Figure 9.

Dilute acid pretreatment using 1% w/w sulfuric acid with 0.5% w/w solids concentration. Glucose and xylose sugar yields from co-hydrolysis compared with those from separate pretreatment and enzymatic hydrolysis (SPEH) for pretreatment of 0.5% w/w Populus slurries in 1% w/w sulfuric acid at 140°C followed by enzymatic hydrolysis over a range of enzyme loadings according to the same format as in Figure 6. The error bars represent the standard errors, based on three replicates.