Biodegradable xylan/polyhedral oligomeric silsesquioxane based composite films for fruit preservation

Area of Science:

• Materials Science
• Food Science
• Biotechnology

Background:

• Developing sustainable and functional food packaging is crucial for reducing waste and extending shelf life.
• Conventional packaging often lacks biodegradability and controlled-release properties for active compounds.
• Xylan and polyhedral oligomeric silsesquioxane (POSS) offer potential as components for advanced packaging materials.

Purpose of the Study:

• To develop a novel biodegradable composite film based on xylan and POSS for food preservation.
• To incorporate and control the release of thymol, a natural antimicrobial agent, within the film matrix.
• To evaluate the film's mechanical properties, safety, and efficacy in extending the shelf life of fruits.

Main Methods:

• Fabrication of the composite film via cross-linking sodium polyacrylate POSS with xylan molecules.
• Assessment of mechanical properties (strength, elongation) and thermal stability.
• Migration tests to ensure food contact safety and controlled release studies of thymol.
• Application of the film to winter jujube and strawberries to evaluate preservation effects.

Main Results:

• The xylan/POSS composite film exhibited excellent mechanical strength (11.56 MPa) and elongation (489.67%).
• Migration tests confirmed the film's safety for food contact, with contaminant levels well below regulatory limits.
• The film demonstrated significant antioxidant and anti-mold activity, preserving 84% freshness in fruits after one week.
• Steady release of thymol over ten days was observed, even under high humidity conditions.

Conclusions:

• The developed xylan/POSS composite film is a safe, biodegradable, and effective solution for food packaging.
• Controlled thymol release from the film enhances antioxidant and anti-mold properties, significantly extending fruit shelf life.
• This innovative packaging strategy presents a promising approach for sustainable food preservation.