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Yamasaki, Shinya; Shirai, Osamu*; Kano, Kenji*; Kozai, Naofumi; Sakamoto, Fuminori; Onuki, Toshihiko
Chemistry Letters, 42(8), p.819 - 821, 2013/08
Times Cited Count：5 Percentile：24.26(Chemistry, Multidisciplinary)The adsorption behavior of lanthanide ions (except for Pm) on liposomes composed of phosphatidylcholine and cholesterol was examined to understand the interaction between lanthanide ions and the phosphoryl moiety of phospholipids. The adsorption of lanthanide ions increased with an increase in pH under the weakly acidic conditions. Selective adsorption with the local maximum at the Er
ion and local minimum at the Er ion was observed, similar to the selective adsorption of the bacterial cell surface but different from that of orthophosphates. These results indicate that the adsorption of lanthanide on the phospholipid does not result from simple adsorption on orthophosphate functional groups but by the composition and molecular structure of the phospholipid. Our results strongly suggest that liposomes can be used as a simple biomembrane model without any biological activity for the study of adsorption of lanthanide ions.
Shirai, Osamu*; Onuki, Toshihiko; Kitazumi, Yuki*; Kano, Kenji*
Electroanalysis, 25(8), p.1823 - 1826, 2013/08
Times Cited Count：5 Percentile：18.12(Chemistry, Analytical)The ion transport current was clearly observed across a bilayer lipid membrane (BLM) between two aqueous phases (W1, W2) containing 0.1 M CsCl. In addition, the current density at a given potential between W1 and W2 increased using I instead of Cl as the counter ion. Our results strongly suggest that the cell membrane transport is partially responsible for the internal exposure of 
Cs and 
Cs.
Shirai, Osamu*; Ozaki, Shunsuke*; Onishi, Jun*; Kozai, Naofumi; Onuki, Toshihiko; Kano, Kenji*
Chemistry Letters, 38(11), p.1038 - 1039, 2009/11
Times Cited Count：6 Percentile：29.42(Chemistry, Multidisciplinary)Potential-controlled electrolysis was performed between two aqueous phases containing 0.1 M NaCl across a bilayer lipid membrane in the presence of dipicrylaminate (DPA
). By use of radioisotope (
Na), it has been confirmed that Na
is transported mainly and that DPA serves as a carrier of Na transport.
Suzuki, Yoshinori; Nankawa, Takuya; Onuki, Toshihiko; Taketa, Midori*; Higuchi, Yoshiki*; Tsujimura, Seiya*; Shirai, Osamu*; Kano, Kenji*
no journal, ,
Redox behavior of cytochrome c3 (cyt. c3) on the polyelectrolyte modified electrode was investigated by concurrent measurements of SOWG spectra and cyclic voltammetry. These measurements suggest that cyt. c3 desorbed from the elctrode as cyt. c3 was reduced. In the presence of U(VI), an electorcatalytic reduction of U(VI) by cyt. c3 was observed.
