By Rolf-Michael Wittich (auth.), Rolf-Michael Wittich (eds.)
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Additional resources for Biodegradation of Dioxins and Furans
Dechlorination occurred less readily under other pH-conditions. Dechlorination catalyzed by vitamin B12 was less effective: 10% of the amount of OCDD was dechlorinated of which 8% to TCDD (primarily 2,3,7,8TCDD). No TCDF was formed as a result of dechlorination of OCDF by vitamin BI2 and the dechlorination of OCDF was slower than that of OCDD. Cathechol, resorcinol and 3,4-dihydroxybenzoate were used as model organic electron shuttles. The dechlorination pattern was different from that with vitamin BI2 and a rapid increase of the 2,3,7,8-/l,4,6,9-substituted hepta- and hexa-chlorinated dioxin isomers occurred.
They did not propose a pathway based on their calculated results, but concluded by comparing the Gibbs free energies of the different dechlorination reactions of 1,2,3,4-TCDD to metabolites, that the predicted isomer ratios were only partly PCE-reductase46 Dehalogenase47 Coenz}'Il1e F430 50 ,51,53 (co metabolic) 3-CB-reductive dehalogenase49 Reductive dehalogenase44 (Co)enzyme coupled to ATP-production Methanogenic bacteria Desulfomile Tiedje DCB! 4. Enzymes and coenzymes involved in anaerobic dechlorination.
Recently, some reports have been published about changing isomer patterns in sediment cores during time, in which, for the first time, degradation of the dioxins and furans in the field is considered. This chapter reviews what is currently known about the biodegradation of dioxins and furans, under Biodegradation of Dioxins and Furans, edited by Rolf-Michael Wittich. G. Landes Company. 30 Biodegradation ofVi ox ins and Furans anoxic conditions, and what is known about the fate of dioxins in the field.