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<p>The copper nanoparticle-implanted nanocellulose (Cu@NC) fibrils and honey (Hon)-incorporated chitosan/polyvinyl alcohol (CS/PVA) matrix-based nanocomposite films were fabricated for food packaging applications. Self-synthesized Cu@NC was used as a nanofiller that fortifies the food packaging film, following a “hit two targets with one arrow” approach. The effects of Cu@NC and honey on various properties were investigated. The composite film exhibited exceptional UV barrier properties (up to 500&#xa0;nm), enhanced hydrophobicity (86 ± 1.1°), extended lifespan, and biodegradability, indicating it as a “low-impact” material. Notably, the tensile strength of the nanocomposite film enhanced to 4.63 ± 0.04&#xa0;MPa, water vapor transmission reduced to 55.68 ± 0.69 gm<sup>−2</sup>&#xa0;h<sup>−1</sup>, and the solubility decreased to 65.72 ± 0.83% upon adding Cu@NC, making the films more effective for food preservation. The nanocomposite film exhibited strong antimicrobial activity against Gram-positive bacteria, <i>Staphylococcus aureus</i> (MRSA), Gram-negative bacteria, <i>Escherichia coli</i>, and the fungal strain, <i>Candida albicans</i>. The overall migration values of Cu@NC2 in different simulants were lower than the permissible limit (10&#xa0;mg/dm<sup>2</sup>). When applied to strawberries, the films significantly minimized weight loss and prevented microbial contamination under storage conditions (25&#xa0;°C and 50 ± 5% RH). With their superior mechanical properties, antimicrobial efficacy, and flexibility, the Cu@NC and Hon-infused CS/PVA films are promising for fruit storage and transportation.</p>

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Low-Impact Nanocomposite Packaging: Cu@Nanocellulose-Fortified Chitosan/PVA/Honey Bioactive Film for Strawberry Preservation

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Rajendra Bahadur G. C.,
  • Ganesh Prasad Awasthi,
  • Khim Prasad Panthi,
  • Dikpal Kumar Shahi,
  • Khagendra Prasad Bohara,
  • Motee Lal Sharma,
  • Arjun Prasad Tiwari,
  • Surya Kant Kalauni,
  • Changho Yu,
  • Wei Li,
  • Mahesh Kumar Joshi

摘要

The copper nanoparticle-implanted nanocellulose (Cu@NC) fibrils and honey (Hon)-incorporated chitosan/polyvinyl alcohol (CS/PVA) matrix-based nanocomposite films were fabricated for food packaging applications. Self-synthesized Cu@NC was used as a nanofiller that fortifies the food packaging film, following a “hit two targets with one arrow” approach. The effects of Cu@NC and honey on various properties were investigated. The composite film exhibited exceptional UV barrier properties (up to 500 nm), enhanced hydrophobicity (86 ± 1.1°), extended lifespan, and biodegradability, indicating it as a “low-impact” material. Notably, the tensile strength of the nanocomposite film enhanced to 4.63 ± 0.04 MPa, water vapor transmission reduced to 55.68 ± 0.69 gm−2 h−1, and the solubility decreased to 65.72 ± 0.83% upon adding Cu@NC, making the films more effective for food preservation. The nanocomposite film exhibited strong antimicrobial activity against Gram-positive bacteria, Staphylococcus aureus (MRSA), Gram-negative bacteria, Escherichia coli, and the fungal strain, Candida albicans. The overall migration values of Cu@NC2 in different simulants were lower than the permissible limit (10 mg/dm2). When applied to strawberries, the films significantly minimized weight loss and prevented microbial contamination under storage conditions (25 °C and 50 ± 5% RH). With their superior mechanical properties, antimicrobial efficacy, and flexibility, the Cu@NC and Hon-infused CS/PVA films are promising for fruit storage and transportation.