Figure 6

Dilute acid pretreatment using 1% w/w sulfuric acid with 2.0% w/w solids concentration. Glucose and xylose yields from co-hydrolysis compared with those from separate pretreatment and enzymatic hydrolysis (SPEH) for pretreatment of 2% w/w Populus slurries in 1% w/w sulfuric acid at 140°C followed by enzymatic hydrolysis over a range of enzyme loadings from 15 + 5 to 105 + 35 mg of cellulase plus xylanase, respectively, per gram of glucan and xylan in the raw biomass. The eight stacked bars on the left show pretreatment for log CS of 1.5 and those on the right for log CS of 1.8. The representation format is the same as that described in Figure 2. The error bars represent the standard errors, based three replicates.