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Ion transport across a bilayer lipid membrane in the presence of a hydrophobic ion or an ionophore

疎水性イオンやイオノフォア存在下における脂質二分子膜のイオン移動

白井 理*; 上原 章寛*; 山名 元*; 大貫 敏彦; 吉田 裕美*; 木原 壯林*

Shirai, Osamu*; Uehara, Akihiro*; Yamana, Hajimu*; Onuki, Toshihiko; Yoshida, Yumi*; Kihara, Sorin*

脂質二分子膜(BLM)中のイオン移動を電気化学的に検討した。疎水性イオンを加えた結果電流値が増加したこと、及び疎水性イオンがBLM中にも存在することから、対イオンも移動することが明らかとなった。

The ion transport from one aqueous phase (W1) to another (W2) across a bilayer lipid membrane (BLM) in a cell system in the presence of a hydrophobic ion or an ionophore was investigated by voltammetry. The hydrophobic ion was distributed into the BLM with the counter ion to hold the electroneutrality within the BLM. It was pointed out that the counter ion could transfer between W1 and W2 across the BLM since concentrations of the counter ion in W1, BLM and W2 were so high as to cause the ion transfer current while concentrations of the hydrophobic ion were very low. The facilitated transports of alkali ions across a BLM containing valinomycin (Val) used as an ionophore were also investigated by considering the hydrophobicity of both the objective cation and the counter anion and the formation of the alkali metal ion-Val complex..

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