The influence of the plasticizer nature on the selectivity of ion-selective electrodes to physiologically active amine cations: Regularities and abnormalities

Recent Advances in Plasticizers

“…contain an amino functional group, in their structure, more or less substituted or a nitrogen atom included in a heterocyclic compound. They are called physiologically active amines (PPA) (Egorov et al, 2010). The ISEs selectivity towards the cations formed by the PPA can be controlled by changing the nature of the plasticizer, the ion exchanger or by introducing a neutral carrier capable of selectively complexing the analyte ions in the membranes.…”

“…The most used method, and probably, the most effective method is the variation of the plasticizer's nature. The influence of the plasticizer's nature upon its selectivity towards PPAs was investigated (Egorov et al, 2010). Different PVC membrane compositions and ISEs sensible to PPAs were prepared and studied.…”

“…It was established that by increasing the plasticizer's basicity there is a pronounced increase in membrane selectivity towards PPA cations with a low substitution of the salt forming nitrogen atom. PPA atoms that contain non-ionic polar groups and can form hydrogen bonds with Lewis bases behave in the same way, but PPA cations forming intermolecular hydrogen bonds are an exception (Egorov et al, 2010;Kulapina & Barinova, 1997). The effect of the ion exchanger's nature upon PPA cation selectivity was stronger when plasticizers with low basicity were used.…”