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Related Concept Videos

Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Polylactide Modified with ZnO and Raspberry Leaf Extract as Active Food Packaging.

Magdalena Zdanowicz1, Małgorzata Mizielińska1, Wojciech Jankowski1

  • 1Center of Bioimmobilisation and Innovative Packaging Materials, Faculty of Food Sciences and Fisheries, West Pomeranian University of Technology in Szczecin, Janickiego 35, 71-270 Szczecin, Poland.

International Journal of Molecular Sciences
|May 13, 2026
PubMed
Summary

This study modified polylactide (PLA) packaging with zinc oxide nanoparticles and raspberry leaf extract. The enhanced PLA films showed improved mechanical, barrier, and antiviral properties, offering potential for advanced food packaging.

Keywords:
active packagingantiviralbiocompositesgel permeation chromatographynanoparticlespolylactideraspberry leafwaste management

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biotechnology

Background:

  • Conventional food packaging materials pose environmental challenges.
  • Development of biodegradable polymers like polylactide (PLA) is crucial.
  • Enhancing PLA properties for superior packaging applications is an active research area.

Purpose of the Study:

  • To create novel PLA-based packaging materials by incorporating zinc oxide nanoparticles (ZnO) and raspberry leaf extract (E).
  • To evaluate the physicochemical, mechanical, barrier, and antimicrobial properties of modified PLA films.
  • To investigate the impact of ZnO and E incorporation on PLA stability during processing.

Main Methods:

  • Solvent-free cast extrusion was used to prepare PLA films modified with ZnO, E, or a combination (EZnO).
  • Physicochemical characterization included GPC, SEM, FTIR, tensile tests, puncture tests, WVTR, OTR, UV-Vis spectroscopy, and water contact angle measurements.
  • Antimicrobial efficacy was assessed through antibacterial, antifungal, and antiviral assays.

Main Results:

  • Raspberry leaf extract (E) addition mitigated PLA degradation during hot melt processing.
  • PLA films with E exhibited the best mechanical properties (Tensile Strength ~50 MPa, Elongation at Break ~18%).
  • EZnO modification significantly improved oxygen barrier (up to 25%) and water vapor barrier (up to 28%) properties.
  • EZnO-modified PLA demonstrated enhanced antiviral activity, completely inactivating Φ6 bacteriophage.

Conclusions:

  • Incorporating raspberry leaf extract and zinc oxide nanoparticles into PLA can yield advanced packaging materials.
  • Modified PLA films offer improved mechanical strength, barrier properties, and significant antiviral efficacy.
  • These findings suggest potential for developing sustainable and functional food packaging solutions.