FIG. 7.

Hydroxyl radical production by selected white-rot fungi via DBQ redox cycling. Levels of DBQ (A), DBQH₂ (B), and TBARS (C) are shown. The incubation mixtures contained 50 ml 20 mM phosphate buffer, pH 5; 200 ± 12 mg 10-day-old mycelia from B. adusta, P. chrysosporium, P. radiata, P. cinnabarinus, and T. versicolor; 500 μM DBQ; 100 μM Fe³⁺-110 μM EDTA; and 2.8 mM 2-deoxyribose. TBARS levels were corrected from those found in incubation blanks without DBQ. The error bars indicate standard deviations.