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Free radical grafting of gallic acid (GA) on cellulose nanocrystals (CNCS) and evaluation of antioxidant reinforced gellan gum films

Criado, Paula; Fraschini, Carole; Salmieri, Stéphane; Becher, Dorra; Safrany, Ágnes; Lacroix, Monique (2015). Free radical grafting of gallic acid (GA) on cellulose nanocrystals (CNCS) and evaluation of antioxidant reinforced gellan gum films Radiation Physics and Chemistry , vol. 118 . p. 61-69. DOI: 10.1016/j.radphyschem.2015.05.030.

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Résumé

Antiradical properties were introduced on cellulose nanocrystals (CNCs) by redox pair (RP) initiator and γ-radiation treatments. Different procedures were tested on CNC, first a 2 h reaction of hydrogen peroxide (H2O2)/ascorbic acid (AA) was performed on CNC solution. γ-Radiation treatment at 20 kGy dose was then applied and immediately after GA was reacted during 24 h with the pretreated CNCs, giving CNC-H2O2-AA-γ-GA. The formation of new carboxylic acids and carbonyl groups were characterized by FT-IR at 1650 and 1730 cm−1 respectively. Carboxylic acid functionalities were also analyzed by conductometric titration where an increase from 49 to 134 mmol COOH kg−1 was found from native to irradiated CNCs. A similar increase in the carboxylic acid content (132 mmol kg−1) was observed for CNC-H2O2-AA-γ-GA, showing the highest radical scavenging properties (8 mM Trolox eq/mg CNC). Thermogravimetric analysis confirmed the structural changes onto CNC. Film packaging containing 20% of CNC-H2O2-AA-γ-GA was then added to a gellan-based film packaging. A significant improvement (p<0.05) of the tensile strength (TS), the tensile modulus (TM) and the elongation at break (EB) and water vapor permeability reduction was observed when CNC-H2O2-AA-γ-GA was added to the film packaging formulation.

Type de document: Article
Mots-clés libres: Cellulose nanocrystals; Irradiation; Redox pair; Carboxylic acids; Antiradical; Food packaging
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 28 sept. 2017 18:49
Dernière modification: 28 sept. 2017 18:49
URI: http://espace.inrs.ca/id/eprint/3170

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