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A Millipore DOPH model membrane is composed of a Millipore filter whose pores are filled with a lipid analogue, dioleylphosphate (DOPH). There is a possibility that the membrane may be used as a calcium ion sensor. The Millipore DOPH membrane, however, was not able to maintain the electrical characteristics more than 3 days. A PVC (polyvinylchloride)•EDOPH new artificial membrane which used a PVC instead of the Millipore filter to improve the membrane's life was made. By this replacement, the PVC•EDOPH membrane showed electrical characteristics similar to the Millipore DOPH membrane when the concentration of KC1 solution was decreased from 300 mM to 1 mM, and the electrical responses with the KC1 solution were observed more than 120 days. Two stable states of an electric membrane resistance are needed to keep the excitability observed in a living cell membrane. This paper showed also electric current-voltage characteristics which were measured by a current or a voltage clamp system. A current controlled negative resistance appeared in the new PVC membrane as well as in the Millipore membrane. According to electric capacitance measurements of the membrane, it was conceivable that the change of the resistance was caused by replacing Ca2+ ions with K+ ions in the hydrophilic groups of DOPH molecules. Since time responses of the membrane resistance change and capacitance one are so different with a kind of ion or its concentration that an application of ion sensor, for instance, a taste sensor can be expected by using two different parameters at the same time.

Characteristics of Electric Resistance and Capacitance in PVCDOPH Artificial Membrane.