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Insights into the behaviour of biomolecules on the early Earth : the concentration of aspartate by layered double hydroxide minerals.

Grégoire, Brian and Erastova, Valentina and Geatches, Dawn L. and Clark, Stewart J. and Greenwell, H. Christopher and Fraser, Donald G. (2016) 'Insights into the behaviour of biomolecules on the early Earth : the concentration of aspartate by layered double hydroxide minerals.', Geochimica et cosmochimica acta., 176 . pp. 239-258.

Abstract

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.gca.2015.12.026
Publisher statement:© 2015 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:22 December 2015
Date deposited:24 February 2017
Date of first online publication:28 December 2015
Date first made open access:No date available

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