ИСТИНА

Conductive polymers have attracted considerable attention for electrochemical sensors elaboration. One of the most widespread polymer is polyaniline due to its high conductivity, electroactivity, chemical stability and ease of synthesis. Although functionalized polyanilines have been known for years, the boronic acid-substituted polyaniline has been reported only recently. Thanks to ability of phenylboronic acid to selectively and reversibly bind to compounds, containing 1,2-, 1,3-diol-moieties, it can serve as recognition element of sensors. The poly(anilineboronic acid) (PABA) was known to be obtained via electropolymerization of aminophenylboronic acid exceptionally in the presence of fluoride-ions. In this work we performed the electrochemical synthesis of conductive polymer from 3-aminophenylboronic acid using hydroxy acids instead of F–. Hydroxy acids are suitable molecules for synthesis of conductive PABA as binding constants of hydroxy acids with phenylboronic acid display their highest values in weakly acidic solutions, required for conductive polyaniline formation. The imprinting of hydroxyacids into polymer matrix during electropolymerization with their subsequent removal from the resulting material allows managing sensing properties of PABA. We investigated the potentiometric response of sensors based on PABA molecularly imprinted with lactic, tartaric and citric hydroxy acids. The developed sensors for potentiometric detection of lactate and glucose were integrated in flow-injection system. It was shown that poly(anilineboronic acid) complexation with saccharide or hydroxy acid shifts the electrochemical potential of the system. We`ve investigated the influence of hydroxy acid used for polymerization of aminophenylboronic acid on the concentration profiles.