Metabolic by-products of anaerobic toluene degradation by sulfate-reducing enrichment cultures

Author:

Beller H R1,Reinhard M1,Grbić-Galić D1

Affiliation:

1. Department of Civil Engineering, Stanford University, California 94305-4020.

Abstract

Two dead-end metabolites of anaerobic toluene transformation, benzylsuccinic acid and benzylfumaric acid, accumulated in sulfate-reducing enrichment cultures that were fed toluene as the sole carbon source. Stable isotope-labeled toluene and gas chromatography-mass spectrometry were used to confirm that the compounds resulted from toluene metabolism. The two metabolites constituted less than 10% of the toluene carbon (over 80% was mineralized to carbon dioxide, according to a previous study). This study demonstrates that the novel nonproductive pathway proposed by Evans and coworkers (P. J. Evans, W. Ling, B. Goldschmidt, E. R. Ritter, and L. Y. Young, Appl. Environ. Microbiol. 58:496-501, 1992) for a denitrifying pure culture applies to disparate anaerobic bacteria.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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