title: Polyelectrolyte films based on chitosan/olive oil and reinforced with cellulose nanocrystals.
abstract: Composite films designed as potentially edible food packaging were prepared by casting film-forming emulsions based on chitosan/glycerol/olive oil containing dispersed cellulose nanocrystals (CNs). The combined use of cellulose nanoparticles and olive oil proved to be an efficient method to reduce the inherently high water vapor permeability of plasticized chitosan films, improving at the same time their tensile behavior. At the same time, it was found that the water solubility slightly decreased as the cellulose content increased, and further decreased with oil addition. Unexpectedly, opacity decreased as cellulose content increased, which balanced the reduced transparency due to lipid addition. Contact angle decreased with CN addition, but increased when olive oil was incorporated. Results from dynamic mechanical tests revealed that all films present two main relaxations that could be ascribed to the glycerol- and chitosan-rich phases, respectively. The response of plasticized chitosan-nanocellulose films (without lipid addition) was also investigated, in order to facilitate the understanding of the effect of both additives.
authors.affiliation: Institute of Material Science and Technology (INTEMA), National University of Mar del Plata, Juan B. Justo 4302, 7600 Mar del Plata, Argentina; The International School of Paper, Print Media and Biomaterials (Pagora), Grenoble Institute of Technology, CS10065, F-38402 Saint Martin d'Hères Cedex, France.
authors.forename: Mariana
authors.initials: M
authors.lastname: Pereda
authors.forename: Alain
authors.initials: A
authors.lastname: Dufresne
authors.forename: Mirta I
authors.initials: MI
authors.lastname: Aranguren
authors.forename: Norma E
authors.initials: NE
authors.lastname: Marcovich
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D055595:Mechanical Phenomena; D053758:Nanoparticles / Q000737:chemistry*; D000069463:Olive Oil; D010539:Permeability; D010938:Plant Oils / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D014867:Water; D002482:Cellulose; D048271:Chitosan; D005990:Glycerol
keywords: Cellulose nanocrystals; Chitosan; Emulsion films; Olive oil