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Isolation and Characterization of Polyethylene-Degrading Microbes from the Digestive System of Perionyx excavates
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Researchers isolated 11 bacterial and 5 fungal strains from the digestive system of the earthworm Perionyx excavatus and found that fungal strains exhibited higher polyethylene degradation rates than bacteria, with FTIR analysis and weight loss measurements confirming structural breakdown of UV-pretreated polyethylene.
Background: Polyethylene's resistance to degradation and adverse environmental impacts necessitates urgent intervention.This study explores microbial degradation, focusing on earthworms, particularly Perionyx excavatus, as potential agents for efficient plastic degradation.Methodology: 11 bacterial and 5 fungal strains isolated from P. excavatus were characterized for their potential in polyethylene breakdown.Polyethylene underwent pre-treatment with 30% H2O2 under UV light, inducing observable changes.Microbial degradation experiments compared bacterial and fungal rates.Microscopic imaging and FTIR analysis validated structural changes, and weight loss measurements quantified degradation.Results: Fungal strains exhibited higher polyethylene degradation rates than bacteria.Microscopic imaging and FTIR analysis confirmed successful degradation by both.Weight loss measurements quantified substantial compromise in polyethylene tensile strength. Conclusion:Microbial-mediated degradation, exemplified by bacterial isolate 6 (BAC 6), offers a sustainable approach to polyethylene waste management.BAC 6, a novel species related to Bacillus cereus strain JCM 2152, This research highlights the efficacy of earthworm-associated microbes in polyethylene degradation, offering a sustainable waste management solution with global implications for addressing plastic pollution.The findings contribute to interdisciplinary approaches for a sustainable future.
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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.
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Researchers examined the potential of earthworms to accelerate the biodegradation of both conventional and biobased biodegradable plastics in soil, finding that earthworm activity can enhance the physical fragmentation and microbial degradation of some polymers, though effectiveness varies significantly by polymer type. The study suggests earthworm-assisted composting as a partial strategy to reduce agricultural plastic pollution.
Earthworms Exposed to Polyethylene and Biodegradable Microplastics in Soil: Microplastic Characterization and Microbial Community Analysis
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Researchers exposed earthworms to biodegradable and conventional polyethylene microplastics in natural soil and found that worms ingested both types. The biodegradable plastic showed signs of partial breakdown in the earthworm gut, while conventional polyethylene remained unchanged. Although microplastics did not significantly alter the soil or gut microbiome in this study, the results confirm that earthworms transport microplastics through soil ecosystems.
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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.
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