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Alginate-based multifunctional films incorporated with sulfur quantum dots for active packaging applications

Riahi, Z ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.colsurfb.2022.112519
  3. Publisher: Elsevier B.V , 2022
  4. Abstract:
  5. Sulfur quantum dots (SQDs) were fabricated using a facile hydrothermal method and used for the preparation of functional food packaging film and compared the properties with other sulfur-based fillers like elemental sulfur (ES) and sulfur nanoparticles (SNP). The SQDs have an average size of 5.3 nm and were very stable in aqueous suspension. Unlike other sulfur-based fillers, the SQD showed high antioxidant, antibacterial and antifungal activity, but no cytotoxicity was found for L929 mouse fibroblasts even after long-term exposure of 48 h. When sulfur-based fillers were added to the alginate film, SQD was more evenly dispersed in the polymer matrix than SNP and ES. The addition of SQD to the alginate film increased the film's UV barrier property by 82% and tensile strength by 18%. Also, the addition of SQDs to the films did not affect the stiffness (elastic modulus, EM) and water vapor barrier permeability (WVP) of the films. In addition, SQD-added films exhibited excellent antioxidant and strong antibacterial activity against bacterial (E. coli and L. monocytogenes) and fungal (A. niger and P. chrysogenum) food pathogens. When the film was applied as a bread packaging test, the SQD-added film prevented mold growth for 14 days, unlike the ES and SNP-added films. © 2022 Elsevier B.V
  6. Keywords:
  7. Antibacterial activity ; Antifungal activity ; Antioxidant activity ; Functional fillers ; Sulfur quantum dots ; Cell culture ; Chitosan ; Fillers ; Film preparation ; Fungi ; Nanocrystals ; Packaging materials ; Suspensions (fluids) ; Tensile strength ; Active food packaging ; Active packaging ; Alginate films ; Anti-bacterial activity ; Antifungal activities ; Antioxidant activities ; Elemental sulphur ; Functional fillers ; Packaging applications ; Sulphur quantum dot ; Semiconductor quantum dots ; Quantum dot ; Sulfur ; Alginic acid ; Antiinfective agent ; Antioxidant ; Animal cell ; Aspergillus niger ; Controlled study ; Cytotoxicity ; Listeria monocytogenes ; Mouse ; NCTC clone 929 cell line ; Nonhuman ; Penicillium chrysogenum ; Permeability barrier ; Rigidity ; Ultraviolet radiation ; Water vapor ; Young modulus ; Animal ; Procedures ; Alginates ; Animals ; Anti-Bacterial Agents ; Antioxidants ; Escherichia coli ; Food Packaging ; Mice ; Permeability ; Quantum Dots
  8. Source: Colloids and Surfaces B: Biointerfaces ; Volume 215 , 2022 ; 09277765 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0927776522002028