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One laccase-secreting engineered strain and four white-rot fungi were tested for their capacity to decolorize nine dyes that could be classified as azo, anthraquinonic and triphenylmethane dyes. Trametes versicolor was the most efficient of the tested strains under these experimental conditions. Anthraquinonic dyes were decolorized more easily than the other two types. Small structural differences among the dyes could significantly affect decolorization. None of the strains showed lignin peroxidase or veratryl alcohol oxidase activity. None of the dyes were decolorized completely by laccase alone. It is likely that other phenoloxidases, such as Mn-dependent and versatile peroxidase, were also involved in decolorization of the dyes.
Liu et al. (Mon,) studied this question.