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Potential Use of Microbial Enzymes for the Conversion of Plastic Waste Into Value-Added Products: A Viable Solution
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This review examines microbial enzymes capable of hydrolyzing PLA-PET mixed plastic waste, evaluating enzymatic degradation pathways and the potential for enzyme-based plastic valorization as an economically viable alternative to chemical recycling.
The widespread use of commercial polymers composed of a mixture of polylactic acid and polyethene terephthalate (PLA-PET) in bottles and other packaging materials has caused a massive environmental crisis. The valorization of these contaminants via cost-effective technologies is urgently needed to achieve a circular economy. The enzymatic hydrolysis of PLA-PET contaminants plays a vital role in environmentally friendly strategies for plastic waste recycling and degradation. In this review, the potential roles of microbial enzymes for solving this critical problem are highlighted. Various enzymes involved in PLA-PET recycling and bioconversion, such as PETase and MHETase produced by Ideonella sakaiensis; esterases produced by Bacillus and Nocardia; lipases produced by Thermomyces lanuginosus, Candida antarctica, Triticum aestivum, and Burkholderia spp.; and leaf-branch compost cutinases are critically discussed. Strategies for the utilization of PLA-PET's carbon content as C1 building blocks were investigated for the production of new plastic monomers and different value-added products, such as cyclic acetals, 1,3-propanediol, and vanillin. The bioconversion of PET-PLA degradation monomers to polyhydroxyalkanoate biopolymers by Pseudomonas and Halomonas strains was addressed in detail. Different solutions to the production of biodegradable plastics from food waste, agricultural residues, and polyhydroxybutyrate (PHB)-accumulating bacteria were discussed. Fuel oil production via PLA-PET thermal pyrolysis and possible hybrid integration techniques for the incorporation of thermostable plastic degradation enzymes for the conversion into fuel oil is explained in detail.
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Biodegradation of Plastic and the Role of Microbial Enzymes in Plastic Waste Management
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This review examines how microbial enzymes, particularly PET hydrolases and oxidative enzymes, can depolymerize and break down common plastic polymers through biological degradation. The study suggests that enzymatic approaches to plastic waste management offer a promising complement to mechanical and chemical recycling, though optimizing enzyme activity and scaling up the process remain key challenges.
Microbial enzymes for the recycling of recalcitrant petroleum‐based plastics: how far are we?
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This review examines the progress in identifying microbial enzymes capable of breaking down petroleum-based plastics like polyethylene, polystyrene, polyurethane, and PET. Researchers highlight recent advances in using polyester-degrading enzymes to recover raw materials from PET waste through biocatalytic recycling. The study discusses the potential and remaining challenges of using biological approaches to address the growing global problem of plastic waste accumulation.
Microbial Degradation and Valorization of Plastic Wastes
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This review covers recent advances in microbial and enzymatic degradation of synthetic plastic wastes, summarizing the microorganisms and enzymes capable of attacking different polymer types and assessing the prospects for biological plastic waste treatment at scale.
Microbial plastic degradation: enzymes, pathways, challenges, and perspectives.
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This review synthesizes current knowledge on microbial plastic degradation, covering the enzymes and metabolic pathways involved in breaking down major synthetic polymers, the challenges limiting efficient biodegradation, and perspectives for engineering improved microbial solutions to plastic waste.
Microbial Degradation of PET Plastic Sustainably Yielding Commercially Viable Products
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This review summarizes research on microbial degradation of PET plastic and how the breakdown products could be valorized into commercially useful bioproducts. Converting PET waste biologically into valuable chemicals offers a more sustainable alternative to landfilling or incineration.
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