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Biodegradable Antioxidant Composites with Almond Skin Powder.

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Agri-food waste almond skin (AS) powder enhances polylactic acid (PLA) and polyvinyl alcohol (PVA) composite films for food packaging. These films exhibit improved UV blocking, oxygen barrier, and antioxidant properties, reducing oil oxidation.

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Area of Science:

  • Materials Science
  • Food Science
  • Polymer Science

Background:

  • Agri-food waste, such as almond skin (AS), possesses valuable components like polysaccharides, proteins, and phenolic compounds.
  • These components make AS a promising candidate for developing sustainable composite films for food packaging applications.
  • Traditional food packaging often relies on synthetic materials with environmental concerns, driving the search for biodegradable alternatives.

Purpose of the Study:

  • To investigate the potential of incorporating defatted almond skin (AS) powder into polylactic acid (PLA) and polyvinyl alcohol (PVA) matrices for food packaging films.
  • To evaluate the effects of varying AS content on the structural, barrier, and antioxidant properties of the composite films.
  • To assess the performance of these novel films in preserving packaged unsaturated oil.

Main Methods:

  • Composite films were fabricated using melt blending and compression molding with amorphous PLA or partially acetylated PVA.
  • Defatted AS powder was incorporated at different weight percentages (0, 5, 10, 15 wt.%).
  • The films' properties, including oxygen barrier, water vapor permeability, UV blocking, and antioxidant activity, were analyzed. Oil preservation was tested using sunflower oil in single-dose bags.

Main Results:

  • Almond skin powder integrated better into the polar PVA matrix, influencing its thermal properties.
  • The composite films exhibited enhanced UV light blocking and improved oxygen barrier properties.
  • Water vapor permeability increased in PLA films but decreased in PVA films with AS addition. Antioxidant properties were imparted to both matrices, delaying oil oxidation.

Conclusions:

  • Defatted almond skin powder is a viable filler for creating functional composite films from PLA and PVA.
  • The incorporation of AS significantly improves the UV-blocking and oxygen barrier characteristics of the packaging materials.
  • These AS-based composite films demonstrate potential for sustainable food packaging, offering antioxidant benefits and extending the shelf-life of packaged oils.