Experiments on the Abiotic Amplification of Optical Activity

Details Experiments on the Abiotic Amplification of Optical Activity Experiments on the Abiotic Amplification of Optical Activity

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981orli...11..119b&link_type=abstract

Origins of Life, Volume 11, Issue 1-2, pp. 119-134

Physics

12

Scientific paper

Our earlier experiments are briefly reviewed, involving the abiotic generation of optical activity by exposure of DL-amino acids to various “chiral” physical forces. The enantiomeric enrichments so obtained were low, however, and additional experiments were undertaken with the objective of abiotically enhancing such small enantiomeric excesses. D≠L Mixtures of leucine N-carboxy anhydride gave enantiomerically enriched polymers on partial polymerization, while valine NCA mixtures behaved oppositely. Leucine polymers were also found to hydrolyze stereoselectively, providing for additional enantiomenic enhancement. A repetitive sequence of partial polymerization-hydrolysis steps is suggested as a possible mechanism for the abiotic genesis of optically enriched polypeptides on the primitive Earth.

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