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Facile preparation of pH-responsive antimicrobial complex and cellulose nanofiber/PVA aerogels as controlled-release packaging for fresh pork

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Abstract

Intelligent controlled release technologies that rely on environmental changes to control the release rate of antimicrobial agents have attracted attention in the field of food preservation. In this paper, cinnamaldehyde (CN) was grafted onto chitosan (CS) to form a pH-responsive controlled-release complex, CS–CN, via the Schiff base reaction. Then, tempo oxidized cellulose nanofibers (CNF) and PVA were prepared as aerogels loaded with CS–CN with different pore parameters (PCNF@CN). Release experiments showed that acid triggered the release of CN and increased the release from 10.3 to 68.4% with increasing pH. In addition, PCNF@CN showed significant pH-responsive antimicrobial properties against Escherichia coli and Staphylococcus aureus. Utilizing the water absorption of the aerogel and triggering the release of CN, the shelf life of fresh meat could be delayed for 4 days. This study demonstrated the potential application of PCNF@CN aerogel in functional food preservation packaging.

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Acknowledgements

This work is supported by Fundamental Scientific Research Funds of Central Universities (JUSRP21115); Independent Research Project Funding Project of Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment Technology (FMZ201902); Postgraduate Research & Practice Innovation Program of Jiangsu Province (1072050205238200); Postgraduate Research & Practice Innovation Program of Jiangsu Province (1075212042230360).

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TH: investigation and writing of manuscript. FW: conceptualization and validation. LW: project administration, writing—review and editing. All authors reviewed and commented on manuscript.

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Correspondence to Liqiang Wang.

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Hou, T., Wang, F. & Wang, L. Facile preparation of pH-responsive antimicrobial complex and cellulose nanofiber/PVA aerogels as controlled-release packaging for fresh pork. Food Sci Biotechnol 33, 1871–1883 (2024). https://doi.org/10.1007/s10068-023-01487-8

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