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Abstract
To find the prebiotic route of homochirality present in amino acids, considering the abiotic evolution of life, surface interaction of L-alanine (L-ala) and D-alanine (D-ala) on Bentonite (BNT) and its divalent metal ion (M=Ca2+, Mg2+, Ni2+, Cu2+ and Zn2+) incorporated BNT has been carried out.Further, absolute value of metal ion affinities with ala (ala—M2+) and hydration effect on the relative stability and geometry of the individual species of ala— M2+×(H2O)n, (n =2 and 4) has also been evaluated using DFT calculation. Interestingly Mg2+ exchanged BNT have shown the selective adsorption of L-ala in comparison to the D-ala at pH 4.0±0.1. These results can help us to understand chemical evolution of life and design our future experiments for the in-depth evaluation of origin of life in Earth and possibility of bio-markers in other planets like Mars.
