Insights into the behaviour of biomolecules on the early Earth: The concentration of aspartate by layered double hydroxide minerals
Insights into the behaviour of biomolecules on the early Earth: The concentration of aspartate by layered double hydroxide minerals
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DOI：
10.1016/j.gca.2015.12.026
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发表时间：
2016-03-01
影响因子：
5
通讯作者：
Fraser, Donald G.
中科院分区：
文献类型：
--
作者：
Gregoire, Brian;Erastova, Valentina;Fraser, Donald G.
矿物表面在Hadean和太古宙期间浓缩和促进简单原始生物分子聚合方面的作用一直是许多研究的主题，以限制可能导致地球早期生命起源的条件。在这里，我们研究了氨基酸天冬氨酸在层状双氢氧化物矿物上的吸附，并使用计算机模拟-实验光谱相结合的方法来深入了解主体-天冬氨酸材料的结构。我们发现，在碱性溶液中，天冬氨酸的吸收是通过双离子形式的天冬氨酸的阴离子交换而发生的，而不是通过表面吸附。阴离子交换只有在pH值时才发生，其中大量天冬氨酸的氨基被去质子化，然后高效地达到矿物质阴离子交换能力。(C)2015爱思唯尔有限公司。保留所有权利。
The role of mineral surfaces in concentrating and facilitating the polymerisation of simple protobiomolecules during the Hadean and Archean has been the subject of much research in order to constrain the conditions that may have led to the origin of life on early Earth. Here we examine the adsorption of the amino acid aspartate on layered double hydroxide minerals, and use a combined computer simulation - experimental spectroscopy approach to gain insight into the resulting structures of the host-aspartate material. We show that the uptake of aspartate occurs in alkaline solution by anion exchange of the dianion form of aspartate, rather than by surface adsorption. Anion exchange only occurs at values of pH where a significant population of aspartate has the amino group deprotonated, and is then highly efficient up to the mineral anion exchange capacity. (C) 2015 Elsevier Ltd. All rights reserved.