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Updated: Jun 1, 2025

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Can biodegradable plastics mitigate plastamination? Feedbacks from marine organisms.

Loredana Manfra1, Luisa Albarano2, Alice Rotini3

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Journal of Hazardous Materials
|January 19, 2025
PubMed
Summary

Biodegradable (PLA) and non-biodegradable (PP) microplastics show similar toxicity to marine life. This challenges the effectiveness of biodegradable plastics in reducing environmental harm and highlights the need for a One Health approach.

Keywords:
BioassaysBiodegradable polymersMarine speciesMicroplasticsMolecular responsesPlastic pollution

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Area of Science:

  • Marine Ecotoxicology
  • Environmental Science
  • Polymer Science

Background:

  • The EU plastic strategy promotes biodegradable polymers to reduce petrochemical plastic pollution.
  • However, biodegradable plastics may generate microplastics (MPs) with unknown environmental impacts.
  • Assessing the ecotoxicity of both biodegradable and non-biodegradable MPs is crucial.

Purpose of the Study:

  • To evaluate the ecotoxicological effects of polylactic acid (PLA) and polypropylene (PP) microplastics and their leachates on diverse marine species.
  • To investigate the impact of microplastics on different trophic levels and life stages.
  • To understand the molecular mechanisms of microplastic toxicity.

Main Methods:

  • Exposure of seven marine species (bacteria, algae, rotifers, copepods, amphipods, branchiopods) to PLA and PP microplastics and their leachates.
  • Dose-dependent toxicity testing on different life stages of *Artemia franciscana*.
  • Molecular analysis of Heat shock protein (HSP) mRNA levels in *A. franciscana*.

Main Results:

  • Both PLA and PP microplastics exhibited toxic effects on three consumer species, but not on decomposers or primary producers.
  • Leachates showed no adverse effects on five tested species.
  • A dose-dependent toxicity of PP and PLA was observed in *A. franciscana*, with more advanced life stages being more sensitive.
  • Molecular analysis indicated HSPs' role in oxidative stress response and potential irreversible damage in *A. franciscana* juveniles.

Conclusions:

  • PLA and PP microplastics may have comparable ecotoxicological impacts, questioning the environmental benefit of biodegradable alternatives.
  • The study underscores the importance of considering trophic levels, life stages, and feeding strategies in microplastic risk assessment.
  • A One Health perspective is essential for evaluating the broader implications of microplastic pollution.