Unexpected Differences between D- and L- Tyrosine Lead to Chiral Enhancement in Racemic Mixtures. Dedicated to the memory of Prof. Shneior Lifson - A great liberal thinker.

Details Unexpected Differences between D- and L- Tyrosine Lead to Chiral Enhancement in Racemic Mixtures. Dedicated to the memory of Prof. Shneior Lifson - A great liberal thinker. Unexpected Differences between D- and L- Tyrosine Lead to Chiral Enhancement in Racemic Mixtures. Dedicated to the memory of Prof. Shneior Lifson - A great liberal thinker.

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002oleb...32..285s&link_type=abstract

Origins of Life and Evolution of the Biosphere, v. 32, Issue 4, p. 285-297 (2002).

Mathematics

Logic

12

Chiral Selection, Crystallization, Enantiomeric Discrimination, Origin Of Life

Scientific paper

We report here an unexpected difference in the solubilities of D- and L-tyrosine in water, which could be discerned by their rate of crystallization and the resulting concentrations of their saturated solutions. A supersaturated solution of 10 mM L-tyrosine at 20 °C crystallized much more slowly than that of D-tyrosine under the same conditions, and the saturated solution of L-tyrosine was more concentrated than that of D-tyrosine. Supersaturated solutions of 10 mM DL-tyrosine in water formed precipitates of predominantly D-tyrosine and DL-tyrosine, resulting in an excess of L-tyrosine in the saturated solution. The experimental setups were monitored independently by UV-absorption, radioactivity tracing, optical rotation and X-ray diffraction. The process of nucleation and crystallization of D- and L-tyrosine is characterized by an exceptionally high cooperativity. It is possible that minute energy differences between D- and L-tyrosine, originating from parity violation or other non-conservative chiral discriminatory rules, could account for the observations. The physical process that initiated chiral selection in biological systems remains a challenging problem in understanding the origin of life, and it is possible that chiral compounds were concentrated from supersaturated racemic mixtures by preferential crystallization.

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