Document Detail


Impact of ferrihydrite and anthraquinone-2,6-disulfonate on the reductive transformation of 2,4,6-trinitrotoluene by a gram-positive fermenting bacterium.
MedLine Citation:
PMID:  16201638     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Batch studies were conducted to explore differences in the transformation pathways of 2,4,6-trinitrotoluene (TNT) reduction by a Gram-positive fermenting bacterium (Cellulomonas sp. strain ES6) in the presence and absence of ferrihydrite and the electron shuttle anthraquinone-2,6-disulfonate (AQDS). Strain ES6 was capable of TNT and ferrihydrite reduction with increased reduction rates in the presence of AQDS. Hydroxylaminodinitrotoluenes, 2,4-dihydroxylamino-6-nitrotoluene (2,4-DHANT), and tetranitroazoxytoluenes were the major metabolites observed in ferrihydrite- and AQDS-free systems in the presence of pure cell cultures. Ferrihydrite enhanced the production of amino derivatives because of reactions with microbially produced surface-associated Fe(ll). The presence of AQDS in the absence of ferrihydrite promoted the fast initial formation of arylhydroxylamines such as 2,4-DHANT. However, unlike in pure cell systems, these arylhydroxylamines were transformed into several unidentified polar products. When both microbially reduced ferrihydrite and AQDS were present simultaneously, the reduction of TNT was more rapid and complete via pathways thatwould have been difficult to infer solely from single component studies. This study demonstrates the complexity of TNT degradation patterns in model systems where the interactions among bacteria, Fe minerals, and organic matter have a pronounced effect on the degradation pathway of TNT.
Authors:
Thomas Borch; William P Inskeep; Jace A Harwood; Robin Gerlach
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-05     Completed Date:  2005-12-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7126-33     Citation Subset:  IM    
Affiliation:
Center for Biofilm Engineering, Montana State University, Bozeman, Montana 59717, USA. borch@stanford.edu
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MeSH Terms
Descriptor/Qualifier:
Anthraquinones / analysis*,  pharmacology
Biodegradation, Environmental
Cellulomonas / enzymology*
Culture Media / pharmacology
Environment
Fermentation
Ferric Compounds / analysis,  pharmacology*
Gram-Positive Bacteria / metabolism*
Hydroxylamines / analysis
Iron / analysis,  metabolism
Models, Chemical
Oxygen / metabolism
Sucrose / analysis
Time Factors
Trinitrotoluene / analysis*
Waste Disposal, Fluid
Water / analysis*
Water Microbiology
Water Purification / methods*
Chemical
Reg. No./Substance:
0/Anthraquinones; 0/Culture Media; 0/Ferric Compounds; 0/Hydroxylamines; 0/anthraquinone-2,6-disulfonate; 118-96-7/Trinitrotoluene; 39473-89-7/ferrihydrite; 57-50-1/Sucrose; 7439-89-6/Iron; 7732-18-5/Water; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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