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<p>Using a solution casting technique, electron beam-irradiated polymer nanocomposite films based on polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) were successfully produced and reinforced with silver nanoparticles (AgNPs) mediated by tannic acid (TA). Tannic acid acted as a stabilizing and reducing agent at the same time in this green synthesis method, allowing well-dispersed AgNPs to develop within the polymeric matrix. To improve interfacial interactions and overall performance, the produced films were then subjected to an electron beam irradiation dose of 25&#xa0;kGy as an optimum dose. FT-IR, XRD, UV/Vis, TEM, and SEM techniques have been used to investigate structural, optical, and morphological characteristics. The development of a face-centered cubic silver phase is verified by the XRD characterization, indicating that tannic acid reduction was successful in generating silver nanoparticles. The majority of the nanoparticles were spherical, with an average size of 12.5&#xa0;nm, according to TEM studies. The addition of TA-Ag NPs and electron beam irradiation treatment significantly improved the tensile characteristics of the nanocomposite films, as shown by mechanical testing. This improvement was ascribed to better intermolecular contacts and irradiation-induced crosslinking. The thermal analysis results indicate that the PVA/CMC/TA-Ag nanocomposite films have enhanced thermal stability compared with pure polymeric film. This study investigated the antimicrobial activity of PVA/CMC/TA-Ag NPs films against pathogenic microbes of <i>Staphylococcus aureus</i>, MRSA, <i>Proteus mirabilis</i>,<i> Proteus vulgaris</i>, and <i>Candida albicans</i>. The PVA/CMC films containing 10 mL of TA-Ag NPs were highly effective against <i>S. aureus</i> and <i>P. mirabilis</i> with inhibition zone diameters of 25.02 ± 0.45 and 25.80 ± 1.23&#xa0;mm, respectively. At 500&#xa0;µg/mL, the PVA/CMC/TA-Ag NPs demonstrated a noteworthy antioxidant activity of 56.86 ± 3.54%. These findings of combination electron beam-induced crosslinking of PVA/CMC films with tannic acid-mediated green synthesis of silver nanoparticles create a multifunctional nanocomposite with improved mechanical and thermal performance, enhanced structural stability, significant antioxidant activity, and broad-spectrum antimicrobial efficacy make them appropriate for several applications such as in packaging and medical settings.</p>

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Development of Antimicrobial and Antioxidant Properties of Electron Beam–Irradiated Polyvinyl Alcohol/Carboxymethylcellulose Blend Using Tannic Acid-Mediated Nanosilver

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Mohamad Bekhit,
  • Khaled F. El-Nemr,
  • Yasser H. Gad,
  • Rasha M. Fathy,
  • Eman M. Hamdy

摘要

Using a solution casting technique, electron beam-irradiated polymer nanocomposite films based on polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) were successfully produced and reinforced with silver nanoparticles (AgNPs) mediated by tannic acid (TA). Tannic acid acted as a stabilizing and reducing agent at the same time in this green synthesis method, allowing well-dispersed AgNPs to develop within the polymeric matrix. To improve interfacial interactions and overall performance, the produced films were then subjected to an electron beam irradiation dose of 25 kGy as an optimum dose. FT-IR, XRD, UV/Vis, TEM, and SEM techniques have been used to investigate structural, optical, and morphological characteristics. The development of a face-centered cubic silver phase is verified by the XRD characterization, indicating that tannic acid reduction was successful in generating silver nanoparticles. The majority of the nanoparticles were spherical, with an average size of 12.5 nm, according to TEM studies. The addition of TA-Ag NPs and electron beam irradiation treatment significantly improved the tensile characteristics of the nanocomposite films, as shown by mechanical testing. This improvement was ascribed to better intermolecular contacts and irradiation-induced crosslinking. The thermal analysis results indicate that the PVA/CMC/TA-Ag nanocomposite films have enhanced thermal stability compared with pure polymeric film. This study investigated the antimicrobial activity of PVA/CMC/TA-Ag NPs films against pathogenic microbes of Staphylococcus aureus, MRSA, Proteus mirabilis, Proteus vulgaris, and Candida albicans. The PVA/CMC films containing 10 mL of TA-Ag NPs were highly effective against S. aureus and P. mirabilis with inhibition zone diameters of 25.02 ± 0.45 and 25.80 ± 1.23 mm, respectively. At 500 µg/mL, the PVA/CMC/TA-Ag NPs demonstrated a noteworthy antioxidant activity of 56.86 ± 3.54%. These findings of combination electron beam-induced crosslinking of PVA/CMC films with tannic acid-mediated green synthesis of silver nanoparticles create a multifunctional nanocomposite with improved mechanical and thermal performance, enhanced structural stability, significant antioxidant activity, and broad-spectrum antimicrobial efficacy make them appropriate for several applications such as in packaging and medical settings.