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Toxicity Testing in Animals

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...

Toxic Reactions: Overview

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...

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Related Experiment Video

Updated: May 31, 2026

Identification of Pharmaceuticals in The Aquatic Environment Using HPLC-ESI-Q-TOF-MS and Elimination of Erythromycin Through Photo-Induced Degradation

Identification of Pharmaceuticals in The Aquatic Environment Using HPLC-ESI-Q-TOF-MS and Elimination of Erythromycin Through Photo-Induced Degradation

Published on: August 1, 2018

Ecotoxicity evaluation of selected sulfonamides.

Anna Białk-Bielińska¹, Stefan Stolte, Jürgen Arning

¹Department of Environmental Analysis, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland. abialk@chem.univ.gda.pl

|July 15, 2011

Summary

Sulfonamides (SAs) antibiotics contaminate the environment. This study reveals SAs are toxic to algae and even more harmful to duckweed, impacting aquatic and terrestrial ecosystems.

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Area of Science:

Environmental Science
Ecotoxicology
Pharmaceuticals

Background:

Sulfonamides (SAs) are widely used veterinary antibiotics with increasing environmental contamination.
Existing ecotoxicity data for SAs is limited, necessitating a systematic evaluation.
Understanding the environmental impact of SAs is crucial due to their widespread use.

Purpose of the Study:

To systematically analyze the ecotoxicological potential of 12 different sulfonamides (SAs).
To assess the impact of SAs on bacteria, algae, and plants, covering aquatic and terrestrial environments.
To compare the toxicity of SAs with a known herbicide, atrazine.

Main Methods:

A flexible ecotoxicological test battery was employed.
Tests included enzymes (acetylcholinesterase, glutathione reductase), luminescent marine bacteria (Vibrio fischeri), soil bacteria (Arthrobacter globiformis), green algae (Scenedesmus vacuolatus), and duckweed (Lemna minor).
Toxicity was measured using EC50 values.

Main Results:

Sulfonamides demonstrated toxicity towards green algae, with EC50 values ranging from 1.54 to 32.25 mg L⁻¹.
SAs exhibited a stronger adverse effect on duckweed (Lemna minor), with EC50 values from 0.02 to 4.89 mg L⁻¹.
The toxicity of SAs to duckweed was greater than that of the herbicide atrazine (EC50 = 2.59 mg L⁻¹).

Conclusions:

Sulfonamides pose a significant ecotoxicological risk to both aquatic (algae) and terrestrial (duckweed) organisms.
Duckweed is particularly sensitive to SA contamination, indicating potential disruption of plant-based ecosystems.
Further research into SA ecotoxicity is vital for environmental risk assessment and management strategies.