| Popis: |
Plastic pollution is not inevitable. All the players in the food packaging industry are mobilizing to find alternatives to packaging made from petroleum products while maintaining its primary function of protecting the food. In this context, materials such as nanofibrillated cellulose, alginate and chitosan, which are natural, renewable and biodegradable resources, are showing their full interest and are the subject of much research. These polymers are compatible with each other and make it possible to obtain composite biomaterials with better mechanical, thermal and barrier properties than those used independently. . In this project, the objectives are to compare the water and oxygen barrier properties of films composed of NFC alginate, NFC chitosan and NFC alginate chitosan, by combining different percentages of these three polymers. This study will be completed by measuring the affinity of the lacasse enzyme with the NCF alginate and NCF chitosan films. The protocols used to manufacture the films and the proportions are based on those carried out by Valentina Roxana Birsan. The Moister Content, water solubility, water uptake tests and the angle measurement of a drop of water on the films using the goniometer show that the NCF + Chitosan films from 50% have a behavior hydrophobic whereas NCF + Alginate films are hydrophilic. The analysis of the polarity and the dispersion values of the films highlights that the NCF + Alginate films obtain better results for the oxygen barrier properties compared to the films composed of NCF + Chitosan. Films composed of 50% NFC +25% alginate +25% chitosan improve water barrier properties. Measurement of the oxygen barrier properties at 0% humidity showed that NCF + Alginate films are oxygen impermeable due to their high polarity. At 50% humidity, NCF + Alginate films show an overall decrease in oxygen barrier properties. However, the measurement of this barrier property for NCF + Chitosan films needs to be completed to have conclusive results. Finally, the evaluation of the affinity to the laccase enzyme of the NCF + Alginate films and of the NCF + Chitosan films was carried out by measuring the oxidation of laccase by ABTS with a spectrophotometer. For the films composed of NCF + Chitosan, only the films with 30% chitosan reveal an affinity to this enzyme. These results would require further investigation. Films with alginate show an affinity to laccase proportional to the amount of alginate they contain. The production of packaging films composed of these three polymers and in particular in the proportions of 50% NCF + 25% alginate + 25% chitosan, seems to be a promising avenue. A complementary study on the affinity of the laccase enzyme on these composite films as well as their oxygen barrier properties is necessary. Incoming |
