Reaction scheme involved in the production of hydroxyl radical by white rot fungi via quinone redox cycling [33]. 1,4-benzoquinone (BQ) is reduced by quinone reductase (QR) producing hydroquinone (BQH2), which is oxidized by any of the lignin modifying enzymes to semiquinones . The production of superoxide anion radicals by autoxidation is mainly catalyzed by Fe3+ that is reduced to Fe2+. Fenton’s reagent formation is accomplished by O2-dismutation to H2O2.
