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<p>In this study, the solution casting method was used for casein-based polymer films synthesis. For this purpose, different amounts of 0.1&#xa0;M silver nitrate were added to casein (Cas) solution to obtain 1% Ag:Cas, 2% Ag:Cas, 3%Ag:Cas, 4% Ag:Cas, and 5% Ag:Cas films. Silver particles were formed in the Casein-mediated solution by temperature-induced reduction. The X-ray diffraction analysis revealed the emergence of two distinct peaks for composite films with compositions below 3% Ag. According to Scanning Electron Microscopy (SEM) images, an optimal homogeneity of Ag particles on the film surface was observed for 2% Ag:Cas composition. The mechanical tests revealed a maximum increase of the tensile strength for the 2% Ag:Cas film compared to the pure casein film. The measured absorption coefficient exhibited a proportional increase with Ag composition of the films. The thermal analysis demonstrated that the thermal resistance is enhanced in 1% Ag:Cas and 3%Ag:Cas films. The water vapor permeability of the Ag:Cas films is reduced in comparison to pure casein film. In addition, all Ag:Cas films demonstrated an antibacterial activity against <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>. Therefore, the fabricated Ag:Cas films can be suitable for antibacterial coating applications.</p>

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Silver-casein composite films: towards a new antibacterial coating

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Nedjma ElHouda Hadj Kaddour,
  • Nadia Iles,
  • Suzan Biran Ay,
  • Hakim Blekhalfa,
  • Abdelkader Khalil Belalem,
  • Fouaz Lekoui,
  • Khaldoun Bachari

摘要

In this study, the solution casting method was used for casein-based polymer films synthesis. For this purpose, different amounts of 0.1 M silver nitrate were added to casein (Cas) solution to obtain 1% Ag:Cas, 2% Ag:Cas, 3%Ag:Cas, 4% Ag:Cas, and 5% Ag:Cas films. Silver particles were formed in the Casein-mediated solution by temperature-induced reduction. The X-ray diffraction analysis revealed the emergence of two distinct peaks for composite films with compositions below 3% Ag. According to Scanning Electron Microscopy (SEM) images, an optimal homogeneity of Ag particles on the film surface was observed for 2% Ag:Cas composition. The mechanical tests revealed a maximum increase of the tensile strength for the 2% Ag:Cas film compared to the pure casein film. The measured absorption coefficient exhibited a proportional increase with Ag composition of the films. The thermal analysis demonstrated that the thermal resistance is enhanced in 1% Ag:Cas and 3%Ag:Cas films. The water vapor permeability of the Ag:Cas films is reduced in comparison to pure casein film. In addition, all Ag:Cas films demonstrated an antibacterial activity against Escherichia coli and Staphylococcus aureus. Therefore, the fabricated Ag:Cas films can be suitable for antibacterial coating applications.