Electrochemical synthesis of polypyrrole layers doped with glutamic ions

Abstract

Electrochemically synthesized polypyrrole thin films doped with glutamic ions were investigated as interesting materials for potential use as molecularly selective surfaces. Pyrrole and glutamate interact in aqueous solution, resulting in the formation of a prominent band at 240 nm in the absorption spectra of the solution. This feature was assigned to the formation of a complex, which significantly influences the electrochemical deposition of polypyrrole films doped with glutamate. It was also detected that oxidation of these complexes leads to the appearance of a shoulder in the absorption spectrum at 270 nm, which corresponds to the yellowish color of pyrrole aged under influence of air. A mechanism is proposed for polymer film growth in aqueous solutions containing monosodium L-glutamate and pyrrole. It takes into account the observed influence of the pH of the solution, the concentration of reagents, the zwitterionic properties of glutamate on deposition, and results from spectroscopic measurements. It is also shown that glutamic ions can electrochemically be released from the synthesized polymer layers.

Electrochemically synthesized polymers in molecular imprinting for chemical sensing

“…In investigations of the mechanism of the potentiostatic deposition of MIPPy films in the presence of glutamate, the electropolymerization conditions, including concentrations and the concentration ratio of the template and functional monomer as well as the solution pH, were optimized [ 100 ]. It appeared that the mechanism was unique, being different from that of the analogous mechanism of deposition of the film of MIPPy templated with glutamate in an alkaline solution (pH = 9.0).…”

Chemical polymerization of pyrrole in the presence of l‐serine or l‐glutamic acid: Electrically controlled amoxicillin release from composite hydrogel

“…This assumption is supported by previous reports of polymerization of pyrrole in the presence of simple amino acids. Specifically, the finding of strong interaction between glutamic ions and pyrrole moieties during the electrochemical deposition of PPy films and the glycine inclusion in PPy matrix when the polymer was prepared by chemical oxidation of pyrrole with APS in the presence of this amino acid …”

“…Meteleva‐Fischer et al . investigated the mechanism of the electrochemical deposition of PPy films doped with l ‐glutamic ions . Their study showed that glutamic ions interact strongly with pyrrole molecules, apparently in form of a complex.…”

Determination of coccidiostat clopidol on an electropolymerized-molecularly imprinted polypyrrole polymer modified screen printed carbon electrode

“…11 For instance, a poly(o-phenylenediamine) lm was used for the detection of glucose 12 and polypyrrole-based MIPs enabled the detection of glutamic acid as a template molecule. 13 An amperometric morphine sensor 14 was also prepared using the concept of MIPs. Besides, the detection of analytes binding with electropolymerized layers of MIPs was performed using different techniques.…”