Active food packaging prepared with chitosan and olive pomace

Cross‐linking of chitosan film composites was carried out by using conventional heating and microwave curing methods in this study. Non‐cross‐linked and glutaraldehyde (GA) cross‐linked neat chitosan and cellulose nanocrystals (CNC)/chitosan film composites were cured by either conventional oven heating or microwave irradiation. Tensile strength and Young's modulus of chitosan composites were enhanced significantly by the addition of CNC and GA especially for the microwave‐cured samples. The changes in chemical interaction of the chitosan film composites was determined by Fourier transform infrared (FTIR) spectroscopy. The microwave‐cured GA‐cross‐linked chitosan film composites were more thermally stable than non‐cross‐linked and conventionally heated GA‐cross‐linked chitosan film composites due to the formation of a more stable structure between GA and chitosan. Nevertheless, the reduced antimicrobial efficacy of film composites against Escherichia coli, Bacillus subtilis, and Saccharomyces cerevisiae was observed in cross‐linked film composites compared with non‐cross‐linked composites.

Section: Preparation Of Cnc/chitosan Film Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study on the properties of cross‐linked cellulose nanocrystals/chitosan film composites with conventional heating and microwave curing

Gan

Sam

Abdullah

et al. 2020

“…A suitable combination of a natural and a synthetic polymer improves the properties of the resulting material, which expands its application field. This methodology of synthesis has proved to be appropriate in areas such as biomedical materials, controlled release systems, biological tissue engineering and packaging, food packaging …”

Section: Introductionmentioning

confidence: 99%

Original antifouling strategy: Polypropylene films modified with chitosan‐coated silver nanoparticles

Mosconi

Stragliotto

Slenk

et al. 2019

A new coating strategy of polypropylene (PP) films with silver nanoparticles (AgNPs) is proposed to obtain surfaces with antifouling properties. As a first step, the photograft polymerization is used to produce polyacrylic acid-grafted PP (PAA-grafted PP) films. A green AgNP synthesis is used by thermal reduction of AgNO 3 with amino groups of chitosan (CS), which controls ion diffusion and stabilizes nanoparticles. AgNP/CS complexes are adsorbed on PAA-grafted PP by electrostatic interactions, yielding AgNP/CS-coated PP films. These films show an excellent antimicrobial activity, even for AgNP contents as low as 0.08 wt %, reducing more than 4 log units in the viable Staphylococcus aureus concentration or inducing Escherichia coli death. This trend is consistent with an adequate amount of small AgNP adsorbed in an organized manner within a thin surface layer. Therefore, the antimicrobial activity of this film seems to be more than promising, used as an active surface for a wide range of applications.A suitable combination of a natural and a synthetic polymer improves the properties of the resulting material, which expands its application field. This methodology of synthesis has proved to be appropriate in areas such as biomedical materials, controlled Additional Supporting Information may be found in the online version of this article.

“…This waste has already been used in polymers as polypropylene, poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate), chitosan, plasticized wheat gluten, and mechanical, thermal properties as well as matrix‐OP compatibility of resulting composites, were investigated. In order to select more suitable fractions, fractionation of OP was also carried out and its influence on composition and properties was studied …”

Section: Introductionmentioning

confidence: 99%

Assessment of olive pomace wastes as flame retardants

Kassis

Otazaghine²,

Hage

et al. 2019

Olive pomace (OP) is a lignocellulosic waste from olive oil industry. In order to valorize these wastes as flame retardant (FR) fillers into polymers, OP residues are milled and screened into three different fractions. Two strategies are then investigated. The first one is to modify OP particles by phosphorus molecules using radiation grafting as already done successfully with flax. Nevertheless, pyrolysis combustion flow calorimetry analyses show that the introduction of phosphorus does not promote charring of OP and flame retardancy is not significantly improved whichever the considered fraction. The second strategy is to replace pentaerythritol by OP as char source into well-known FR systems based on ammonium polyphosphate. The incorporation of such system into ethylene-vinyl acetate copolymer leads to satisfying FR performances according to cone calorimeter tests. Moreover, the presence of high amount of extractives into OP such as oleic acid does not appear detrimental.