churyumov-Gerasimenko by the Rosetta mission provides strong evidence for a cosmic origin of prebiotics on Earth. How and when such complex organic molecules form along the process of star- and planet-formation remains debated. We report the first laboratory detection of glycine formed in the solid phase through atom and radical-radical addition surface reactions under cold dense interstellar cloud conditions. Our experiments, supported by astrochemical models, suggest that glycine forms without the need for energetic irradiation, such as UV photons and cosmic rays, in interstellar water-rich ices, where it remains preserved, in a much earlier star-formation stage than previously assumed. We also confirm that solid methylamine is an important side-reaction product. A prestellar formation of glycine on ice grains provides the basis for a complex and ubiquitous prebiotic chemistry in space enriching the chemical content of planet-forming material.
