General description Visit our Sensor Applications portal to learn more. Other Notes Macrocyclic polyethers with repeating (-CH2CH2O) units. The compounds are ionophoric (form stable complexes with cations). Host compound1. Sodium ionophore for assaying Na+-activities with grafted wire sodium-selective electrodes. It can be used either in a liquid membrane or in a PVC solid membrane2,3 Legal Information Selectophore is a trademark of Sigma-Aldrich GmbH