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Contribution of quinone-reducing microorganisms to the anaerobic biodegradation of organic compounds under different redox conditions.
Biodegradation. 2008 Apr; 19(2):235-46.B

Abstract

The capacity of two anaerobic consortia to oxidize different organic compounds, including acetate, propionate, lactate, phenol and p-cresol, in the presence of nitrate, sulfate and the humic model compound, anthraquinone-2,6-disulfonate (AQDS) as terminal electron acceptors, was evaluated. Denitrification showed the highest respiratory rates in both consortia studied and occurred exclusively during the first hours of incubation for most organic substrates degraded. Reduction of AQDS and sulfate generally started after complete denitrification, or even occurred at the same time during the biodegradation of p-cresol, in anaerobic sludge incubations; whereas methanogenesis did not significantly occur during the reduction of nitrate, sulfate, and AQDS. AQDS reduction was the preferred respiratory pathway over sulfate reduction and methanogenesis during the anaerobic oxidation of most organic substrates by the anaerobic sludge studied. In contrast, sulfate reduction out-competed AQDS reduction during incubations performed with anaerobic wetland sediment, which did not achieve any methanogenic activity. Propionate was a poor electron donor to achieve AQDS reduction; however, denitrifying and sulfate-reducing activities carried out by both consortia promoted the reduction of AQDS via acetate accumulated from propionate oxidation. Our results suggest that microbial reduction of humic substances (HS) may play an important role during the anaerobic oxidation of organic pollutants in anaerobic environments despite the presence of alternative electron acceptors, such as sulfate and nitrate. Methane inhibition, imposed by the inclusion of AQDS as terminal electron acceptor, suggests that microbial reduction of HS may also have important implications on the global climate preservation, considering the green-house effects of methane.

Authors+Show Affiliations

Departamento de Ciencias del Agua y del Medio Ambiente, Instituto Tecnológico de Sonora, Av. 5 de Febrero 818 Sur, Cd. Obregón, SON 85000, Mexico. fjcervantes@ipicyt.edu.mxNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17534721

Citation

Cervantes, Francisco J., et al. "Contribution of Quinone-reducing Microorganisms to the Anaerobic Biodegradation of Organic Compounds Under Different Redox Conditions." Biodegradation, vol. 19, no. 2, 2008, pp. 235-46.
Cervantes FJ, Gutiérrez CH, López KY, et al. Contribution of quinone-reducing microorganisms to the anaerobic biodegradation of organic compounds under different redox conditions. Biodegradation. 2008;19(2):235-46.
Cervantes, F. J., Gutiérrez, C. H., López, K. Y., Estrada-Alvarado, M. I., Meza-Escalante, E. R., Texier, A. C., Cuervo, F., & Gómez, J. (2008). Contribution of quinone-reducing microorganisms to the anaerobic biodegradation of organic compounds under different redox conditions. Biodegradation, 19(2), 235-46.
Cervantes FJ, et al. Contribution of Quinone-reducing Microorganisms to the Anaerobic Biodegradation of Organic Compounds Under Different Redox Conditions. Biodegradation. 2008;19(2):235-46. PubMed PMID: 17534721.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Contribution of quinone-reducing microorganisms to the anaerobic biodegradation of organic compounds under different redox conditions. AU - Cervantes,Francisco J, AU - Gutiérrez,Claudia H, AU - López,Kitzia Y, AU - Estrada-Alvarado,María Isabel, AU - Meza-Escalante,Edna R, AU - Texier,Anne-Claire, AU - Cuervo,Flor, AU - Gómez,Jorge, Y1 - 2007/05/30/ PY - 2007/01/11/received PY - 2007/04/25/accepted PY - 2007/5/31/pubmed PY - 2008/4/16/medline PY - 2007/5/31/entrez SP - 235 EP - 46 JF - Biodegradation JO - Biodegradation VL - 19 IS - 2 N2 - The capacity of two anaerobic consortia to oxidize different organic compounds, including acetate, propionate, lactate, phenol and p-cresol, in the presence of nitrate, sulfate and the humic model compound, anthraquinone-2,6-disulfonate (AQDS) as terminal electron acceptors, was evaluated. Denitrification showed the highest respiratory rates in both consortia studied and occurred exclusively during the first hours of incubation for most organic substrates degraded. Reduction of AQDS and sulfate generally started after complete denitrification, or even occurred at the same time during the biodegradation of p-cresol, in anaerobic sludge incubations; whereas methanogenesis did not significantly occur during the reduction of nitrate, sulfate, and AQDS. AQDS reduction was the preferred respiratory pathway over sulfate reduction and methanogenesis during the anaerobic oxidation of most organic substrates by the anaerobic sludge studied. In contrast, sulfate reduction out-competed AQDS reduction during incubations performed with anaerobic wetland sediment, which did not achieve any methanogenic activity. Propionate was a poor electron donor to achieve AQDS reduction; however, denitrifying and sulfate-reducing activities carried out by both consortia promoted the reduction of AQDS via acetate accumulated from propionate oxidation. Our results suggest that microbial reduction of humic substances (HS) may play an important role during the anaerobic oxidation of organic pollutants in anaerobic environments despite the presence of alternative electron acceptors, such as sulfate and nitrate. Methane inhibition, imposed by the inclusion of AQDS as terminal electron acceptor, suggests that microbial reduction of HS may also have important implications on the global climate preservation, considering the green-house effects of methane. SN - 0923-9820 UR - https://www.unboundmedicine.com/medline/citation/17534721/Contribution_of_quinone_reducing_microorganisms_to_the_anaerobic_biodegradation_of_organic_compounds_under_different_redox_conditions_ L2 - https://doi.org/10.1007/s10532-007-9130-x DB - PRIME DP - Unbound Medicine ER -