THEORY OF ELECTRIC CHARACTERISTICS OF THE LIPID PVC/DOPP MEMBRANE ANDPVC/DOPP MEMBRANE IN RESPONSE TO TASTE STIMULI/

Electric characteristics of two kinds of membranes in response to NaCl and quinine were theoretically studied; one membrane composed of poly vinyl chloride (PVC) and dioctylphenylphosphonate (DOPP), and the othe r a lipid/PVC/DOPP membrane containing PVC, DOPP and a negatively char ged lipid. We develop a theory by taking into account both the surface electric potential and the diffusion potential within the membrane an d succeed in interpreting the observed data. On increasing the NaCl co ncentration, the lipid/PVC/DOPP membrane changes from weakly charged s tate to fully charged state by dissociation of H+ from the lipids. The hydrophobic interaction between quinine and the PVC/DOPP membrane was strong enough to overcome the electric repulsion.