Silver nanoparticles immobilized on cellulose nanofibrils for starch-based nanocomposites with high antibacterial, bioco
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ORIGINAL RESEARCH
Silver nanoparticles immobilized on cellulose nanofibrils for starch-based nanocomposites with high antibacterial, biocompatible, and mechanical properties Tianzhong Yuan . Jinsong Zeng . Bin Wang . Zheng Cheng . Wenhua Gao . Jun Xu . Kefu Chen
Received: 29 August 2020 / Revised: 26 October 2020 / Accepted: 29 October 2020 Ó Springer Nature B.V. 2020
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. Keywords Cellulose nanofibrils Silver nanoparticles Mechanical properties Antibacterial activity
Electronic supplementary material The online version contains supplementary material available at https://doi.org/10. 1007/s10570-020-03567-y. T. Yuan J. Zeng (&) B. Wang (&) Z. Cheng W. Gao J. Xu K. Chen State Key Laboratory of Pulp and Paper Engineering, Plant Fiber Research Center, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China e-mail: [email protected] B. Wang e-mail: [email protected] T. Yuan J. Zeng B. Wang Z. Cheng W. Gao J. Xu K. Chen Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, South China University of Technology, Guangzhou 510640, China
Introduction The development of food packing materials has gained interest in the material science field. There is an increasing tendency for the production and application of biodegradable polymeric materials for minimizing environmental impact. Starch is a widely available renewable, completely biodegradable, nontoxic, and low-cost polysaccharide produced by photosynthesis process during plant growth (Lengowski et al. 2020; Merino et al. 2019; Olkku and Rha 1978; Park et al. 2003; Ratnayake and Jackson 2009). Due to the inherent characteristics of the edible/biodegradable
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Cellulose
and oxygen barrier properties, starch-based fi
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