Filmes bioativos de quitosana, alginato e suas blendas aditivadas com nanoZnO : produção e caracterização

Abstract

In recent years it has been observed that the packaging sector stands out as an important segment contribute to the maintenance of product quality, increasing its shelf life and maintaining its nutritional value. Faced with this challenge, researchers are seeking new materials, new methodologies that can be applied in the manufacture of safety packaging that reduce environmental impact and facilitate the placement of information on the quality of the product to the consumer. In this study, pure films and films of blends of chitosan and alginate, with different proportions of the biopolymers, nanoZnO added with 0.2% and 0.1% were prepared by solution casting. Pure films and the blends were subjected to analysis to determine the mechanical properties; Infrared spectrometry (micro-FTIR); antimicrobian activity; solubility and color. With the biopolymer chitosan, alginate and the blends (chitosan / alginate), added or not with nanoZnO, it was possible to obtain flexible films and mechanical properties that allow using them in food packaging. The nanoZnO showed good dispersion in the films and their blends, especially when used in concentrations of 0.1%, making them more opaque, slightly yellowish and enhanced antimicrobial action. Therefore, the addition of nanoZnO did not affect negatively the physicochemical, mechanical and antimicrobial properties of the biopolymers, enabling to obtain bioactive films of the chitosan, alginate and their blends for use in food packaging.