Keywords: 
• Rhodopseudomonas palustris /
•  Reactive Black 5 /
• decolorization metabolites /
• redox mediators /
• biodecolorization

Abstract: The effects of decolorization metabolites (DM) of Reactive Black 5 (RB5) from Rhodopseudomonas palustris W1 on the biodecolorization of RB5 under anaerobic condition were investigated. The results indicated that DM significantly enhanced the decolorization rate of RB5 and the growth rate of W1 DM of different concentration RB5 played a crucial role for stimulating decolorization, in which DM of 200 mg/L RB5 brought the highest effect, and accelerated the decrease of ORP as well. Stimulation of decolorization of anaerobic sludge by DM was similar to decolorization of W1, but it differed in that DM would slightly inhibit the growth of bacteria in anaerobic sludge. Cyclic voltammogram of DM showed that pair current peaks of reversible oxidation and reduction appeared at potential of 83 and -200 mV, respectively, indicating DM may present as redox mediators to enhance the RB5 decolorization. Comparison of cyclic voltammogram of RB5 solution, DM, and extracellular metabolites (EM) of the strain W1 further demonstrats that the redox mediators existing in the DM of RB5 decolorizaiton, namely RB5 play the role of autocatalysis in the process of an anaerobic biodecolorization. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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