The dye-decolorizing potential of immobilized and free laccase
from C. gallica was demonstrated for different textile dyes
belonging to 3 dye families: an anthraquinone dye (RBBR), diazo
dyes (RB-5 and BBR) and a complex metal dye (LG) (Fig. 5aed).
From data in Fig. 5a, it can be observed that RBBR was rapidly
decolorized by both the free and immobilized laccase alone,
compared to LG, RB5 and BBR (Fig. 5bed). For the diazo and the
complex metal dye, the maximum decolorization yields obtained
were not higher than 50% within 24 h of incubation without redox
mediators, whereas they were more efficient in the presence of HBT
(Fig. 5bed).