Document Detail

Chiral interactions of histidine in a hydrated vermiculite clay.
MedLine Citation:
PMID:  21031173     Owner:  NLM     Status:  In-Process    
Recent work shows a correlation between chiral asymmetry in non-terrestrial amino acids extracted from the Murchison meteorite and the presence of hydrous mineral phases in the meteorite [D. P. Glavin and J. P. Dworkin, Proc. Natl. Acad. Sci. U. S. A., 2009, 106, 5487-5492]. This highlights the need for sensitive experimental tests of the interactions of amino acids with clay minerals together with high level computational work. We present here the results of in situ neutron scattering experiments designed to follow amino acid adsorption on an exchanged, 1-dimensionally ordered n-propyl ammonium vermiculite clay. The vermiculite gel has a (001) d-spacing of order 5 nm at the temperature and concentration of the experiments and the d-spacing responds sensitively to changes in concentration, temperature and electronic environment. The data show that isothermal addition of D-histidine or L-histidine solutions of the same concentration leads to an anti-osmotic swelling, and shifts in the d-spacing that are different for each enantiomer. This chiral specificity, measured in situ, in real time in the neutron beam, is of interest for the question of whether clays could have played an important role in the origin of biohomochirality.
Donald G Fraser; H Christopher Greenwell; Neal T Skipper; Martin V Smalley; Michael A Wilkinson; Bruno Demé; R K Heenan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-28
Journal Detail:
Title:  Physical chemistry chemical physics : PCCP     Volume:  13     ISSN:  1463-9084     ISO Abbreviation:  Phys Chem Chem Phys     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888160     Medline TA:  Phys Chem Chem Phys     Country:  England    
Other Details:
Languages:  eng     Pagination:  825-30     Citation Subset:  IM    
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK.
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