Physical and thermal properties of a chitosan/alginate nanolayered PET film

Abstract

Nanolaminates have been reported to have applications in different areas, such as the preparation of multilayer films, coating biomedical appliances or multilayer edible coatings with enhanced properties for applications in the food industry. This work aims at characterizing the surface properties, water vapor permeability, and thermal and mechanical properties of a nanolayered film. The film was produced using two polysaccharides with opposite charges, chitosan and sodium alginate deposited on to aminolyzed/charged PET. Contact angle measurements showed differences in the films with a successively higher number of layers. SEM images allowed the measurement of the thickness of the layers. The nanolayered film had a water vapor permeability of (0.85 ± 0.04) × 10 −11 g m −1 s −1 Pa −1 and a hardness increase of 0.245 ± 0.06 GPa. DSC and TG analyses of the nanolayered film showed increases of 39.2% in the melting energy when compared with the PET film used as support, and a decrease in the decomposition temperature from 386 to 331 • C.

Physical effects upon whey protein aggregation for nano-coating production

“…These nanolayered coatings exhibited lower WVP and oxygen permeability (O2P) values ) when compared with those obtained for conventional edible films composed of chitosan (Fajardo et al, 2010) and of ι-carrageenan (Hambleton, Debeaufort, Beney, Karbowiak, & Voilley, 2008) -see Table 5. Also, the κ-carrageenan/chitosan nanolayered coating showed a WVP value which was very similar to that obtained for an alginate/chitosan (Carneiro-da-Cunha et al, 2010) and κ-carrageenan/lysozyme nanolayered coating (see Table 5). …”

Effect of an Edible Nanomultilayer Coating by Electrostatic Self-Assembly on the Shelf Life of Fresh-Cut Mangoes

“…The samples were randomly divided into two groups (control and test), four pieces of each mango by group, totaling 200 pieces per group. Coating solutions (Alg and Ch) were applied on the test group by the layer-by-layer technique as described by Carneiro-da-Cunha et al (2010); no coating was applied to the control group. Layer-by-layer technique consisted in the deposition of multiple nanolayers of Alg and Ch in fresh-cut mangoes surface.…”

Mechanical and Barrier Properties of LLDPE/Chitosan Blown Films for Packaging

“…Chitosan has been found to be non-toxic, biodegradable, biofunctional, biocompatible and has promising application prospect in the biomedical and food fields. [6][7][8][9] Chitosan films have been successfully used as a packaging material for the quality preservation of a variety of foods. 10 But water vapour sensitivity and poor mechanical CHINESE PACKAGING INSTITUTE -2014 CONFERENCE of 16 scans was recorded.…”