Dépôt numérique

Evaluation of antioxidant cellulose nanocrystals and applications in gellan gum films

Criado, Paula, Fraschini, Carole, Salmieri, Stéphane, Becher, Dorra, Safrany, Agnes et Lacroix, Monique (2015). Evaluation of antioxidant cellulose nanocrystals and applications in gellan gum films Industrial Biotechnology , vol. 11 , nº 1. p. 59-68. DOI: 10.1089/ind.2014.0017.

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The research described herein shows the treatment of cellulose nanocrystals (CNCs) led to antioxidant properties after 2 h of interaction with a redox pair—hydrogen peroxide (H2O2) and ascorbic acid (AA)—and 20 kGy irradiation. This procedure enhanced the surface of CNCs to react for 24 h with the antioxidant gallic acid (GA) at different mass ratios of CNC/GA (R=0.66 and 8). Each step of the modification was evaluated, but optimal results were found on CNC-H2O2-AA-γ-GA. Different analysis such as Fourier transform infrared spectroscopy exposed the apparition of a new band at 1730 cm−1, which can be explained by the formation of carbonyl groups on CNC. By studying the ultraviolet spectra of the different solutions, it was noticed that at wavelengths ∼290-nm intensity increases, showing a possible formation of aldehyde and carboxylic acids groups. This latter group was evaluated via conductometric titration, observing that CNC-H2O2-AA-γ-GA possesses 132 mmol COOH/kg and 8 mM Trolox eq/mL solution. A reduction in the thermal stability of CNC-H2O2-AA-γ-GA was found with thermogravimetric analysis, which confirms changes to the CNC surface. A 20% solution of the modified CNC-H2O2-AA-γ-GA was introduced onto a gellan gum matrix to create antioxidant film applications and enhanced mechanical properties. Improved (p≤0.05) tensile strength, tensile modulus, and water vapor permeability were observed with a decrease at the elongation at break in the film packaging formulation.

Type de document: Article
Mots-clés libres: -
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 28 sept. 2017 18:47
Dernière modification: 07 mai 2021 15:23
URI: https://espace.inrs.ca/id/eprint/3169

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