Alizarin Dye: Toxicity, Genotoxicity, and Histopathological Alterations in Model Organisms

Area of Science:

• Environmental Toxicology
• Genetics
• Marine Biology

Background:

• Alizarin, a widely used textile dye, poses environmental risks due to its presence in industrial effluents.
• Previous studies indicate alizarin's aquatic toxicity, mutagenic, and carcinogenic potential.

Purpose of the Study:

• To further evaluate the aquatic toxicity of alizarin using various marine organisms.
• To confirm the genotoxic and mutagenic effects of alizarin in alternative model systems.

Main Methods:

• Acute and chronic toxicity tests were conducted on crustaceans (Daphnia similis), mussels (Mytilus galloprovincialis), fish embryos (Danio rerio), and algae.
• Histopathological analysis of gonads and assessment of DNA damage in hemocytes and sperm of Parhyale hawaiensis were performed.
• Mutagenicity was confirmed using a miniaturized Ames test.

Main Results:

• Alizarin exhibited significant aquatic toxicity, with EC50 values for D. similis ranging from 68.6 to 105 μg/L.
• LC50 for D. rerio embryos was 45.8 μg/L, with sublethal effects observed at 20.8 μg/L.
• In vivo exposures led to histopathological alterations in M. galloprovincialis gonads and increased DNA damage and micronuclei frequency in P. hawaiensis, confirming mutagenicity.

Conclusions:

• Alizarin is classified as Category 1 acute aquatic toxicity under the Globally Harmonized System (GHS).
• The dye causes adverse histopathological and DNA effects on reproductive systems in model organisms.
• Alizarin is identified as a potential germ cell mutagen, necessitating careful management of textile effluents.