Toxicological studies on malachite green: a triphenylmethane dye

Area of Science:

• Toxicology
• Pharmacology

Background:

• Malachite green is a synthetic dye with historical applications.
• Understanding its toxicological profile is crucial for safety assessments.

Purpose of the Study:

• To evaluate the acute and subchronic toxicity of malachite green oxalate.
• To assess its potential for mutagenicity and skin sensitization.

Main Methods:

• Oral LD50 determination in rats and mice.
• Dermal toxicity testing.
• 28-day repeated dose oral toxicity study in rats.
• Mutagenicity assays (Salmonella/microsome, micronucleus test).
• Skin and mucous membrane irritation tests.

Main Results:

• Oral LD50: 275 mg/kg (rats), 50 mg/kg (mice).
• No systemic effects from dermal application up to 2,000 mg/kg.
• Minor serum biochemical changes and decreased weight gain in rats at high doses.
• Irritation to mucous membranes, but not skin sensitization.
• Mutagenic in Salmonella/microsome test; not clastogenic in micronucleus test.

Conclusions:

• Malachite green oxalate has moderate acute oral toxicity and is a mucous membrane irritant.
• It demonstrates mutagenic potential but lacks clastogenic activity in vivo.
• Further investigation may be warranted for specific applications.