Magnesium and calcium-dependent membrane potential of poly(pyrrole) films doped with adenosine triphosphate

被引：15
作者：
Migdalski, J [1 ]
Blaz, T
Paczosa, B
Lewenstam, A
机构：
[1] Stanislaw Staszic Univ Min & Met, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland
[2] Abo Akad Univ, Proc Chem Grp, Ctr Proc Analyt Chem & Sensor Technol ProSens, FIN-20500 Turku, Finland
来源：
MICROCHIMICA ACTA | 2003年 / 143卷 / 2-3期
关键词：
poly(pyrrole); adenosine triphosphate; membrane potential; active potential; cationic sensitivity; dynamic discrimination; surface concentration;
D O I：
10.1007/s00604-003-0059-4
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Polypyrrole-adenosinotriphosphate (PPy-ATP) films (membranes) were electropolymerized on platinum or glassy carbon and made sensitive to magnesium and calcium ions by conditioning. Close-to-Nernstian potentiometric sensitivity was observed for the films under equilibrium. During equilibration provoked by the change in concentration of magnesium and/or calcium ions, a characteristic transitory potential response of PPy-ATP film was observed. This behaviour is ascribed to the surface concentration changes of magnesium and calcium ions during equilibration via ion-exchange at ATP membrane sites. It is suggested that PPy-ATP film may be used as a model membrane to study the potential formation of the biological membranes, where the calcium and magnesium interaction with ATP is of primary importance.
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收藏
页码：177 / 185
页数：9
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