PEDOT:PSS-coated polybenzimidazole electroconductive nanofibers for biomedical applications

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Authors
Sordini, L.
Silva, J.C.
Garrudo, F.F.F.
Rodrigues, C.A.V.
Marques, A.C.
Linhardt, Robert J.
Cabral, J.M.S.
Morgado, J.
Castelo Ferreira, F.
Issue Date
2021-08-02
Type
Article
Language
ENG
Keywords
Biology , Chemistry and chemical biology , Chemical and biological engineering , Biomedical engineering
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Abstract
Bioelectricity drives several processes in the human body. The development of new materials that can deliver electrical stimuli is gaining increasing attention in the field of tissue engineering. In this work, novel, highly electrically conductive nanofibers made of poly [2,2′-m-(phenylene)-5,5′-bibenzimidazole] (PBI) have been manufactured by electrospinning and then coated with cross-linked poly (3,4-ethylenedioxythiophene) doped with poly (styrene sulfonic acid) (PEDOT:PSS) by spin coating or dip coating. These scaffolds have been characterized by scanning electron microscopy (SEM) imaging and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy. The electrical conductivity was measured by the four-probe method at values of 28.3 S·m−1 for spin coated fibers and 147 S·m−1 for dip coated samples, which correspond, respectively, to an increase of about 105 and 106 times in relation to the electrical conductivity of PBI fibers. Human bone marrow-derived mesenchymal stromal cells (hBM-MSCs) cultured on the produced scaffolds for one week showed high viability, typical morphology and proliferative capacity, as demonstrated by calcein fluorescence staining, 4′,6-diamidino-2-phenylindole (DAPI)/Phalloidin staining and MTT [3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyl tetrazolium bromide] assay. Therefore, all fiber samples demonstrated biocompatibility. Overall, our findings highlight the great potential of PEDOT:PSS-coated PBI electrospun scaffolds for a wide variety of biomedical applications, including their use as reliable in vitro models to study pathologies and the development of strategies for the regeneration of electroactive tissues or in the design of new electrodes for in vivo electrical stimulation protocols.
Description
Polymers, 13, 2786
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Full Citation
PEDOT:PSS-coated polybenzimidazole electroconductive nanofibers for biomedical applications, L. Sordini, J. C. Silva, F. F. F. Garrudo, C. A. V. Rodrigues, A. C. Marques, R. J. Linhardt, J. M. S. Cabral, J. Morgado, F. Castelo Ferreira, Polymers, 13, 2786, 2021.
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)
Journal
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PubMed ID
DOI
ISSN
20734360
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