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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Ecotoxicity test methods for engineered nanomaterials: practical experiences and recommendations from the bench.

Richard D Handy1, Geert Cornelis, Teresa Fernandes

  • 1Ecotoxicology Research and Innovation Centre, School of Biomedical & Biological Sciences, University of Plymouth, Plymouth, UK. rhandy@plymouth.ac.uk

Environmental Toxicology and Chemistry
|October 18, 2011
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Summary

This review identifies practical challenges in engineered nanomaterial (ENM) ecotoxicology research and proposes nano-specific protocol modifications. Standardizing methods and developing new endpoints are crucial for accurate ENM risk assessment.

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Nanotechnology

Background:

  • Ecotoxicology research utilizes various methods for engineered nanomaterials (ENMs).
  • Collective researcher experience and documented practical issues are lacking.
  • Existing protocols may not adequately address ENM-specific properties.

Purpose of the Study:

  • To document practical issues encountered when working with ENMs in ecotoxicology.
  • To suggest nano-specific modifications for existing ecotoxicity testing protocols.
  • To provide recommendations for improving ENM ecotoxicity assessment.

Main Methods:

  • Review of generic and specific practical issues in ENM ecotoxicology.
  • Consideration of aquatic tests, marine grazers, soil organisms, and bioaccumulation studies.
  • Analysis of current regulatory test protocols and potential modifications.

Main Results:

  • Glassware cleaning is adequate, but electrodes are problematic.
  • Maintaining exposure concentration is challenging; media characterization lacks rapid methods.
  • Standardization of minor protocol deviations (shaking, lighting, mixing) is needed for ENMs.

Conclusions:

  • Most ecotoxicology methodologies require amendments for ENM assessment.
  • Nano-specific biological endpoints and tiered monitoring schemes are recommended.
  • Modifications are needed for invertebrate, fish, soil, and bioaccumulation tests.