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Abstract
Abstract Critical experimental data are presented on the competitive adsorption of metal cations with different ionic valences to phospholipid vesicles, and on the binding of hydrophobic ions from mixed solutions with multivalent metal cations produced under different conditions by means of the Inductively Coupled Argon Plasma. It is apparent that the preferential effect in binding between the metal cations depends not only on their ionic valences but also on the concentrations of each ion at which the corresponding binding is carried out; i.e., the binding strength of the metal cations on the membrane surface increases in the following order: K+<Mg2+<Ca2+<La3+<Th4+, and this order comes to be more pronounced in the high-concentration region of each component. Furthermore, it is realized that, in binding from mixed solutions of hydrophobic ions and multivalent metal cations (Ca2+ or Th4+), a synergistic interaction between these ions occurs; i.e., the binding of hydrophobic anions is promoted by the presence of metal cations, while the binding of hydrophobic cations is hindered by the metal cations.
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