From Waste to Value: Fruit Biofillers in Biodegradable Composite Materials

Area of Science:

• Materials Science
• Sustainable Polymers
• Biocomposites

Background:

• Growing demand for sustainable alternatives to single-use plastics.
• Need for valorization of agricultural waste streams, such as fruit processing by-products.
• Limited development of high-performance biodegradable composites from lignocellulosic biomass.

Purpose of the Study:

• To develop biodegradable composites from peach and apple processing waste using hot compression molding.
• To systematically evaluate the impact of process variables on composite properties.
• To assess the mechanical performance, water resistance, and biodegradability of the developed green composites.

Main Methods:

• Utilized a definitive screening design to optimize process variables (recipe, grinding size, pressure, temperature, holding time).
• Characterized composite properties including physical, mechanical (stiffness, flexural strength, modulus of elasticity), water absorption, and diffusivity.
• Assessed biodegradability via soil burial tests over 200 days.

Main Results:

• Optimal conditions yielded composites with a modulus of elasticity exceeding 1000 MPa.
• Increased molding pressure and holding time reduced thickness and enhanced stiffness and strength.
• Higher molding temperatures and lignin content reduced water absorption and improved water resistance.
• Soil burial tests showed significant weight loss (54.2%–90.7%), with apple composites degrading faster.

Conclusions:

• Successfully developed a plastic-free, biodegradable composite material from fruit waste, inspired by biomimetic principles.
• Demonstrated the potential of lignocellulosic biomass self-bonding for creating sustainable materials.
• Highlighted the suitability of these green composites for foodservice industry applications.