Modulating biopolymer electrical charge to optimize the assembly of edible multilayer nanofilms by the layer-by-layer technique

Acevedo Fani, Alejandra; Salvia Trujillo, Laura; Soliva-Fortuny, Robert; Martín Belloso, Olga

doi:https://doi.org/10.1021/acs.biomac.5b00821

View/Open

Postprint (2.150Mb)

Issue date

2015

Author

Acevedo Fani, Alejandra

Salvia Trujillo, Laura

Soliva-Fortuny, Robert

Martín Belloso, Olga

Suggested citation

Acevedo Fani, Alejandra; Salvia Trujillo, Laura; Soliva-Fortuny, Robert; Martín Belloso, Olga; . (2015) . Modulating biopolymer electrical charge to optimize the assembly of edible multilayer nanofilms by the layer-by-layer technique. Biomacromolecules, 2015, vol. 16, núm. 9, 2895-2903. https://doi.org/10.1021/acs.biomac.5b00821.

Abstract

The aim of this work was to study the influence of biopolymer (alginate, ALG; chitosan, CHI) charge on the formation of multilayer nanofilms by the layer-by-layer (LbL) technique. The electrical charge of ALG and CHI (high, medium, or low) was modulated by adjusting the pH of biopolymer solutions. The amount of biopolymer deposited in multilayers depended on the charge of ALG and CHI solutions. The lower the charge the higher the deposition rate due to the higher number of biopolymer molecules needed to neutralize the previous layer. Medium and low charge biopolymers led to a drastic change in the wettability of multilayers, with ALG layers being strongly hydrophilic and CHI layers strongly hydrophobic. The surface ζ-potential alternatively changed from negative to positive using ALG or CHI. This effect was more pronounced using highly charged biopolymers. Results obtained in this study evidenced that the multilayers properties can be tuned by controlling the biopolymer electrical charge.

URI

http://hdl.handle.net/10459.1/59173

DOI

https://doi.org/10.1021/acs.biomac.5b00821

Is part of

Biomacromolecules, 2015, vol. 16, núm. 9, 2895-2903