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Green Biodegradation: Analysis of Potential Polyurethane-degrading Enzymes and Their Secretion in Chlamydomonas reinhardtii
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Researchers used the green alga Chlamydomonas reinhardtii to produce a potential polyurethane-degrading enzyme, analyzing which enzymes the alga secretes and whether they can break down plastic. Enzymatic plastic degradation using photosynthetic organisms could offer a solar-powered approach to addressing plastic pollution.
Plastic pollution is a critical global issue, with only 5% of plastics currently recycled. Polyester polyurethane (PU), a widely used plastic, can potentially be broken down using enzymatic biodegradation rather than mechanical processing that generates microplastics. This study focuses on PS5, a potential PU-degrading enzyme with esterase activity, capable of cleaving ester bonds found in PU structures. Researchers investigated the expression and secretion of PS5 in the green microalga Chlamydomonas reinhardtii, a sustainable production platform capable of generating PU precursors such as lipids and diacids while sequestering carbon. Experiments demonstrated that PS5 significantly outperformed commercial lipase in cleaving the FDA substrate, indicating high esterase activity. Algal transformants expressing PS5 also showed halo formation on Impranil®-agar plates, suggesting PU dispersion degradation. These findings highlight C. reinhardtii as a viable chassis for the production and secretion of plastic-degrading enzymes, offering a sustainable route to both upcycle and degrade PU products at the end of their lifecycle.
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Efficient secretion of a plastic degrading enzyme from the green algae Chlamydomonas reinhardtii
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Scientists engineered green algae (Chlamydomonas reinhardtii) to produce and secrete PHL7, an enzyme capable of breaking down PET plastic. The algae successfully secreted active enzyme that degraded both PET and polyurethane plastics in laboratory tests. This approach suggests that photosynthetic microorganisms could potentially be deployed as a biological tool to help break down plastic pollution in the environment.
Efficient secretion of a plastic degrading enzyme from the green algae Chlamydomonas reinhardtii
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Green algae Chlamydomonas reinhardtii was engineered to secrete the PHL7 plastic-degrading enzyme and selected on polyurethane-containing agar plates, with robust strains demonstrating efficient PET plastic breakdown, offering a photosynthetic platform for biological plastic degradation.
Environmental impact and mitigation of micro(nano)plastics pollution using green catalytic tools and green analytical methods
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Researchers reviewed the growing problem of microplastics and nanoplastics in the environment, then assessed enzyme-based strategies for breaking them down, finding that enzymes specifically targeting plastic polymer structures offer a promising, sustainable approach to degradation, especially when stabilized on nanomaterials to extend their activity.
Plastic-degradation Properties of Genetically Modified Algae
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Scientists are genetically engineering a type of algae to produce enzymes that break down plastic, aiming to tackle the growing problem of microplastic pollution in our food and water. In this early-stage study, researchers successfully modified the algae's DNA and grew one promising sample in the lab, though more testing is needed before this could be used to actually clean up microplastics at a larger scale. This matters because microplastics are notoriously hard to filter out of water due to their tiny size, and finding a biological way to break them down could eventually help reduce human exposure to this widespread contaminant.
Microbial enzyme power: Breaking down microplastics for a cleaner planet
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This review examines how microbial enzymes produced by bacteria, fungi, and algae can break down and degrade microplastic polymers. The study suggests that enzymatic biodegradation represents a promising and more sustainable alternative to conventional microplastic removal methods, though further research is needed to improve enzyme efficiency and scalability.
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