A liquid ion-exchange membrane electrode using the antibiotic valinomycin is most selective for Potassium.
Liquid ion-exchange membrane electrodes use a liquid ion-exchanger which is held in position in an inert, permeable hydrophobic membrane. The electrodes are selective as the ion exchangers selectively interchange a single analyte ion.
Valinomycin is a natural, lipid-soluble molecule that binds potassium ions (K+) and enables their transfer past lipid bilayers. It is a macrocyclic molecule made from 12 alternating amino acids and esters, produced by specific Streptomyces.
Valinomycin is extremely selective for potassium ions over sodium ions within the cell membrane. It functions as a potassium-specific transporter and enables the movement of potassium ions across lipid membranes down the electrochemical potential gradient.
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