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Antimicrobial and Photoantimicrobial Activities of Chitosan/CNPPV Nanocomposites

Facchinatto, William M ; Araujo, Leandro O ; Moraes, Tiago B ; Abelha, Thais F ; Lima, Thalita H. N ; Dos Santos, Danilo M ; Campana-Filho, Sérgio P ; Colnago, Luiz A ; Caires, Anderson R. L

MDPI 2022-10

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  • Título:
    Antimicrobial and Photoantimicrobial Activities of Chitosan/CNPPV Nanocomposites
  • Autor: Facchinatto, William M ; Araujo, Leandro O ; Moraes, Tiago B ; Abelha, Thais F ; Lima, Thalita H. N ; Dos Santos, Danilo M ; Campana-Filho, Sérgio P ; Colnago, Luiz A ; Caires, Anderson R. L
  • Assuntos: Chitosan ; Microbiologia ; Microbiology ; Nanoparticles ; Nanopartícules ; Quitosan
  • Notas: Articles publicats en revistes (Farmacologia, Toxicologia i Química Terapèutica)
    1661-6596
    International Journal of Molecular Sciences, 2022, vol. 23, p. 12519
    https://doi.org/10.3390/ijms232012519
    http://hdl.handle.net/2445/191944
    726025
    Reproducció del document publicat a: https://doi.org/10.3390/ijms232012519
  • Descrição: Multidrug-resistant bacteria represent a global health and economic burden that urgently calls for new technologies to combat bacterial antimicrobial resistance. Here, we developed novel nanocomposites (NCPs) based on chitosan that display different degrees of acetylation (DAs), and conjugated polymer cyano-substituted poly(p-phenylene vinylene) (CNPPV) as an alternative approach to inactivate Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria. Chitosan's structure was confirmed through FT-Raman spectroscopy. Bactericidal and photobactericidal activities of NCPs were tested under dark and blue-light irradiation conditions, respectively. Hydrodynamic size and aqueous stability were determined by DLS, zeta potential (ZP) and time-domain NMR. TEM micrographs of NCPs were obtained, and their capacity of generating reactive oxygen species (ROS) under blue illumination was also characterized. Meaningful variations on ZP and relaxation time T2 confirmed successful physical attachment of chitosan/CNPPV. All NCPs exhibited a similar and shrunken spherical shape according to TEM. A lower DA is responsible for driving higher bactericidal performance alongside the synergistic effect from CNPPV, lower nanosized distribution profile and higher positive charged surface. ROS production was proportionally found in NCPs with and without CNPPV by decreasing the DA, leading to a remarkable photobactericidal effect under blue-light irradiation. Overall, our findings indicate that chitosan/CNPPV NCPs may constitute a valuable asset for the development of innovative strategies for inactivation and/or photoinactivation of bacteria. Keywords: photoantimicrobial activity; blue-light irradiation; chitosan; CNPPV; nanocomposites; E. coli; S. aureus
  • Editor: MDPI
  • Data de criação/publicação: 2022-10
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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