Effect of mediator concentration on dye decolorization (%) by P. cinnabarinus laccase (2-h treatment of 25 μM Reactive Black 5 monitored at 598 nm). Mediators: ▪, acetosyringone; ▴, syringaldehyde; +, 2,4,6-trimethoxyphenol; •, vanillin; ♦, p-coumaric acid.