Monte Carlo simulation of molecular dynamics for amino acid production from carboxylic acid via C-14 beta-decay.

To study the chemical origin of life, we investigated the amino acid production probability from radiocarbon (C-14)-containing carboxylic acid via beta-decay using a newly developed Monte Carlo simulator for molecular dynamics calculation. Using the simulation, we calculated the dynamical trajectory of N-14 recoiled via C-14 beta-decay in [3-C-14]propionic acid and evaluated the staying probability of N-14 in the compound, which is the glycinium (a protonated glycine) production probability from [3-C-14]propionic acid. The glycinium production probability was calculated to be 78.7% assuming static compound structures of [3-C-14]propionic acid and a glycinium C-N binding potential energy of 3.93 eV. From calculations with various binding potential parameters, a glycinium production probability of approximately 30% was expected by simulation in case of a loose C-N binding potential energy of 2-eV.