Cellulose Nanofiber-Based Ethylene Scavenging Antimicrobial Films Incorporated with Various Types of Titanium Dioxide Nanoparticles to Extend the Shelf Life of Fruits AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c00338

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TiO2 nanotubes (TNTs) were synthesized hydrothermally and modified by Cu2O using a sol–gel method to provide photocatalytic activity in visible light. Cellulose nanofiber (CNF)-based films were prepared by adding TiO2, TNTs, and Cu2O-modified TNT (TNT-Cu2O). The TiO2-based nanoparticles (TiO2, TNTs, and TNT-Cu2O) were uniformly distributed in the base polymer to make compatible and flexible films. The incorporation of nanoparticles significantly enhanced the UV-shielding properties of the film while slightly decreasing the transparency. Incorporating nanofillers improved the film’s mechanical and water resistance properties depending on the nanoparticle type. The TNT-Cu2O-added CNF film (CNF/TNT-Cu2O) showed the strongest antibacterial activity in visible light, followed by CNF/TNT and CNF/TiO2 films. The CNF-based films were used for tomato packaging to evaluate the ethylene scavenging property of the films. The CNF/TNT-Cu2O film scavenged ethylene gas produced in the headspace during storage, delaying the tomatoes’ discoloration, softening, and weight loss. CNF/TNT-Cu2O films are expected to be excellent composite films for the active packaging application of fruits and vegetables.