Figure 4

Enzymatic digestibility of filter paper and cotton linter residues after different pretreatments. (A) Glucose yield from filter paper (FP) and (B) glucose yield from cotton linter (CL) during 24 to 168 hours of enzymatic hydrolysis. The pretreatments for the biomass included dilute acid/iron cocatalyst (0.5 wt% H₂SO₄ + 5 mM FeSO₄), dilute acid alone (0.5 wt% H₂SO₄) and iron alone (5 mM FeSO₄). For comparison purposes, the enzymatic hydrolysis of non-pre-treated FP and CL are also presented as "absolute" controls. Values are presented as means ± SE of glucose conversion (%) from three replicate experiments.