Microbial dechlorination of historically present and freshly spiked chlorinated dioxins and diversity of dioxin-dechlorinating populations.

Applied and Environmental Microbiology
A L Barkovskii, Peter Adriaens

Abstract

The ability of a microbial consortium eluted from dioxin-contaminated Passaic River sediments to dechlorinate polychlorinated dibenzo-p-dioxins (PCDDs) was investigated under methanogenic conditions. Aged 2,3,7,8-tetraCDD, which had partitioned into the microbial consortium from sediments, was stoichiometrically converted to tri- and monoCDD congeners. During dechlorination, dominant microbial activity within the consortium shifted from methanogenic to nonmethanogenic activity. Freshly spiked octaCDD was converted to hepta-, hexa-, penta-, tetra-, tri-, di-, and monochlorinated isomers, but the reaction stoichiometry was not determined. No methanogenic activity was observed, and the maximum yield of protein coincided with the production of less-chlorinated DD congeners. Two distinct pathways of dechlorination were observed: the peri-dechlorination pathway of 2,3,7,8-substituted hepta- to pentaCDDs, resulting in the production of 2,3,7,8-tetraCDD, and the peri-lateral dechlorination pathway of non-2,3,7,8-substituted congeners. Direct evidence of further lateral dechlorination of 2,3,7,8-tetraCDD was obtained from the historically contaminated incubations; no isomer-specific identification of triCDDs in spiked incubations was de...Continue Reading

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Citations

Jul 28, 2004·Archives of Microbiology·Manuela GesellFrieder Schauer
Jul 21, 2009·Applied Microbiology and Biotechnology·Michael Bunge, Ute Lechner
Jan 21, 2015·Journal of Environmental Quality·W C LinJ K Liu
Nov 9, 2014·Applied and Environmental Microbiology·Marlén PöritzUte Lechner
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Jul 17, 2008·Environmental Microbiology·Michael BungeUte Lechner
Nov 26, 2019·Environmental Science & Technology·Hang T DamMax M Häggblom
Dec 29, 2020·Environmental Toxicology and Chemistry·Michael J BockJennifer L Bell
Jan 1, 1997·Biotechnology Advances·P V Bünz, S Schmidt
Aug 11, 2017·Environmental Science & Technology·Lisa A RodenburgDonna E Fennell
Dec 18, 2007·Chemosphere·Jim A Field, Reyes Sierra-Alvarez
Feb 19, 2004·Environmental Science & Technology·Nicholas J L GreenKevin C Jones
Apr 13, 2004·Environmental Science & Technology·Noémi BarabásPierre Goovaerts

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