Effect of Fe(II) oxidation and Fe(III) chelation on enzymatic cellulolysis. The hydrolysis mixture included 43 g/liter PCS, 0.25 g/liter cellulase mix, and 50 mM Na-acetate (pH 5) at 50°C. Concentrations of inhibitor, oxidant, and chelator added to the hydrolysis suspension were 2.5 mM FeSO4, 10 mM H2O2, and 10 mM desferrioxamine.