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<p>We report the incorporation of carbon dots (CDs) as a reinforcing agent in chitosan (CS)/polyvinyl alcohol (PVA) composite films for sustainable food packaging applications. CDs were synthesized from ascorbic acid via a hydrothermal method and incorporated into CS/PVA films using a simple solution casting approach. Structural and optical characterization was carried out by UV–visible spectroscopy, while surface wettability was evaluated through contact angle analysis. The CS/PVA/CDs films exhibited a higher contact angle (86°), indicating reduced wettability and enhanced hydrophobicity compared to CS/PVA films. Biodegradability testing revealed weight losses of 70–81% for CS/PVA/CDs films and about 87% for CS/PVA films within 30 days of soil burial. Mechanical testing showed that the addition of CDs improved the tensile strength to 50&#xa0;MPa. Furthermore, the CS/PVA/CDs films demonstrated significant antibacterial activity, with inhibition zones against <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>. These findings highlight the potential of CS/PVA/CDs composites as biodegradable, mechanically durable, and antimicrobial food packaging materials.</p>

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Sustainable advanced food packaging applications of chitosan/polyvinly alcohol based carbon dots

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Zahida Begum,
  • Rizwan Ahmed Malik,
  • Hussein Alrobei,
  • Muhammad Atiq Ur Rehman

摘要

We report the incorporation of carbon dots (CDs) as a reinforcing agent in chitosan (CS)/polyvinyl alcohol (PVA) composite films for sustainable food packaging applications. CDs were synthesized from ascorbic acid via a hydrothermal method and incorporated into CS/PVA films using a simple solution casting approach. Structural and optical characterization was carried out by UV–visible spectroscopy, while surface wettability was evaluated through contact angle analysis. The CS/PVA/CDs films exhibited a higher contact angle (86°), indicating reduced wettability and enhanced hydrophobicity compared to CS/PVA films. Biodegradability testing revealed weight losses of 70–81% for CS/PVA/CDs films and about 87% for CS/PVA films within 30 days of soil burial. Mechanical testing showed that the addition of CDs improved the tensile strength to 50 MPa. Furthermore, the CS/PVA/CDs films demonstrated significant antibacterial activity, with inhibition zones against Staphylococcus aureus and Escherichia coli. These findings highlight the potential of CS/PVA/CDs composites as biodegradable, mechanically durable, and antimicrobial food packaging materials.