Molecular Recognition by Artificial Hosts with Membrane Potential Changes

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  • 人工ホストによる膜電位変化を伴う分子認識
  • ジンコウ ホスト ニ ヨル マク デンイ ヘンカ オ トモナウ ブンシ ニンシ

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Abstract

Studies on new aspects of host-guest molecular recognition, which leads to membrane potential changes, are described. Special focus was placed on potential changes induced by host-guest complexation with organic guests at the surface of liquid membranes. The following modes of potentiometric discrimination of organic guests are described. (i) Potentiometric discrimination of organic anions by macrocyclic polyamines, based on electrostatic interactions between protonated polyamine hosts and anionic guests. (ii) Potentiometric discrimination of nucleotides bearing guanine and adenine bases by the hosts having a cytosine residue, based on complementary base pairing in addition to electrostatic interactions. (iii) Potentiometric discrimination of amines by a calix [6] arene hexaester or a β-cyclodextrin derivative, based on recognition of the steric structures of nonpolar moieties of these guests by inclusion into well-defined cavities of host molecules. Some characteristic aspects of host-guest molecular recognition at membrane surfaces are discussed in comparison with those in homogeneous solutions.

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