Affinity of Metal Ions Incorporated Bentonite for Enantiomeric Interactions with Alanine

<div> <table> <tr> <td> <p>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=Ca<sup>2+</sup>, Mg<sup>2+</sup>, Ni<sup>2+</sup>, Cu<sup>2+</sup> and Zn<sup>2+</sup>) incorporated BNT has been carried out.Further, absolute value of metal ion affinities with ala (ala—M<sup>2+</sup>) and hydration effect on the relative stability and geometry of the individual species of ala— M<sup>2+</sup>×(H<sub>2</sub>O)n, (n =2 and 4) has also been evaluated using DFT calculation. Interestingly Mg<sup>2+ </sup>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.</p> </td> </tr> </table> </div>