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Zn2+ ions cross-linking sodium alginate encapsulated bacterial cellulose/ZnO composite film for antibacterial application

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Abstract

To realize the biocompatibility, mechanical strength, and sustained antibacterial properties of medical materials, it is feasible to introduce antibacterial material components into biomass matrix to prepare medical materials. Herein, zinc oxide (ZnO) was in-situ synthesized in bacterial cellulose (BC) dispersion and filtered into a film, and the BC/ZnO composite film was further immersed in sodium alginate (Alg) solution to construct the second layer structure. The microstructure, mechanical strength, and antibacterial properties of the composite films were investigated systematically. The tensile strength of the BC/ZnO/CAlg sample was achieved at 16.5 ± 2.4 MPa, much higher than that of the Zn2+ crosslinked CAlg film of 11.5 ± 1.2 MPa. The Zn2+ cross-linked Alg in the outer layer and the BC/ZnO composite film in the inner layer combined to create a synergistic effect. This secondary structure design ensures good hydrophilicity and hygroscopicity of the material which enables the sustained-release migration of Zn2+ from the inner layer to the outer layer. Finally, the BC/ZnO/CAlg composite film possesses excellent antibacterial performance against Staphylococcus aureus and Escherichia coli. In addition, this work systematically expounds on the antibacterial and slow-release mechanism of secondary structure composite membranes. The results will provide a database and theoretical reference for applying BC/ZnO/CAlg composite membranes in the medical field.

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Funding

This study was funded by the National Natural Science Foundation of China (51903198), Key Research and Development Program of Shaanxi (No. S2022-YF-YBNY-0187), Scientific Research Program Funded by Shaanxi Provincial Education Department (20JY025), Natural Science Basic Research Program of Shaanxi (No. 2022JQ-775), Health Scientific Research Project of Shaanxi Province (No.2022E020), Young Talents Fund of Association for Science and Technology in Shaanxi (No. SWYY202210), 2021 China National Textile and Apparel Council (CNTAC) Science and Technology Guidance Program (2021007), 2023 Graduate Innovation Fund Project of Xi’an Engineering University (chx2022030).

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BS, TZ and KY carried out the experiment as well as the test characterization. GT and YD provided assistance in conceiving experiments and analyzing data. Jianhua Ma conceived the idea and designed the experiments. All the authors have approved the final version of the manuscript.

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Correspondence to Jianhua Ma.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Song, B., Zhang, T., Yang, K. et al. Zn2+ ions cross-linking sodium alginate encapsulated bacterial cellulose/ZnO composite film for antibacterial application. Cellulose 30, 7853–7864 (2023). https://doi.org/10.1007/s10570-023-05371-w

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  • DOI: https://doi.org/10.1007/s10570-023-05371-w

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