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Investigation of the Internal Chemical Composition of Chitosan-Based LbL Films by Depth-Profiling X-ray Photoelectron Spectroscopy (XPS) Analysis.
Taketa, Thiago B; Dos Santos, Danilo M; Fiamingo, Anderson; Vaz, Juliana M; Beppu, Marisa M; Campana-Filho, Sérgio P; Cohen, Robert E; Rubner, Michael F.
Afiliação
  • Taketa TB; School of Chemical Engineering, University of Campinas , 13083-852 SP, Campinas, Brazil.
  • Dos Santos DM; São Carlos Institute of Chemistry, University of São Paulo , 13010-111 SP, São Paulo, Brazil.
  • Fiamingo A; São Carlos Institute of Chemistry, University of São Paulo , 13010-111 SP, São Paulo, Brazil.
  • Vaz JM; School of Chemical Engineering, University of Campinas , 13083-852 SP, Campinas, Brazil.
  • Beppu MM; School of Chemical Engineering, University of Campinas , 13083-852 SP, Campinas, Brazil.
  • Campana-Filho SP; São Carlos Institute of Chemistry, University of São Paulo , 13010-111 SP, São Paulo, Brazil.
Langmuir ; 34(4): 1429-1440, 2018 01 30.
Article em En | MEDLINE | ID: mdl-29307187
Chitosan-based thin films were assembled using the layer-by-layer technique, and the axial composition was accessed using X-ray photoelectron spectroscopy with depth profiling. Chitosan (CHI) samples possessing different degrees of acetylation ([Formula: see text]) and molecular weight ([Formula: see text]) produced via the ultrasound-assisted deacetylation reaction were used in this study along with two different polyanions, namely, sodium polystyrenesulfonate (PSS) and carboxymethylcellulose (CMC). When chitosan, a positively charged polymer in aqueous acid medium, was combined with a strong polyanion (PSS), the total positive charge of chitosan, directly related to its [Formula: see text], was the key factor affecting the film formation. However, for CMC/CHI films, the pH of the medium and [Formula: see text] of chitosan strongly affected the film structure and composition. Consequently, the structure and the axial composition of chitosan-based films can be finely adjusted by choosing the polyanion and defining the chitosan to be used according to its DA and [Formula: see text] for the desired application, as demonstrated by the antibacterial tests.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Langmuir Assunto da revista: QUIMICA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Langmuir Assunto da revista: QUIMICA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos