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Decay of low-density polyethylene by bacteria extracted from earthworm's guts: A potential for soil restoration
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Researchers isolated bacteria from earthworm guts that were able to degrade low-density polyethylene, demonstrating that intestinal microbes from soil invertebrates may play a role in plastic breakdown. The findings suggest that earthworm gut microbiomes are a reservoir of plastic-degrading bacteria with potential applications for bioremediation of LDPE-contaminated soils.
Low-density polyethylene (LDPE) is the most abundant source of microplastic pollution worldwide. A recent study found that LDPE decay was increased and the size of the plastic was decreased after passing through the gut of the earthworm Lumbricus terrestris (Oligochaeta). Here, we investigated the involvement of earthworm gut bacteria in the microplastic decay. The bacteria isolated from the earthworm's gut were Gram-positive, belonging to phylum Actinobacteria and Firmicutes. These bacteria were used in a short-term microcosm experiment performed with gamma-sterilized soil with or without LDPE microplastics (MP). We observed that the LDPE-MP particle size was significantly reduced in the presence of bacteria. In addition, the volatile profiles of the treatments were compared and clear differences were detected. Several volatile compounds such as octadecane, eicosane, docosane and tricosane were measured only in the treatments containing both bacteria and LDPE-MP, indicating that these long-chain alkanes are byproducts of bacterial LDPE-MP decay.
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Fragmentation and depolymerization of microplastics in the earthworm gut: A potential for microplastic bioremediation?
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Researchers explored whether earthworms can break down microplastics in soil by passing them through their digestive systems. They found that earthworms fragmented and partially broke down polyethylene and biodegradable plastic particles, reducing their size and altering their chemical structure. This suggests earthworms could play a role in naturally reducing microplastic contamination in soil, though more research is needed to understand whether the smaller fragments pose their own risks.
The effects of high-density polyethylene and polypropylene microplastics on the soil and earthworm Metaphire guillelmi gut microbiota
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Researchers exposed earthworms to soil amended with high-density polyethylene and polypropylene microplastics for 28 days and examined changes in both the earthworm gut and soil microbial communities. They found that both types of microplastics significantly altered the composition and diversity of gut bacteria in the earthworms. The study suggests that microplastic contamination in soil can disrupt the gut microbiota of soil organisms, with potential consequences for soil ecosystem health.
Enhancing the biodegradability and environmental impact of microplastics utilizing Eisenia fetida earthworms with treated low-density polyethylene for sustainable plastic management
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Researchers used Eisenia fetida earthworms to improve the biodegradability of low-density polyethylene (LDPE) microplastics in soil, testing whether earthworm-mediated soil processing could enhance the breakdown of this persistent polymer. Earthworm activity increased LDPE fragmentation and promoted microbial colonization of plastic surfaces, suggesting vermicomposting as a strategy for managing soil plastic contamination.
Earthworms As An Emerging Biotechnological Intervention in the Mitigation of Microplastics
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This review explores the emerging role of earthworms as biological agents for degrading microplastics in soil environments. Researchers found that earthworm gut microflora and mucous secretions actively contribute to breaking down plastic polymers through enzymatic depolymerization. The study suggests that earthworm-mediated biodegradation could be a promising biotechnological approach for mitigating microplastic contamination in terrestrial ecosystems.
Isolation of Plastic Digesting Microbes from the Gastrointestinal Tract of Tenebrio Molitor
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Researchers isolated bacteria from the gut of Tenebrio molitor mealworm larvae that are capable of degrading polystyrene and polyethylene microplastics. The identified gut microbes showed plastic-degrading enzymatic activity, suggesting potential for bioremediation applications.
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