Enhanced functionality of colloidal polyaniline/polyvinyl alcohol nanocomposite as an antibacterial agent

Abstract

This study describes the preparation of colloidal polyaniline/polyvinyl alcohol (PAn/PVA) nanocomposite by chemical polymerization of aniline (AN) in the presence of ammonium peroxydisulphate (APS) as an oxidant and PVA as a stabilizer. The product was characterized morphologically using a scanning electron microscope (SEM) and transmission electron microscopy (TEM), chemically using Fourier transform infrared (FTIR) and optically UV-visible. The prepared polymer was then tested for the antibacterial properties against gramnegative bacteria: Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa); and grampositive bacteria: Staphylococcus aureus (S. aureus). The antibacterial properties were assessed by disk diffusion, minimum inhibitory concentration (MIC), minimum bactericidal concentrations (MBCs), and the bactericidal effect methods. The results clearly showed that colloidal PAn/PVA nanocomposite strongly inhibits the growth of wild-type E. coli (19 6 0.5) mm followed by P. aeruginosa (17 6 0.5 mm) and S. aureus (17.5 6 0.5 mm) bacteria. S. aureus was completely killed after exposure for only 15 min, whereas S. aureus and E. coli were completely killed after exposure for 25 min. J. VINYL ADDIT. TECHNOL., 00:000-000, 2014.

Light Controllable Surface Coating for Effective Photothermal Killing of Bacteria

“…The electronic properties of π−π* transition of the polymeric backbone benzenoid ring with excited quinoid ring arose from charge transfer to the adjacent benzenoid rings, with each side contributing broad absorption specifically near the NIR area. 21 Moreover, UV−vis−NIR absorption on PET (polyethylene terephthalate) substrate coated PVPS:PANI film has also shown a similar NIR band in that area (Figure S2, Supporting Information). As the stability of composite materials is an important issue during application, the PVPS:PANI was evaluated for 30 days, during which the stability of the broad NIR absorption band was maintained.…”

“…The spectrum of PVPS:PANI was dominated by a broad absorption band from the UV–vis to NIR region. The electronic properties of π–π* transition of the polymeric backbone benzenoid ring with excited quinoid ring arose from charge transfer to the adjacent benzenoid rings, with each side contributing broad absorption specifically near the NIR area . Moreover, UV–vis–NIR absorption on PET (polyethylene terephthalate) substrate coated PVPS:PANI film has also shown a similar NIR band in that area (Figure S2, Supporting Information).…”

Polyrhodanine-based nanomaterials for biomedical applications: A review

“…It can be indicated that the PR structure contains functional groups that interfere with the cell walls and membranes within microorganisms [ 67 ]. The electrostatic contact between cationic and the negative-charged cell wall components led to cell membrane damage and, therefore cell death [ 68 ]. Moreover, as a comparison between PR/NiFe 2 O 4 nanocomposites with two commonly used antibiotics (Streptomycin and Chloramphenicol) referring to the research results of Kheshtzar et al [ 69 ], the inhibition growth radius for Streptomycin was 6.3 and 6 mm against S .…”