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Tea Tree Oil Microemulsion-Gel-Strengthened Soy Protein Isolate Composite Films: A Multifunctional Active Packaging

Minghang Zhao1, Yulu Xie2, Pengbo Wang2

  • 1SDU-ANU Joint Science College, Shandong University (Weihai), Weihai 264209, China.

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PubMed
Summary
This summary is machine-generated.

This study developed stable soy protein isolate (SPI) composite films with tea tree oil microemulsions (TME) for active food packaging. These films offer sustained antioxidant release and antibacterial properties, improving food preservation.

Keywords:
active packaginggel filmmechanical propertiessoy protein isolatesustained releasetea tree oil microemulsion

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Area of Science:

  • Food Science and Technology
  • Materials Science
  • Biotechnology

Background:

  • Developing stable essential oil delivery systems for active food packaging is challenging.
  • Soy protein isolate (SPI) is a potential biopolymer for packaging films.
  • Tea tree oil (TTO) possesses antioxidant and antimicrobial properties.

Purpose of the Study:

  • To develop a multi-functional SPI-based composite gel film incorporating TME using a microemulsion-in-gel approach.
  • To evaluate the physicochemical stability of TME and the properties of the resulting composite films.
  • To assess the sustained antioxidant and antibacterial activities of the developed films for active packaging applications.

Main Methods:

  • Optimization of tea tree oil microemulsion (TME) using pseudo-ternary phase diagrams.
  • Fabrication of TME-SPI composite gel films via solution casting and gelation.
  • Characterization of film properties: opacity, elongation at break, water solubility, water vapor barrier.
  • Evaluation of antioxidant activity using DPPH assay.
  • Assessment of antibacterial activity against Staphylococcus aureus.

Main Results:

  • Optimized TME showed excellent physicochemical stability with droplet size 10-13 nm and PDI < 0.2 under various stress conditions.
  • TME incorporation significantly improved film opacity (2.5x), elongation at break (3x), water solubility, and water vapor barrier.
  • The 2% TME-SPI film demonstrated sustained antioxidant activity, retaining >50% DPPH scavenging activity after 72h.
  • Composite films exhibited concentration-dependent antibacterial activity, with 3% TME-SPI achieving 82% inhibition against S. aureus.

Conclusions:

  • The microemulsion-in-gel approach is effective for creating SPI-based films with enhanced properties and sustained antioxidant release.
  • The developed composite films offer light-barrier characteristics, adjustable moisture resistance, improved flexibility, and extended antioxidant release.
  • These SPI-TME composite films show significant potential for next-generation active food packaging due to their antioxidant and antibacterial functionalities.