Microelectrode for potassium ions based on a neutral carrier and comparison of its characteristics with a cation exchanger sensor |
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Authors: | M Oehme W Simon |
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Institution: | Department of Organic Chemistry, Swiss Federal Institute of Technology, ZürichSwitzerland |
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Abstract: | A potassium-selective liquid-membrane microelectrode based on valinomycin is described. Tip diameters of about 2 μm as well as high discrimination against Na+, H3O+, acetylcholine and some other quaternary ammonium ions, allow the intracellular measurement of potassium ion activity changes. The inherently high membrane resistance of the neutral carrier-based microelectrodes is reduced by adding a lipophilic charge carrier to the valinomycin. Results are compared with those of classical microelectrodes. |
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