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Biotechnological model for ubiquitous mixed petroleum- and bio-based plastics degradation and upcycling into bacterial nanocellulose

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In this study, a model system for the sustainable management of mixed (petro-bio)plastic waste is presented, demonstrating a biotechnological route through synergy-promoted enzymatic degradation of PET–representing petrochemical polyester plastic–mixed with thermoplastic starch (TPS)–as a model bioplastic. Leaf-branch compost cutinase (LCCICCG) and commercial amylase (AMY) deliver effective depolymerization of this mixed (petro-bio)plastic material, with subsequent bio-upcycling of the mixed waste stream into bacterial nanocellulose (BNC) by Komagataeibacter medellinensis. Compared to LCCICCG and AMY, the LCCICCG/AMY combined treatment synergistically produced a 2.6- and 4.4-fold increase in enzymatic decomposition at 70 °C in four days, respectively, yielding sugars and terephthalic acid (TPA) as the main depolymerization building blocks. Bio-upcycling of post-enzymatic degradation hydrolysates resulted in a high BNC yield of 3 g/L after 10 days.

Read more here:

https://www.sciencedirect.com/science/article/pii/S0959652624004724?via%3Dihub

Project title

Eco conversion of lower grade PET and mixed recalcitrant PET plastic waste into high performing biopolymers

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This project has received funding from the European Union’s Horizon Europe EIC Pathfinder programme under grant agreement No 101046758

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The project leading to this application has received funding from the European Union’s Horizon Europe EIC Pathfinder programme under agreement No 101046758

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Views and opinions expressed are of the author(s) only and do not necessarily reflect those of the European Union or European Innovation Council. Neither the European Union nor the granting authority can be held responsible for them.