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In-situ synthesis and immobilization of silver nanoparticles on microfibrillated cellulose for long-term antibacterial applications

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Abstract

Synthesis of nanocomposites containing silver nanoparticles (AgNPs) has drawn growing interest owing to their antimicrobial activity and tuneable physicochemical properties. In this study, we report the surface modification of microfibrillated cellulose (MFC) with bio-inspired polydopamine (PDA) followed by in-situ growth and immobilization of AgNPs. The resultant AgNPs-PDA-MFC nanocomposites were characterized by UV–Vis spectrophotometry, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction. The results showed that crystalline face-centered cubic AgNPs with a mean diameter of 19.1 nm were randomly and firmly immobilized on MFC. The attenuated total reflection Fourier transform infrared analysis results confirmed the formation of AgNPs, and the content of silver in AgNPs-PDA-MFC was determined by thermogravimetry. The aqueous suspension of AgNPs-PDA-MFC was stable during 30 days of storage. Antibacterial activity of the AgNPs-PDA-MFC nanocomposites was evaluated with Escherichia coli and Staphylococcus aureus. Importantly, AgNPs-PDA-MFC exhibited excellent long-term antibacterial activity. This was ascribed to the extremely slow but sustained release of silver from the AgNPs-PDA-MFC (0.56% in 14 days). Furthermore, the application of AgNPs-PDA-MFC as coating and filling agents was preliminarily evaluated. This study suggests that the AgNPs-PDA-MFC nanocomposites with long-term antibacterial performance provide a promising solution for fighting against pathogenic bacteria.

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Acknowledgments

The authors would like to express gratitude to Dr. Eleanor M. Brown for her valuable assistance in revising this article, and to Ms. Fang Wang for TGA tests. This work was supported by the Key Scientific Research Projects of Henan Province, China (Grant Number 21A430034); and National Natural Science Foundation of China (Grant Numbers U2004211, 51603191, 51673177).

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Correspondence to Jie Liu or Keyong Tang.

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10570_2021_3941_MOESM1_ESM.docx

Supplementary file1 The SEM image of MFC, digital photos of Kraft papers and carrageenan-based films, inhibition zones of samples and positive control (levofloxacin) against E. coli, S. aureus and P. aeruginosa, and ZOI values were shown in supporting information. (DOCX 5069 kb)

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Ma, Z., Liu, J., Shen, G. et al. In-situ synthesis and immobilization of silver nanoparticles on microfibrillated cellulose for long-term antibacterial applications. Cellulose 28, 6287–6303 (2021). https://doi.org/10.1007/s10570-021-03941-4

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  • DOI: https://doi.org/10.1007/s10570-021-03941-4

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