2.7- dichlorodibenzo dioxin degradation

Valli K, H Wariishi, MH Gold (1992b) Degradation of 2,7-dichlorodibenzo- -dioxin by the lignin-degrading hasidiomycete Phanerochaete chrysosporium. J Bacteriol 174 2131-2137. 

Valli, K., Wariishi, H. Gold, M. H. (1992). Degradation of 2,7-dichlorodibenzo-/>-dioxin by the lignin-degrading basidiomycete Phanerochaete chrysosporium. Journal of Bacteriology, 174, 2131-7-... 

Several facts have emerged from our studies with 2,7-DCDD and 2,3,7,8-TCDD. They are not biosynthesized by condensation of chloro-phenols in soils, and they are not photoproducts of 2,4-dichlorophenol. They do not leach into the soil profile and consequently pose no threat to groundwater, and they are not taken up by plants from minute residues likely to occur in soils. Photodecomposition is insignificant on dry soil surfaces but is probably important in water. Dichlorodibenzo-p-dioxin is lost by volatilization, but TCDD is probably involatile. These compounds are not translocated within the plant from foliar application, and they are degraded in the soil. 

FIGURE 10.41 Degradation of 2,3-dichlorodibenzo[l,4]dioxin. (From Neilson, A.H. and Allard, A.-S., The Handbook of Environmental Chemistry, Vol. 3J, pp. 1-80, Springer, Heidelberg, 1998. With permission.)... 

Trihydroxybenzene is an intermediate in the degradation by Phanerochaete chrysosporium of vanillate, 2,4-dichlorophenol, 2,4-dinitrophenol, and 2,7-dichlorodibenzo[l,4]dioxin (Chapter 6, Sections 6.5.2,6.8.2 and 6.3.2, respectively), and its degradation is mediated by a dioxygenase that carries out intradiol ring fission (Rieble et al. 1994). 

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