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Toxicokinetics of ethers used as fuel oxygenates
W Dekant1, U Bernauer, E Rosner
1Department of Toxicology, University of Würzburg, Versbacher Str. 9, 97078 Würzburg D, Germany. dekant@toxi.uni-wuerzburg.de
Toxicology Letters
|October 31, 2001
Summary
Methyl-tert-butyl ether (MTBE), ethyl-tert-butyl ether (ETBE), and tert-amyl-methyl ether (TAME) show rapid uptake in rats and humans. Biotransformation is similar in both species, suggesting low toxicity risk from these gasoline additives.
Area of Science:
- Environmental Chemistry
- Toxicology
- Pharmacokinetics
Background:
- Methyl-tert-butyl ether (MTBE), ethyl-tert-butyl ether (ETBE), and tert-amyl-methyl ether (TAME) are widely used gasoline additives.
- Widespread use presents a significant potential for human exposure through inhalation.
Purpose of the Study:
- To summarize the toxicokinetics and biotransformation of MTBE, ETBE, and TAME in rats and humans.
- To assess the potential for toxic metabolite formation and associated health risks.
Main Methods:
- Comparative analysis of toxicokinetic data (uptake, clearance) in rats and humans following inhalation exposure.
- Evaluation of biotransformation pathways and metabolite profiles in both species.
Main Results:
- Rapid uptake of MTBE, ETBE, and TAME observed in both rats and humans after inhalation.
- Rats exhibit faster exhalation clearance and urinary metabolite excretion compared to humans.
- Qualitative and quantitative similarities in MTBE and ETBE biotransformation between rats and humans.
- Similar extent of TAME biotransformation, but different metabolic pathways observed in rats and humans.
Conclusions:
- The biotransformation of MTBE, ETBE, and TAME does not appear to generate reactive or toxic metabolites.
- Toxic effects mediated by covalent binding to cellular macromolecules are unlikely for these ether compounds.