Journal
NANOMATERIALS
Volume 8, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/nano8110930
Keywords
alginate film; nanocomposites; antibacterial properties; food packaging
Categories
Funding
- Shenzhen overseas special fund for high-level talents [KQJSCX2017033116171850]
- Shenzhen Science and Technology Research Funding [JCYJ20160608141439330]
- Shenzhen Science and Technology research and development Research Project [JSGG20160229201849420]
- Hong Kong Research Grants Council (RGC) General Research Funds (GRF) [CityU 11301215, 11205617]
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A degradable and antibacterial sodium alginate film containing functional Au-TiO2 nanocomposites for food packaging was successfully developed. The Au-TiO2 nanocomposites are synthesized hydrothermally and mixed with the alginate solution to form the film by a casting method. The Au-TiO2 nanocomposites enable the film with excellent visible light absorption and transfer ability with the light absorption rang covering UV-visible wavelength (300-800 nm) and induce the increase of the film water contact angle from 40 degrees to 74 degrees, which contributes to the film shape stability. Furthermore, compared to the TiO2 nanoparticle-incorporated film, the antibacterial ability of Au-TiO2/sodium alginate composite film is improved approximately by 60% and 50% against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), respectively, in light conditions. The antibacterial property of the film arises from the increased production of reactive oxygen species (ROS) induced by the surface plasmonic resonance of Au nanoparticles. The degradable and antibacterial properties render the composite film of great application potential in food packaging industry.
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