Corncob-derived biodegradable packaging films: A sustainable solution for raspberry post-harvest preservation

Area of Science:

• Materials Science
• Food Science
• Environmental Science

Background:

• Plastic food packaging poses ecological and health risks due to microplastic and nanoplastic migration.
• Agricultural byproducts offer a sustainable alternative for packaging, reducing environmental and economic burdens.
• Valorization of agricultural waste is crucial for sustainable resource management.

Purpose of the Study:

• To develop biodegradable packaging films from cellulosic residue of corncob.
• To evaluate the efficacy of these films in extending the shelf-life of raspberries.
• To assess the environmental impact and biodegradability of the novel packaging material.

Main Methods:

• Cellulosic residue from corncob was solubilized in zinc chloride (ZnCl2) solution.
• Films were formed by crosslinking with calcium (Ca2+) ions and plasticizing with sorbitol.
• Packaging performance was tested for water vapor permeability, tensile strength, elongation, UV-blocking, antioxidant properties, and biodegradability.

Main Results:

• The optimized film exhibited favorable properties: water vapor permeability of 1.8(4) x10^-10 g^-1 s^-1 Pa^-1, tensile strength of 4.7(1) MPa, and elongation at break of 15.4(7)%.
• The film demonstrated UV-blocking and antioxidant capabilities.
• Biodegradation occurred within 29 days at 24% soil moisture; raspberry shelf-life was extended by 7 days (room temp) and 5 days (refrigerated) compared to polystyrene.

Conclusions:

• Corncob-derived cellulosic films offer a promising biodegradable alternative to conventional plastic packaging.
• This approach adds value to agricultural residues, minimizes post-harvest losses, and reduces food waste.
• The developed packaging contributes to mitigating plastic pollution and enhancing food preservation.