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Appl Environ Microbiol. 1986 July; 52(1): 200-202
Copyright © 1986, American Society for Microbiology. All Rights Reserved.

Incorporation of Oxygen from Water into Toluene and Benzene during Anaerobic Fermentative Transformation

Timothy M. Vogel and Dunja Grbìc-Galìc*

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, California 94305

ABSTRACT

Toluene and benzene were anaerobically transformed and eventually mineralized in mixed methanogenic cultures. However, the source of oxygen for the initial oxidation step had been unknown, owing to the presence of both methanol and water. No exogenous electron acceptors other than carbon dioxide, toluene, and benzene were present in the defined mineral medium. Through the use of 18O-labeled water, the oxygen incorporated into the monoaromatic compounds was shown to come from water. The cresol from the toluene and the phenol from the benzene contained up to 8% 18O label after incubation in 9% 18O-labeled medium. Gas chromatography-mass spectrometry was used to detect the 18O-labeled aromatic metabolites.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1986 July; 52(1): 200-202
Copyright © 1986, American Society for Microbiology. All Rights Reserved.



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Copyright © 1986 by the American Society for Microbiology. All rights reserved.