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Chapter 17 : Metabolic Indicators of Anaerobic Hydrocarbon Biodegradation in Petroleum-Laden Environments

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Abstract:

This chapter reviews the predominant metabolites that can be expected during anaerobic hydrocarbon decay. Many reviews have steadily detailed the state of the art of how various classes of petroleum hydrocarbons are metabolized in the absence of oxygen. The chapter presents a brief overview of that understanding particularly as it relates to anaerobic alkylbenzene, alkane, and polycyclic aromatic hydrocarbon (PAH) decay. The current understanding of anaerobic hydrocarbon decay stems from laboratory studies of isolates or enrichment cultures obtained from petroleum-contaminated environments. Authoritative reports recommend that multiple lines of evidence be collected to verify in situ biodegradation activity including (i) documenting the mass loss of contaminants from the field, (ii) laboratory investigations of contaminant biodegradability, and (iii) inferential field evidence demonstrating that in situ microbial activity is linked to contaminant degradation. Two recent reports have demonstrated the potential usefulness of push-pull tests to evaluate in situ hydrocarbon biotransformation rates. In the first, benzene, toluene, ethylbenzene, and xylene (BTEX) hydrocarbons were injected into an aquifer in the presence of nitrate or sulfate to evaluate hydrocarbon degradation and the production of signature benzylsuccinates. In a separate study, isotopically labeled substrates were used to evaluate the rates of in situ hydrocarbon biotransformation. The lessons to date indicate that while there is a substantial amount of phylogenetic and metabolic diversity, there are also some common metabolic themes. The recognition of these themes allows for the assay and detection of signature metabolites that attest to the transformation of hydrocarbons in a wide variety of environments.

Citation: Gieg L, Suflita J. 2005. Metabolic Indicators of Anaerobic Hydrocarbon Biodegradation in Petroleum-Laden Environments, p 337-356. In Ollivier B, Magot M (ed), Petroleum Microbiology. ASM Press, Washington, DC. doi: 10.1128/9781555817589.ch17

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Tables

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TABLE 1

Key mass spectral characteristics used to identify signature anaerobic hydrocarbon metabolites

Citation: Gieg L, Suflita J. 2005. Metabolic Indicators of Anaerobic Hydrocarbon Biodegradation in Petroleum-Laden Environments, p 337-356. In Ollivier B, Magot M (ed), Petroleum Microbiology. ASM Press, Washington, DC. doi: 10.1128/9781555817589.ch17

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