L Amino acids and D-glucose bind stereospecifically to a colloidal clay

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Science  23 Mar 1979:
Vol. 203, Issue 4386, pp. 1243-1244
DOI: 10.1126/science.424749


L-Leucine, L-aspartate, and D-glucose bind in a stereospecific manner to a colloidal clay, bentonite. This binding has high-affinity, saturable characteristics. The biologically uncommon enantiomers, D-leucine, D-asparatate, and L-glucose, do not exhibit any selective absorption on bentonite. It is suggested that this difference between stereoisomers could account for the evolution of life forms possessing a great preponderance of L amino acids and D-glucose.