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  • Title: Valinomycin-based K+ selective microelectrodes with low electrical membrane resistance.
    Author: Ammann D, Chao PS, Simon W.
    Journal: Neurosci Lett; 1987 Feb 24; 74(2):221-6. PubMed ID: 3574760.
    Abstract:
    A valinomycin-based membrane phase for microelectrodes with relatively low electrical membrane resistances is described. Microelectrodes with tip diameters of about 1 micron exhibit resistances of about 10(10) omega. Extremely high K+ selectivities are obtained, e.g. a rejection of Na+ by a factor of 5000 and of acetylcholine by a factor of 3400. At a constant background of 140 and 500 mM Na+, the detection limit of the K+ sensor is at 1.6 X 10(-5) and at 2.5 X 10(-5) M K+, respectively.
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