Document Detail


Debromination of polybrominated diphenyl ether congeners BDE 99 and BDE 183 in the intestinal tract of the common carp (Cyprinus carpio).
MedLine Citation:
PMID:  14998018     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Polybrominated diphenyl ether (PBDE) congener patterns in biota are often enriched in tetra-, penta-, and hexabrominated diphenyl ethers, which is believed to result from the use of the commercial "pentaBDE" formulation. However, our evidence suggests that debromination of PBDEs occurs within fish tissues leading to appreciable accumulation of less brominated congeners. This suggests that PBDE body burdens can reflect both direct uptake from exposure and debromination of more highly brominated congeners. We conducted two independent dietary exposure studies using the common carp (Cyprinus carpio) to trace the fate of 2,2',4,4',5-pentabromodiphenyl ether (BDE 99) and 2,2',3,4,4',5',6-heptabromodiphenyl ether (BDE 183) in fish tissues. Carp were fed food spiked with individual BDE congeners for 62 d, and depuration was monitored during the following 37 d. Significant debromination was observed, converting BDE 99 to 2,2',4,4'-tetrabromodiphenyl ether (BDE47) and BDE 183 to 2,2',4,4',5,6-hexabromodiphenyl ether (BDE 154) and another as yet unidentified hexa-BDE congener. The BDE 99 concentration rapidly declined from 400 +/- 40 ng/g ww in the food to 53 +/- 12 ng/g ww in the gut content material sampled 2.5 +/- 1 h following feeding. At least 9.5 +/- 0.8% of the BDE 99 mass in the gut was debrominated to BDE 47 and assimilated in carp tissues. In the BDE 183 exposure, approximately 17% of the BDE 183 mass was debrominated and accumulated in carp tissues in the form of two hexa-BDE congeners. In both exposure studies, the concentration of the exposure compound decreased significantly in the gut within 2.5 +/- 1 h following ingestion. This rapid decrease in the concentration of the BDE congeners could not be explained entirely by debromination to quantified products or fecal egestion. Reactions occurring within the gut transform BDE congeners to other products that may accumulate or be excreted. Further studies are needed to identify and determine the effects of these BDE metabolites.
Authors:
Heather M Stapleton; Robert J Letcher; Joel E Baker
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science & technology     Volume:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-03-04     Completed Date:  2004-04-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1054-61     Citation Subset:  IM    
Affiliation:
Chesapeake Biological Laboratory, University of Maryland, Center for Environmental Science, Solomons, Maryland 20688, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Biotransformation
Bromine / chemistry
Carps / physiology*
Digestive System / chemistry
Halogenated Diphenyl Ethers
Phenyl Ethers / metabolism*,  pharmacokinetics
Water Pollutants, Chemical / metabolism*,  pharmacokinetics
Chemical
Reg. No./Substance:
0/2,2',3,4,4',5',6-heptabromodiphenyl ether; 0/2,2',4,4',5-brominated diphenyl ether; 0/Halogenated Diphenyl Ethers; 0/Phenyl Ethers; 0/Water Pollutants, Chemical; 7726-95-6/Bromine

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


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