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Related Concept Videos

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Bioplastics

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Microbial Bioremediation of Plastics01:28

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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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The comparison effect on earthworms between conventional and biodegradable microplastics.

Hailong Lai1, Shuwen Han1,2,3, Jinyu Sun1

  • 1College of Environmental Science and Engineering, Yangzhou University, 225009, Yangzhou, Jiangsu Province, China.

Heliyon
|September 23, 2024
PubMed
Summary

Conventional and biodegradable microplastics harm earthworms, with polyethylene showing more severe short-term effects. Earthworms may adapt to microplastics long-term, but further research on polylactic acid

Keywords:
AdaptationEarthwormsMicroplasticOxidative stressPolyethylenePolylactic acid

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Soil Biology

Background:

  • Microplastic (MP) pollution impacts organisms, yet biodegradable plastics' long-term effects remain understudied.
  • Conventional plastics like polyethylene (PE) show short-term toxicity, but biodegradable plastics like polylactic acid (PLA) require more research.
  • Earthworms are crucial soil organisms, making them ideal models for assessing microplastic impacts.

Purpose of the Study:

  • To investigate the toxic effects of PE and PLA microplastics on earthworms.
  • To compare the impacts of conventional versus biodegradable microplastics under varying exposure durations.
  • To evaluate the relationship between microplastic exposure and earthworm antioxidant enzyme activity.

Main Methods:

  • Earthworms were exposed to PE and PLA microplastics (0.5%, 2%, 5% w/w) at different particle sizes (149, 28, 13 μm).
  • Exposure periods included short-term (14 days) and long-term (28 days).
  • Enzyme activities (superoxide dismutase, catalase) and malondialdehyde levels were measured to assess oxidative stress.

Main Results:

  • Polyethylene (PE) microplastics exhibited more pronounced negative effects on earthworms than polylactic acid (PLA) microplastics, especially in the short term.
  • Earthworms showed signs of adaptation to both PE and PLA microplastics after longer-term exposure.
  • A strong correlation was observed between microplastic exposure levels and earthworm antioxidant enzyme responses.

Conclusions:

  • Both PE and PLA microplastics negatively affect earthworms, but PLA's impact is less severe over longer exposure periods.
  • Earthworm adaptation to microplastics may occur with prolonged exposure.
  • Further research is needed to fully understand the agricultural implications of polylactic acid (PLA) use on soil ecosystems.