Influence of aromatic substitution patterns on azo dye degradability by Streptomyces spp. and Phanerochaete chrysosporium

Article Abstract:

Seventeen azo compounds were synthesized and used as substrates for degradation of Phanerochaete chrysosporium and Streptomyces spp. to determine the influence of aromatic substitution patterns on azo dye degradation. The results showed that aromatic substitutions could enhance the biodegradability of azo dyes. Peroxidase enzymes were identified asresponsible for the initial steps in this degradative process. In addition, it was shown that specific azo dyes could be used to differentiate fungal Mn(II) peroxidase from ligninase.

Streptomyces, Peroxidase, Azo compounds

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Degradation of phenanthrene by Phanerochaete chrysosporium occurs under ligninolytic as well as nonligninolytic conditions

Article Abstract:

The degradation of phenanthrene, a polycyclic aromatic hydrocarbon, by Phanerochaete chrysosporium was elucidated. The experiments involved the analysis of the abilities of wild-type and non-lignin-degrading mutants of P. chrysosporium to degrade phenanthrene. The results showed that P. chrysosporium is able to degrade phenanthrene without the activities of lignin and manganese peroxidase. The results suggest that bioremediation efforts using P. chrysosporium is not limited by the presence of lignin.

Polycyclic aromatic hydrocarbons

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Oxidative degradation of phenanthrene by the ligninolytic fungus Phanerochaete chrysosporium

Article Abstract:

The pathway for phenanthrene degradation in Phanerochaete chrysosporium was elucidated. Chromatographic and isotope dilution experimants identified 2,2'- diphenic acid (DPA) as the major product of phenanthrene degradation. DPA was also produced from the degradation of phenanthrene-9,10-quinone (PQ). The reaction involved oxidation at the C-9 and C-10 positions. The results suggest that the pathway for phenanthrene degradation proceeds from phenanthrene to PQ to DPA.

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