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Cell-assisted synthesis of conducting polymer - polypyrrole - for the improvement of electric charge transfer through fungal cell wall.
Colloids and Surfaces. B, Biointerfaces 2018 December 12
In this research we report the biological synthesis of electrically conducting polymer - Polypyrrole (Ppy). Cell-assisted enzymatic polymerization/oligomerization of Ppy was achieved using whole cell culture and cell-free crude enzyme extract from two white-rot fungal cultures. The selected fungal strains belong to Trametes spp., known laccase producers, commonly applied in bioremediation and bioelectrochemical fields. The biocatalytic reaction was initiated in situ through the copper-containing enzymes biosynthesized within the cell cultures under submerged aerobe cultivation conditions. The procedure was inspired by successful reports of laccase-catalyzed pyrrole polymerization. The usage of whole culture and/or crude enzyme extract has the advantage of overcoming enzyme purification and minimizing the liability of enzyme inactivation through improved stability of enzymes in their natural environment. Spectral and electrochemical techniques (UV-vis spectroscopy, infrared spectroscopy; cyclic voltammetry (CV)) and pH measurements provided insight into the evolution of pyrrole polymerization/oligomerization and the electrochemical features of the final product. Microscopy techniques (optical microscopy and scanning electron microscopy (SEM)) were primary tools for visualization of the formed Ppy particles. The relevance of our research is twofold: Ppy prepared in crude enzyme extract results in enzyme encapsulated within Ppy and/or Ppy-modified fungal cells can be formed when polymerization occurs in whole cell culture. The route of biocatalysis can be chosen according to the desired bioelectrochemical application. The reported study focuses on the improvement of charge transfer through the fungal cell membrane and/or cell wall by modification of the fungal cells with conducting polymer - polypyrrole.
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