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Metabolic indicators for detecting in situanaerobic alkylbenzene degradation

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Abstract

Monitoring programs for intrinsic bioremediation of fuel hydrocarbonsrequire indicators that can convincingly demonstrate in situ metabolism. In this evaluation of potential indicators of in situ anaerobic alkylbenzene metabolism, laboratory and field data are reviewed for two classes of aromatic acids: (i) benzylsuccinate, E-phenylitaconate, and their methyl homologs, and (ii) benzoate, and methyl-, dimethyl-, and trimethylbenzoates. The review includes previously unpublished field data from a hydrocarbon-contaminated site in Fallon (Nevada), at which both classes of metabolites were detected in groundwater. The two classes of compounds were evaluated with respect to specificity (i.e., unique biochemical relationship to a specific alkylbenzene), stability, and generation as degradation intermediates versus dead-end products; recent developments in the biochemistry of anaerobic toluene and xylene degradation were incorporated in this evaluation. In general, benzylsuccinates/E-phenylitaconates are superior to benzoates in terms of their very high specificity to their parent hydrocarbons and their lack of commercial and industrial sources. They are also uniquely indicative of anaerobic conditions. All of the benzoates, benzylsuccinates, and E-phenylitaconates are relatively stable chemically and (with the exceptionof benzoate) biologically under anaerobic conditions, based on the limited data available. Although benzoate, benzylsuccinate, and E-phenylitaconate are intermediates of anaerobic toluene mineralization to carbon dioxide, their methyl homologs can be either mineralization intermediates or cometabolic dead-end products of alkylbenzenes, depending on the bacteria involved. Benzoates are far more commonly reported in field studies of hydrocarbon-contaminated aquifers than are benzylsuccinates and E-phenylitaconates, although it is not clear whether this is an accurate representation of the relative occurrenceof these metabolites at contaminated sites, or whether it instead reflects the limited range of target analytes used in most field studies to date.

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  1. Lawrence Livermore National Laboratory, P.O. Box 808, L-542, Livermore, CA, 94551, USA.

    Harry R. Beller

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Beller, H.R. Metabolic indicators for detecting in situanaerobic alkylbenzene degradation. Biodegradation 11, 125–139 (2000). https://doi.org/10.1023/A:1011109800916

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