Biodegradable Chitosan-Based Films as an Alternative to Plastic Packaging.

Area of Science:

• Materials Science
• Environmental Science
• Biotechnology

Background:

• Synthetic packaging significantly contributes to environmental pollution.
• Biomaterials derived from food waste, like chitosan, are emerging as eco-friendly alternatives.
• Chitosan-metal oxide and chitosan-graphene films possess desirable mechanical and antibacterial properties.

Purpose of the Study:

• To investigate the biodegradability of chitosan-metal oxide (ZnO, TiO2, Fe2O3) and chitosan-graphene oxide-silver (CS-GO-Ag) films in a soil environment.
• To assess the potential of these biodegradable films for the packaging industry.
• To provide evidence of the utilization of these films by soil microorganisms.

Main Methods:

• Incubation of chitosan-metal oxide and chitosan-graphene films in a soil environment for up to 8 weeks.
• Monitoring the degradation process and observing the utilization of films by soil microorganisms.
• Evaluating the biodegradability based on the degradation timeline.

Main Results:

• Soil microorganisms effectively utilized chitosan films as a source of carbon and nitrogen.
• Complete degradation of chitosan-Fe2O3 (20:1) films was observed within 6 weeks.
• Chitosan-ZnO (20:1 and 10:1) films demonstrated complete degradation after 8 weeks.
• Evidence of biodegradability supports the practical application of these films in soil environments.

Conclusions:

• Chitosan-based films, particularly those incorporating metal oxides like iron and zinc, exhibit significant biodegradability in soil.
• These findings highlight the potential of these biomaterials as sustainable alternatives to conventional plastic packaging.
• The utilization by soil microbes confirms their eco-friendly nature and contribution to reducing plastic pollution.