Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 17, Pages 16040-16047Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02649
Keywords
nanocellulose; oleofilm; emulsion; active packaging; edible barrier
Funding
- European Union's Horizon 2020 research and innovation program [674979-NANOTRANS, 676045-MULTIMAT]
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Low-concentration oil-in-water emulsions stabilized by cellulose nanofibrils (CNFs) extracted from primary plant cell wall materials are used to prepare thin biobased CNF-oil composite films by solvent casting. Flexible, transparent, and biodegradable composite films are obtained, with increased thermal stability (up to 300 degrees C) as the oil concentration increases. Examination of the microstructure demonstrates a clear dependency on the oil content, as a multilayered structure where the oil phase trapped between two layers of CNFs is appreciated at high oil concentrations. The embedded oil significantly influences the mechanical and wetting properties of the films, confirming their potential for use in packaging systems. Encapsulation of curcumin in the composite films leads to an increased antioxidant (up to 30% radical scavenging activity) and antimicrobial activity, inhibiting the growth of foodborne bacteria such as Escherichia coll. The resulting composite films show promising results in the field of active packaging for applications in the food, pharmaceutical, and cosmetic industries.
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