期刊
FOOD PACKAGING AND SHELF LIFE
卷 31, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.fpsl.2021.100800
关键词
Antibacterial activity; Green grape; Heat-sealed packaging; Silver nanoparticles; Soluble soybean polysaccharide
资金
- Department of Science and Technology of Henan Province [172102410022]
- National Natural Science Foundation of China [U2004211]
A study was conducted to fabricate antibacterial soluble soybean polysaccharide (SSPS)-based nanocomposite films containing silver nanoparticles (AgNPs) for food packaging applications. The presence of AgNPs improved the thermal stability and UV light barrier property of the SSPS films, showing excellent inhibition activity against different types of bacteria and extending the shelf life of green grapes in heat-sealed packaging pouches.
In the present study, antibacterial soluble soybean polysaccharide (SSPS)-based nanocomposite films containing in-situ generated silver nanoparticles (AgNPs) were fabricated for food packaging applications. SSPS first reduced silver ions to AgNPs in aqueous solution, and then immobilized these nanoparticles via film casting and drying methods. The formation and homogeneously distribution of AgNPs in glycerol-plasticized SSPS films were confirmed by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy. The structure and properties of the SSPS/AgNPs films were characterized via ultraviolet-visible spectroscopy, scanning electron microscopy, thermogravimetry, mechanical testing, water vapor permeability and optical properties measurements. The presence of AgNPs improved the thermal stability and ultra-violet light barrier property of the SSPS films. Antibacterial tests revealed excellent inhibition activity of the SSPS/AgNPs films against different types of bacteria (Escherichia coli and Staphylococcus aureus). The SSPS/AgNPs films could be processed into heat-sealed packaging pouches to extend the shelf life of green grapes.
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