Photo-excitable Membranes. Ion-Selective Photoresponse of Poly(Vinyl Chloride)/Spirobenzopyran Membranes Doped with Nonactin and Valinomycin

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The magnitude of the photoinduced membrane potential actoss poly(vinyl chloride)/spirobenzopyran membranes doped with nonactin or valinomycin depended considerably upon the kind and the concentration of alkali-metal and NH^+_4 cations in the aqueous solution adjacent to the ultraviolet (UV)-irradiated surface of the membrane. The photoresponse was suppressed with increasing concentration of the cations. The ion-selectivity in the potentiometric photoresponse of the nonactin-entrapped membrane was in the order of NH^+_4>K^+>Rb^+>Cs^+>Na^+>Li^+, whereas the order of selectivity of Rb^+>K^+>Cs^+>NH^+_4>Na^+>Li^+ was ovserved for the valinomycin-doped membrane. The results can be explained in terms of the binding abilities of nonactin and valinomycin for alkali-metal and NH^+_4 cations.
公益社団法人日本薬学会の論文
1989-05-25