Journal
FOOD BIOSCIENCE
Volume 36, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fbio.2020.100609
Keywords
Polymer active packaging; Silver nanoparticles; Antimicrobial; Antioxidant; Shelf life; Cytotoxicity
Categories
Funding
- Thailand's Education Hub for ASEAN Countries [TEH-AC 013/2017]
- Thailand Research Fund [RTA 6180006]
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Polyvinyl alcohol-chitosan (PVA-CH) films containing biogenic silver nanoparticles were prepared using solvent casting and particulate leaching. The films were characterized for structural, thermal, mechanical, and physical properties. Antimicrobial and antioxidant activities of the films were measured. The FTIR and XRD analysis showed that addition of Ag nanoparticles did not alter the structure of the PVA-CH films. Thermal analysis of the films showed that PVA-CH/Ag nanoparticles films were thermally stable. The thickness and contact angles showed significant difference after the addition of Ag nanoparticles (p < 0.05). Antimicrobial activity of PVA-CH/Ag nanoparticles (1:1) films showed bactericidal effects against important foodborne pathogenic bacteria (Escherichia coli O157:H7, Listeria monocytogenes, Staphylococcus aureus, and Bacillus cereus), with > 99.9% reduction. Antioxidant activities suggested an increased concentration-dependent free radical scavenging activity. In addition, PVA-CH/Ag nanoparticles showed first order release with Fickian diffusion and were non-toxic to Caco-2 cells at 1 mg/mL. The results suggested that addition of Ag nanoparticles did not alter the properties of the film, but rather increased its antimicrobial and antioxidant properties. Thus, this environmentally friendly packaging material may be able to be used to extend shelf life.
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