Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 10, Issue 28, Pages 9265-9274Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c01793
Keywords
cellulose nanocrystals; functional nano fi llers; antibacterial; rechargeable; active packaging
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2019-04498]
- Natural Sciences and Engineering Research Council of Canada Discovery Launch Supplement (NSERC) [DGECR-2019-00472]
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The study demonstrated the use of modified cellulose nanocrystals (CNCs) as antibacterial nanofillers, which significantly improved the mechanical and UV barrier properties of plastic films, and exhibited excellent antibacterial efficacy in active packaging.
ABSTRACT: Growing food safety concerns have required the development of functional films incorporated with antibacterial nanofillers for active packaging, and cellulose nanocrystals (CNCs) are promising candidates due to their unique morphology and availability for modification. Herein, this study aims to develop an approach to producing functional CNCs that can be easily incorporated into commercial plastic films as antibacterial nanofillers for active packaging. Particularly, CNCs extracted from cotton textile waste were selected as a model and modified with methacrylamide (MAM). Cellulose acetate (CA) and poly(vinyl chloride) (PVC) were chosen as film-forming agents, and the modified CNCs (MAM-CNCs) were incorporated by the solution casting method. Addition of MAM-CNCs significantly improved the mechanical and UV barrier properties of CA and PVC films. After chlorination, the composite films with 3% MAM-CNCs exhibited excellent antibacterial efficacy against common foodborne pathogens, e.g., higher than 6 log reduction of Staphylococcus aureus and Escherichia coli after 1 h of contact at 37 degrees C. Moreover, this antibacterial capacity could be recharged by chlorination without affecting the mechanical performance of plastic films. Therefore, this work reveals the potential of utilizing modified CNCs to fabricate functional packaging materials.
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