1. Constant Potential Amperometric Flow-Injection Analysis of Ions and Neutral Molecules Transduced by Electroactive (Conductive) Polymers
- Author
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Marina D. Zavolskova, Elena E. Karyakina, Arkady A. Karyakin, Vita N. Nikitina, and Ekaterina D. Maksimova
- Subjects
chemistry.chemical_classification ,Conductive polymer ,Flow injection analysis ,Chemistry ,010401 analytical chemistry ,Polymer ,010402 general chemistry ,01 natural sciences ,Amperometry ,0104 chemical sciences ,Analytical Chemistry ,Ion ,Chemical engineering ,Molecule ,Constant (mathematics) ,Electrical conductor - Abstract
We first report on constant potential (dc) amperometric flow-injection analysis (FIA) transduced by electroactive (conductive) polymers. Amperometric response is caused by the polymer recharging in order to maintain the electrode potential at a constant level when (i) ions are crossing the film|solution interface and polarizing electrode|film interface or (ii) ions or neutral molecules are specifically interacting with the polymer recharging it. The response under constant solution flow is a current peak and in flow-injection mode is a couple of current peaks directed opposite of the first sharp, analytically valuable peak. In both constant flow and flow-injection regimes, the peak current is dependent on analyte concentrations; obviously, the FIA mode provides more advantageous analytical characteristics. Constant potential amperometric flow-injection analysis is shown for boronate- and sulfate-functionalized polyanilines as well as for Prussian Blue, a member of the inorganic polymer family. As a proof of concept, the successful dc amperometric detection of lactate in human sweat with boronate-functionalized polyaniline has been shown. The proposed approach would revolutionize the field of conductive/electroactive polymer-supported ion sensing with the introduction of reliable and robust amperometry as a valuable alternative to existing potentiometry.
- Published
- 2019