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Purpose <p>Polyethylene plastic is a widely used plastic material, but its slow degradation process can affect the stability of ecosystems. There are a very limited number of bacterial species known to be capable of degrading polyethylene, and the degradation capacity of these bacteria is usually low.</p> Methods <p>In this study, we isolated three strains of microorganisms PDB-1, PDB-2, and PDB-3 with polyethylene degradation functions from a landfill. Its classification was confirmed by 16&#xa0;S rRNA gene sequencing and traditional microbiological methods, and its degradation process was analyzed using techniques such as mass loss, scanning electron microscopy, and gel permeation chromatography.</p> Results <p>The weight loss analysis showed that the weight loss of polyethylene film was 11.5% (PDB-1), 10.87% (PDB-2), and 6.3% (PDB-3), which is ahead of the existing related studies. Scanning electron microscopy observed significant breakage on the microbially degraded polyethylene membranes, while water contact angle tests showed an increase in hydrophilicity for all treated membranes. Fourier Transform Infrared Spectroscopy analysis showed that the vibration of O-H and C = C peaks in PDB-1-treated polyethylene membranes was significantly enhanced.</p> Conclusion <p>Combining the above results, it is clear that PDB-1, PDB-2, and PDB-3 are all capable of effectively degrading PE polymers, with PDB-1 having the strongest degradation ability. This provides a theoretical basis for the development of more efficient plastic-degrading microorganisms in the future. The research results are expected to be applied to practical plastic waste treatment and environmental remediation.</p>

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Enhancement of polyethylene biodegradation by high-performance bacterial isolates

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Hong Zhang,
  • Fan Yang,
  • Mengzong Hou,
  • Run Hu,
  • Lisha Song,
  • Qiang Liu,
  • Yanjiao Qi,
  • Juanli Liu

摘要

Purpose

Polyethylene plastic is a widely used plastic material, but its slow degradation process can affect the stability of ecosystems. There are a very limited number of bacterial species known to be capable of degrading polyethylene, and the degradation capacity of these bacteria is usually low.

Methods

In this study, we isolated three strains of microorganisms PDB-1, PDB-2, and PDB-3 with polyethylene degradation functions from a landfill. Its classification was confirmed by 16 S rRNA gene sequencing and traditional microbiological methods, and its degradation process was analyzed using techniques such as mass loss, scanning electron microscopy, and gel permeation chromatography.

Results

The weight loss analysis showed that the weight loss of polyethylene film was 11.5% (PDB-1), 10.87% (PDB-2), and 6.3% (PDB-3), which is ahead of the existing related studies. Scanning electron microscopy observed significant breakage on the microbially degraded polyethylene membranes, while water contact angle tests showed an increase in hydrophilicity for all treated membranes. Fourier Transform Infrared Spectroscopy analysis showed that the vibration of O-H and C = C peaks in PDB-1-treated polyethylene membranes was significantly enhanced.

Conclusion

Combining the above results, it is clear that PDB-1, PDB-2, and PDB-3 are all capable of effectively degrading PE polymers, with PDB-1 having the strongest degradation ability. This provides a theoretical basis for the development of more efficient plastic-degrading microorganisms in the future. The research results are expected to be applied to practical plastic waste treatment and environmental remediation.