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Dimethylethanolamine: acute, 2-week, and 13-week inhalation toxicity studies in rats
D R Klonne1, D E Dodd, I M Pritts
1Bushy Run Research Center, Union Carbide Corporation, Export, Pennsylvania 15632.
Summary
Dimethylethanolamine (DMEA) inhalation causes nasal and ocular irritation, with higher concentrations leading to respiratory distress and mortality in rats. The no-observable-effect level for DMEA was determined to be 24 ppm.
Area of Science:
- Toxicology
- Inhalation Toxicology
- Chemical Safety
Background:
- Dimethylethanolamine (DMEA) is a versatile chemical with industrial and pharmaceutical applications.
- Understanding DMEA's toxicity is crucial for ensuring workplace safety and managing potential health risks.
Purpose of the Study:
- To evaluate the acute and subchronic inhalation toxicity of Dimethylethanolamine (DMEA).
- To determine the no-observable-effect level (NOEL) for DMEA inhalation exposure in rats.
Main Methods:
- Acute inhalation exposure (4-hour) to determine LC50.
- Subchronic inhalation studies (2-week and 13-week) with varying DMEA concentrations.
- Histopathological examination of target organs and clinical pathology assessments.
Main Results:
- Acute LC50 for DMEA was 1641 ppm; higher concentrations caused irritation and distress.
- Subchronic exposures showed dose-dependent ocular and respiratory irritation, with mortality at 586 ppm.
- The no-observable-effect level (NOEL) was established at 24 ppm, with transient corneal opacity observed at 76 ppm.
Conclusions:
- DMEA primarily acts as an ocular and upper respiratory tract irritant.
- Concentrations of 24 ppm or less did not produce significant toxicity in rats.
- The study identified 24 ppm as the no-observable-effect level for DMEA inhalation.