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Annual Review of Chemical and Biomolecular Engineering

Volume 15, 2024

Biological Upcycling of Plastics Waste

Abstract

Plastic wastes accumulate in the environment, impacting wildlife and human health and representing a significant pool of inexpensive waste carbon that could form feedstock for the sustainable production of commodity chemicals, monomers, and specialty chemicals. Current mechanical recycling technologies are not economically attractive due to the lower-quality plastics that are produced in each iteration. Thus, the development of a plastics economy requires a solution that can deconstruct plastics and generate value from the deconstruction products. Biological systems can provide such value by allowing for the processing of mixed plastics waste streams via enzymatic specificity and using engineered metabolic pathways to produce upcycling targets. We focus on the use of biological systems for waste plastics deconstruction and upcycling. We highlight documented and predicted mechanisms through which plastics are biologically deconstructed and assimilated and provide examples of upcycled products from biological systems. Additionally, we detail current challenges in the field, including the discovery and development of microorganisms and enzymes for deconstructing non–polyethylene terephthalate plastics, the selection of appropriate target molecules to incentivize development of a plastic bioeconomy, and the selection of microbial chassis for the valorization of deconstruction products.

Keyword(s): biological plastic deconstruction, biological plastic upcycling, enzyme discovery, plastics bioeconomy
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/content/journals/10.1146/annurev-chembioeng-100522-115850
2024-07-24
2025-04-25
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Biological Upcycling of Plastics Waste
Annual Review of Chemical and Biomolecular Engineering 15, 315 (2024); https://doi.org/10.1146/annurev-chembioeng-100522-115850
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