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A New Approach in Prebiotic Chemistry Studies: Proline Sorption Triggered by Mineral Surfaces Analysed Using XPS
Eduardo J Cueto-Díaz1, Santos Gálvez-Martínez1, María Colin-García2
1Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir, km. 4, Torrejón de Ardoz, 28850 Madrid, Spain.
Minerals like montmorillonite and olivine can adsorb amino acids, aiding prebiotic chemistry. Proline adsorption varies based on mineral type, offering insights into early life chemical processes.
Area of Science:
- Astrobiology and Geochemistry
- Origin of Life Studies
Background:
- The role of minerals in prebiotic evolution is debated.
- Mineral surfaces may concentrate biomolecules, facilitating polymerization reactions.
Purpose of the Study:
- To spectroscopically characterize the interaction between L-proline and prebiotic minerals.
- To understand the structure-affinity relationship between mineral surfaces and proline.
Main Methods:
- Infrared spectroscopy
- X-ray photoemission spectroscopy (XPS)
- X-ray diffraction (XRD)
Main Results:
- L-proline adsorbed onto montmorillonite, haematite, olivine, and iron disulphide in liquid medium.
- Adsorption form (anionic/zwitterionic) depended on mineral structure and composition.
- Silicates showed higher adsorption than iron oxides.
Conclusions:
- Mineral-proline interactions are influenced by mineralogy and crystal structure.
- Findings contribute to understanding amino acid adsorption on minerals relevant to the origin of life.
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