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<p>Conventional modified atmosphere packaging (MAP) materials often suffer from limited antibacterial activity and poor degradability. In this study, an antibacterial nanocomposite polydopamine-functionalized montmorillonite/AgNPs/TiO₂ (PMMT/AgNPs/TiO₂) was synthesized via an in-situ method and incorporated into biodegradable PBTF/PBAT matrices to fabricate PBTF/PBAT/PMMT/AgNPs/TiO₂ (ATPPP) composite films using a blade-coating technique. Results showed that the 2.0% ATPPP film exhibited prominent antibacterial activity against <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>, with inhibition rates reaching 99.8% and 99.9%, respectively. In addition, the ATPPP composite film maintained favorable gas-modifying performance. Its maximum CO₂/O₂ separation factor reached 9.24, which was higher by 1.1 than that of the 2% PPP composite film. Moreover, it reached 97.42% degradation in alkaline solution. In the strawberry preservation experiment, after 12&#xa0;days of storage, the strawberries packaged in the 2% ATPPP film retained a water content of 95.1%, while showing a slight pH increase of 3.4% and a relative electrical conductivity of 7.55%. This work provides a feasible strategy for developing high-performance, biodegradable, and antibacterial MAP materials for food preservation.</p> Graphical Abstract <p></p>

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Enhancing the Antibacterial Activity and Barrier Properties of Biodegradable Modified Atmosphere Films Through Montmorillonite@Polydopamine/Silver/TiO₂ Nanocomposites for Food Preservation

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Hui Chang,
  • Can He,
  • Jia Sha,
  • Liang Zhu,
  • Kaijun Xiao

摘要

Conventional modified atmosphere packaging (MAP) materials often suffer from limited antibacterial activity and poor degradability. In this study, an antibacterial nanocomposite polydopamine-functionalized montmorillonite/AgNPs/TiO₂ (PMMT/AgNPs/TiO₂) was synthesized via an in-situ method and incorporated into biodegradable PBTF/PBAT matrices to fabricate PBTF/PBAT/PMMT/AgNPs/TiO₂ (ATPPP) composite films using a blade-coating technique. Results showed that the 2.0% ATPPP film exhibited prominent antibacterial activity against Escherichia coli and Staphylococcus aureus, with inhibition rates reaching 99.8% and 99.9%, respectively. In addition, the ATPPP composite film maintained favorable gas-modifying performance. Its maximum CO₂/O₂ separation factor reached 9.24, which was higher by 1.1 than that of the 2% PPP composite film. Moreover, it reached 97.42% degradation in alkaline solution. In the strawberry preservation experiment, after 12 days of storage, the strawberries packaged in the 2% ATPPP film retained a water content of 95.1%, while showing a slight pH increase of 3.4% and a relative electrical conductivity of 7.55%. This work provides a feasible strategy for developing high-performance, biodegradable, and antibacterial MAP materials for food preservation.

Graphical Abstract