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Active Polylactic Acid (PLA) Films Incorporating Almond Peel Extracts for Food Preservation.

Laia Martin-Perez1, Carolina Contreras1, Amparo Chiralt1

  • 1Institute of Food Engineering Food UPV, Universitat Politecnica de Valencia, Camino de Vera s/b, 46022 Valencia, Spain.

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Summary

Almond peel extracts enhance polylactic acid (PLA) films, reducing oxidation in foods like orange juice and sunflower oil. While not antimicrobial, these active packaging films show promise for food preservation by slowing degradation.

Keywords:
HFMmechanical and barrier propertiesorange juicephenolssunflower oil

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Area of Science:

  • Food Science
  • Materials Science
  • Agricultural Byproducts Valorization

Background:

  • Almond peel extracts possess antioxidant and antimicrobial properties due to phenolic compounds.
  • Subcritical water extraction is an effective method for obtaining bioactive compounds from plant materials.
  • Active packaging aims to extend food shelf-life by incorporating functional ingredients into packaging materials.

Purpose of the Study:

  • To develop active polylactic acid (PLA) films incorporating almond peel extracts for food preservation.
  • To characterize the physical, mechanical, barrier, optical, and thermal properties of the developed PLA-based films.
  • To evaluate the antioxidant and antimicrobial efficacy of the active films and their potential in extending the shelf-life of food products.

Main Methods:

  • Subcritical water extraction of almond peel at 160 and 180 °C.
  • Incorporation of almond peel extracts into PLA films (PLA-E160, PLA-E180).
  • Characterization of film properties (microstructure, mechanical, barrier, optical, thermal).
  • Evaluation of phenolic compound and HFM release into food simulants.
  • Shelf-life studies on packaged orange juice and sunflower oil.

Main Results:

  • PLA films with almond peel extracts showed altered microstructure, reduced mechanical resistance, increased stretchability, and darker appearance.
  • Phenolic compound and HFM release was higher in 95% ethanol simulant.
  • Active films significantly reduced oxidative degradation in orange juice and sunflower oil.
  • No significant antimicrobial activity was observed in vitro or in vivo.

Conclusions:

  • Almond peel extracts can be incorporated into PLA films to create active packaging with antioxidant properties.
  • These active PLA films effectively reduce oxidative deterioration in susceptible food products.
  • Further research may be needed to enhance the release of active compounds for antimicrobial efficacy.