Rethinking plastic waste: innovations in enzymatic breakdown of oil-based polyesters and bioplastics

Area of Science:

• Biocatalysis and Environmental Science
• Polymer Chemistry and Engineering

Background:

• Global plastic waste exceeds 360 million tonnes annually, posing a significant environmental threat due to persistence.
• Current end-of-life options for plastics, including bioplastics, often require industrial conditions for effective degradation.
• Enzyme-based depolymerization presents a sustainable, circular economy-aligned alternative for managing plastic waste.

Purpose of the Study:

• To review recent advancements in the enzymatic degradation of both oil-derived and bio-based polyesters.
• To highlight key innovations in biocatalysis for plastic waste management.
• To explore future strategies for sustainable plastic valorization.

Main Methods:

• Summarizing recent literature on enzymatic degradation of polyesters like PET, PLA, PBAT, and PHAs.
• Discussing novel high-throughput screening methods for enzyme discovery and improvement.
• Exploring computational workflows for enhancing enzyme efficiency and de novo biocatalyst design.

Main Results:

• Significant progress in developing and improving enzymes for polyester depolymerization.
• Advancements in microbial platforms and enzyme-embedded self-biodegrading materials.
• Demonstration of biocatalysis's potential in addressing synthetic polymer pollution.

Conclusions:

• Enzymatic depolymerization is a key technology for sustainable plastic waste valorization.
• Integration with upcycling pathways and standardized bioprocesses will enhance efficiency.
• Biocatalysis is redefining approaches to tackle global plastic pollution.