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Updated: Apr 11, 2026

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Comparative Metal Oxide Nanoparticle Toxicity Using Embryonic Zebrafish.

Leah C Wehmas1, Catherine Anders2, Jordan Chess2

  • 1Department of Environmental and Molecular Toxicology, Environmental Health Sciences Center, Oregon State University, 1007 Agriculture & Life Sciences Building, Corvallis, OR 97331, USA.

Toxicology Reports
|June 2, 2015
PubMed
Summary

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Engineered metal oxide nanoparticles (MO NPs) show promise in cancer treatment. However, zinc oxide nanoparticles (ZnO NPs) exhibited significant toxicity in zebrafish embryos, primarily due to dissolved zinc ions.

Area of Science:

  • Environmental toxicology
  • Nanomedicine
  • Materials science

Background:

  • Engineered metal oxide nanoparticles (MO NPs) are increasingly used in medicine, particularly as anticancer agents.
  • Assessing whole-animal toxicity is crucial for validating the in vivo anticancer efficacy of MO NPs.
  • Nanoparticle behavior in aqueous solutions, including agglomeration, complicates toxicity assessments based on size and charge.

Purpose of the Study:

  • To compare the toxicity of seven semiconductor MO NPs in a five-day embryonic zebrafish assay.
  • To investigate the influence of physicochemical properties, elemental composition, and dissolution on MO NP toxicity.
  • To determine the role of zinc ion dissolution in the observed toxicity of zinc oxide (ZnO) nanoparticles.

Main Methods:

Keywords:
ICP OEScerium dioxidedissolutionnanoparticlestin dioxidetitanium dioxidezebrafishzinc oxide

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  • Utilized a five-day embryonic zebrafish assay to evaluate the toxicity of seven semiconductor MO NPs (ZnO, TiO2, CeO2, SnO2).
  • Prepared MO NPs in both pure water and synthetic seawater to assess environmental influences.
  • Analyzed NP agglomeration, elemental composition, and dissolution potential, specifically measuring zinc ion release from ZnO NPs.

    • Main Results:

    • Only zinc oxide (ZnO) nanoparticles caused significant adverse effects, specifically in pure water (LC50: 3.5-9.1 mg/L).
    • ZnO NP toxicity was life stage dependent, with larval exposure showing a ~22.7-fold increase in toxicity compared to embryonic exposure.
    • High levels of dissolved zinc ions (40-89% of total sample) were detected from ZnO NPs, suggesting a major contribution to toxicity.

    Conclusions:

    • Elemental composition and dissolution potential are key drivers of MO NP toxicity, overriding characteristics like size and charge due to agglomeration.
    • Zinc oxide nanoparticles pose a significant toxicity risk in aquatic environments, particularly in freshwater.
    • Dissolved zinc ions (Zn2+) are likely the primary toxic agent responsible for ZnO NP-induced adverse effects in zebrafish.