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<p>With the increased demand for food safety, how to detect food spoilage in real time is widely researched. A intelligent film of konjac glucomannan (KGM)/sodium alginate (SA)/carboxylated cellulose nanofibers (CCN) with varying concentrations of Roselle extracts (REs) (KSC/REs) were prepared in this work. The physicochemical properties, functional properties and practical applications of the KSC/REs film were systematically evaluated. Specifically, FT-IR, XRD, XPS and SEM analyses indicate that rare earth elements (REs) have successfully incorporated into the KSC film via hydrogen bonding. In addition, REs enhance the film's thickness, tensile strength, antioxidant activity and thermal stability through hydrogen bonding interactions. As the concentration of REs increased, the film's transmittance (TS) rose by 357%, while its water vapour permeability (WVP) decreased by approximately 44%. The KSC/REs films with varying concentrations of REs could exhibit pH-responsiveness in different pH environments. Notably, the KSC/REs films could detect the metamorphosis of chicken, pork, and shrimp through color change and the results became more pronounced with the concentration of REs. Through the membrane's ΔE value, it was found that at different pH levels, the ΔE value of the KSC/RES-12 membrane was generally around 10 greater than that of the KSC/RES-3 membrane. This indicates that increased concentrations of REs result in more pronounced colour changes in the membrane. Briefly, a bio-based intelligent packaging film was developed in this work, demonstrating potential applications in meat freshness monitoring.</p>

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pH-sensitive intelligent film for visual freshness monitoring of meat and aquatic products

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Jing Yang,
  • Qiying Wang,
  • Zitian Liu,
  • Ligang Lin,
  • Fengling Tang,
  • Meina Xu,
  • Xu Yang,
  • Qi Cheng,
  • Wensong Ma,
  • Huiyang Shang,
  • Hao Wu

摘要

With the increased demand for food safety, how to detect food spoilage in real time is widely researched. A intelligent film of konjac glucomannan (KGM)/sodium alginate (SA)/carboxylated cellulose nanofibers (CCN) with varying concentrations of Roselle extracts (REs) (KSC/REs) were prepared in this work. The physicochemical properties, functional properties and practical applications of the KSC/REs film were systematically evaluated. Specifically, FT-IR, XRD, XPS and SEM analyses indicate that rare earth elements (REs) have successfully incorporated into the KSC film via hydrogen bonding. In addition, REs enhance the film's thickness, tensile strength, antioxidant activity and thermal stability through hydrogen bonding interactions. As the concentration of REs increased, the film's transmittance (TS) rose by 357%, while its water vapour permeability (WVP) decreased by approximately 44%. The KSC/REs films with varying concentrations of REs could exhibit pH-responsiveness in different pH environments. Notably, the KSC/REs films could detect the metamorphosis of chicken, pork, and shrimp through color change and the results became more pronounced with the concentration of REs. Through the membrane's ΔE value, it was found that at different pH levels, the ΔE value of the KSC/RES-12 membrane was generally around 10 greater than that of the KSC/RES-3 membrane. This indicates that increased concentrations of REs result in more pronounced colour changes in the membrane. Briefly, a bio-based intelligent packaging film was developed in this work, demonstrating potential applications in meat freshness monitoring.