Stability of alanine in a high radiation field, adsorbed onto solid surfaces

Aguilar-Ovando, E.; Negrón‐Mendoza, A.

doi:10.1007/s10967-014-3735-4

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…Bernal's hypothesis has gained strength over the years. First, clay minerals are widely distributed, have been historically prevalent along the whole timeline of geological and biological events on Earth, and have affinity for organic molecules (Aguilar-Ovando and Negrón-Mendoza, 2015;Carneiro et al, 2011;Georgelin et al, 2015;Kalra et al, 2000;Pedreira-Segade et al, 2016;Ponnamperuma et al, 1982). Second, amino acids polymerization has been observed experimentally in the presence of clay minerals starting in the 1970's, (Bujdák et al, 1994;Jaber et al, 2014;Lahav et al, 1978;Paecht-Horowitz et al, 1970).…”

Section: Introductionmentioning

confidence: 99%

A comparative study of alanine adsorption and condensation to peptides in two clay minerals

Silva

Lima

Silva-Filho

et al. 2020

Applied Clay Science

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The polycondensation of amino acids to oligopeptides is an important step in the origins of life, and known to be effective on several mineral surfaces. The data available on clay mineral surfaces are heterogeneous and sometimes contradictory, however. The objective of the present work is to investigate the adsorption of a selected amino acid, alanine, in expanding and non-expanding clays and then study the possible peptide condensation by thermal activation. A multi-technique approach was used, including macroscopic measurements of the adsorption process (adsorption isotherms and pHmetry), and in situ molecular-level characterization of the solids obtained (X-ray diffraction, thermogravimetric analysis and infrared spectroscopy). The results indicate that only weak interaction is established between alanine molecule and kaolinite surfaces, most of the deposited molecules being only physically retained. Thermal activation of alanine/kaolinite only led to desorption. In contrast, higher-energy adsorption mechanisms were at play in hectorite, including cation exchange and coordinative adsorption to the interlayer ions, and alanine species adsorbed in this way were observed to form cyclic dimers upon activation between 160 and 270 °C.

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