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An Investigation into the Feasibility of using MHETase and PETase for Water Treatment Due to the Increase of Microplastic Ingestion through Tap Water
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This study investigated the feasibility of using MHETase and PETase enzymes — originally derived from plastic-eating bacteria — for treating PET plastic contamination in water. Enzyme activity was measurable against PET substrates, supporting further development of enzyme-based water treatment for plastic pollution.
Polyethylene terephthalate (PET) is the most abundantly produced plastic due to packaging and textiles, contributing to the widespread presence in the environment and the generation microplastics. Given microplastics high absorption rates and hydrophobicity they can accumulate toxic chemicals making them hazardous. When large quantities of microplastics infiltrate drinking water treatment facilities the public is exposed to these toxic chemicals, potentially resulting in various cancers and reproductive disorders. In response to the accumulating microplastics in the environment biochemical engineers have begun to analyze microbial solutions, such as enzymes MHETase and PETase, which can enzymically degrade PET polymers and metabolically assimilate them as a carbon nutrient source. However, it is unknown whether these enzymes can be adapted to drinking water treatment processes. To address this, an experimentation of inquiry was conducted to analyze the digestion rate of PET plastic when exposed to environments resembling those of drinking water treatment facilities. By introducing water samples collected from the Ann Arbor Drinking Water Treatment Facility and analyzing the change in phenol indicator color and mass of PET plastic samples. The research design concluded that despite the introduction of water samples there was no significant change in the digestion rate as compared to control samples, suggesting the feasibility of utilizing MHETase and PETase as a water treatment solution for PET microplastics within drinking water treatment facilities.
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Enzymatic Biodegradation of PET Plastics
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Plastic bottles and containers (made of PET) don't break down naturally—they just crumble into tiny microplastic pieces that end up in our food, water, and eventually our bodies. This review paper explains how scientists are studying special bacterial enzymes (called PETase and MHETase) that can actually digest PET plastic into harmless building blocks, offering a promising tool for cleaning up plastic pollution before it becomes a bigger health problem.
Environmental Implications of Plastic-degrading Bacterial Enzymes in Polyethylene Terephthalate Bioremediation
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Scientists have discovered bacteria that produce special enzymes capable of breaking down PET plastic (the material used in water bottles and food packaging) into simpler, harmless building blocks—a promising alternative to traditional recycling that could reduce plastic waste and the microplastics that end up in our water, food, and bodies. This review paper pulls together existing research to show that while these enzymes work well in controlled industrial settings, using them out in nature (like oceans or landfills) still needs more safety testing before we can trust it won't cause unexpected environmental problems. In short, this is encouraging progress toward tackling plastic poll
A sequence- and structure-based characterization of microbial enzymes identifies P. stutzeri as a plastic-degrading species
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Researchers characterized microbial enzymes with potential plastic-degrading capabilities, focusing on PETase and MHETase enzyme systems. The study identified Pseudomonas stutzeri as a species with notable plastic degradation potential, contributing to the growing understanding of biological approaches for addressing plastic pollution through enzymatic bioremediation.
Enzymatic Remediation of Polyethylene Terephthalate (PET)–Based Polymers for Effective Management of Plastic Wastes: An Overview
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Enzymatic approaches for remediating PET-based plastic waste were reviewed, covering PETase and related enzymes that can break PET into reusable monomers. Enzyme engineering strategies to improve thermostability and catalytic efficiency are discussed as a pathway to scalable biological PET recycling.
Genetic code expansion of plastic-degrading enzymes for detection of microplastics
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Researchers engineered PET-degrading enzymes to create variants that form covalent bonds with PET microplastic particles, enabling enzyme-based detection of microplastics. This proof-of-concept work repurposes plastic-degrading enzymes as analytical detection tools.
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