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Decolorization of six synthetic dyes using three sources of fungal laccase with the origin of  Aspergillus oryzae ,  Trametes versicolor , and  Paraconiothyrium variabile  was investigated. Among them, the enzyme from  P. variabile  was the most efficient which decolorized bromophenol blue (100%), commassie brilliant blue (91%), panseu-S (56%), Rimazol brilliant blue R (RBBR; 47%), Congo red (18.5%), and methylene blue (21.3%) after 3 h incubation in presence of hydroxybenzotriazole (HBT; 5 mM) as the laccase mediator. It was also observed that decolorization efficiency of all dyes was enhanced by increasing of HBT concentration from 0.1 mM to 5 mM. Laccase from  A. oryzae  was able to remove 53% of methylene blue and 26% of RBBR after 30 min incubation in absence of HBT, but the enzyme could not efficiently decolorize other dyes even in presence of 5 mM of HBT. In the case of laccase from  T. versicolor , only RBBR was decolorized (93%) in absence of HBT after 3 h incubation.

Synthetic dye decolorization by three sources of fungal laccase