Please use this identifier to cite or link to this item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/1211
Title: Hyaluronan/chitosan nanofilms assembled layer-by-layer and their antibacterial effect: A study using Staphylococcus aureus and Pseudomonas aeruginosa
Title of periodic: Colloids and Surfaces B
metadata.dc.title.subtitlejournal: Biointerfaces
Authors: Hernandez-Montelongo, J.
Lucchesi, E.G.
Gonzalez, I.
Macedo, W.A.A.
Nascimento, V.F.
Moraes, A.M. M.A. Cotta
Beppu, M.M.
Cotta, M.A.
Affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil
Itibanyl Produtos Especiais LTDA, Jarinu, SP, Brazil
Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, MG, Brazil
Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, MG, Brazil
Universidade Estadual de Campinas, Campinas, SP, Brazil
Universidade Estadual de Campinas, Campinas, SP, Brazil
Universidade Estadual de Campinas, Campinas, SP, Brazil
Universidade Estadual de Campinas, Campinas, SP, Brazil
Issue Date: 2016
Keywords: Nanofilms;Layers;Biopolymers;Staphylococcus aureus;Pseudomonas aeruginosas
Abstract: In the last few years, chitosan-based coatings have been proposed as antibacterial surfaces for biomedical devices in order to prevent nosocomial infections. In that sense, this work reports the optimized synthesis of hyaluronan/chitosan (HA/CHI) nanofilms assembled layer-by-layer in order to maximize the antibacterial effectfor two importanthumanpathogenic bacteria, Staphylococcus aureus and Pseudomonas aeruginosa. In this assembly, HA forms a soft, highly hydrated, and nontoxic film, whereas CHI shows the antimicrobial characteristics. Our HA/CHI nanofilm synthesis optimization was based on changing pH values of the biopolymer stem-solutions and the consequent variation of their ionization degree. Furthermore, the surface density of primary amino groups, which are related to the antibacterial effect, was also enhanced by increasing the number of HA/CHI bilayers. The antibacterial effect of HA/CHI nanofilms was evaluated by the spread plate counting method for both bacteria. These results were correlated with the morphology of nanofilms (characterized using SEM and AFM), as well as with their chemical properties studied by UV–vis, Kelvin Probe Force microscopy and XPS spectroscopy.
Access: R
Appears in Collections:Artigo de periódico

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