Abstract
We describe an effective method to create nanocomposites of silver nanoparticles that were stabilized by cellulose nanofibrils (CNF-AgNPs) that were then mixed with a starch matrix. The incorporation of CNF-AgNPs nanocomposites significantly enhanced the mechanical and antibacterial properties of hybrid films. The starch-based films with only 5.0 wt% CNF-AgNPs content exhibited superior mechanical properties in which the Young’s modulus increased from 80.3 to 381.5 MPa and tensile strength increased from 6.06 to 9.96 MPa at 50% RH. Taking advantage of the denser microstructure and strong interfibrillar networks, the nanocomposite film can resist more external tensile forces and show excellent barrier property and thermostability. Moreover, antibacterial analysis indicated that CNF-AgNPs/starch nanocomposite films exhibited strong bactericidal effects against representative both Escherichia coli and Staphylococcus aureus. The cell viability of 87.71% and clear morphologies of live cells implied good biocompatibility of nanocomposite films. The demonstrated characteristics of CNF-AgNPs/starch nanocomposite film verified its suitability as a sustainable material for food packaging.
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Acknowledgments
This research was financially supported by National Key R&D Program of China (2017YFB0307902), Natural Science Foundation of Guangdong Province (2019A1515010996) China Postdoctoral Science Foundation (2019TQ0100, BX20200134), and the Fundamental Research Funds for the Central Universities (2019MS085 and 2017YFB0307902).
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Yuan, T., Zeng, J., Wang, B. et al. Silver nanoparticles immobilized on cellulose nanofibrils for starch-based nanocomposites with high antibacterial, biocompatible, and mechanical properties. Cellulose 28, 855–869 (2021). https://doi.org/10.1007/s10570-020-03567-y
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DOI: https://doi.org/10.1007/s10570-020-03567-y