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<p>In the present study, biopolymer nanocomposites based on carboxymethyl cellulose (CMC) with silk sericin (SS) based silver nanoparticles (AgNPs) were developed using a solution casting technique. <i>Bombyx mori</i> silk sericin, a natural by-product of the silk industry, served as a bio template for the green synthesis of AgNPs. The characteristic surface Plasmon resonance (SPR) peak observed within 400–450&#xa0;nm range in the UV-Vis absorption spectra confirmed AgNPs formation. X-ray diffraction (XRD) studies indicated an FCC crystalline structure. The transmission electron microscopy (TEM) demonstrated polydisperse nanoparticles with sizes ranging between 5 and 35&#xa0;nm. The optical analysis of the nanocomposites indicated a decline in bandgap energy from 4.93 to 4.35&#xa0;eV with increasing AgNPs content, along with significantly enhanced UV shielding properties. Thermogravimetric measurements demonstrated enhanced thermal stability. Mechanical testing showed improved mechanical characteristics of the films by the addition of AgNPs, particularly at lower concentrations. The nanocomposites exhibited effective antibacterial activity against both Gram-positive and Gram-negative bacterial strains. These multifunctional features suggest that the developed CMC/SS-AgNPs nanocomposite films hold significant promise for food packaging and UV-shielding applications.</p>

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Fabrication and Characterization of CMC/SS-AgNPs Nanocomposites for UV-Shielding and Food Packaging Applications

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Lavita J. Martis,
  • S. Thripthi,
  • M. A. Arpitha,
  • B. N. Rakesh,
  • Y. Sangappa

摘要

In the present study, biopolymer nanocomposites based on carboxymethyl cellulose (CMC) with silk sericin (SS) based silver nanoparticles (AgNPs) were developed using a solution casting technique. Bombyx mori silk sericin, a natural by-product of the silk industry, served as a bio template for the green synthesis of AgNPs. The characteristic surface Plasmon resonance (SPR) peak observed within 400–450 nm range in the UV-Vis absorption spectra confirmed AgNPs formation. X-ray diffraction (XRD) studies indicated an FCC crystalline structure. The transmission electron microscopy (TEM) demonstrated polydisperse nanoparticles with sizes ranging between 5 and 35 nm. The optical analysis of the nanocomposites indicated a decline in bandgap energy from 4.93 to 4.35 eV with increasing AgNPs content, along with significantly enhanced UV shielding properties. Thermogravimetric measurements demonstrated enhanced thermal stability. Mechanical testing showed improved mechanical characteristics of the films by the addition of AgNPs, particularly at lower concentrations. The nanocomposites exhibited effective antibacterial activity against both Gram-positive and Gram-negative bacterial strains. These multifunctional features suggest that the developed CMC/SS-AgNPs nanocomposite films hold significant promise for food packaging and UV-shielding applications.