Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 99, Issue -, Pages 827-837Publisher
ELSEVIER
DOI: 10.1016/j.msec.2019.02.027
Keywords
Polypyrrole; Antibacterial; Bacterial inactivation; Biofilm
Categories
Funding
- FINEP [04.13.0042.03]
- CAPES (Project ELINOR)
- FAPESB
- FACEPE [APQ-0616-1.05/15, APQ-0980-1.05/14, DCR-0019-1.05/16]
- CNPq [DCR-0019-1.05/16, 470411/2013-9]
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The adhesion of pathogenic bacteria in medical implants and surfaces is a health-related problem that requires strong inhibition against bacterial growth and attachment. In this work, we have explored the enhancement in the antibacterial activity of metal free-based composites under external electric field. It affects the oxidation degree of polypyrrole-based electrodes and consequently the antibacterial activity of the material. A conductive layer of carbon nanotubes (graphite) was deposited on porous substrate of polyurethane (sandpaper) and covered by polypyrrole, providing highly conductive electrodes characterized by intrinsic antibacterial activity and reinforced by electro-enhanced effect due to the external electric field. The bacterial inhibition of composites was monitored from counting of viable cells at different voltage/time of treatment and determination of biofilm inhibition on electrodes and reactors. The external voltage on electrodes reduces the threshold time for complete bacterial inactivation of PPy-based composites to values in order of 30 min for Staphylococcus aureus and 60 min for Escherichia coli.
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