In a comparative study for pretreatment technologies to sugar recovery from corn stover (Wyman et al. (2005b) suggested that each pretreatment made it possible to subsequently achieve high yields of glucose from cellulose by cellulose enzymes, and the cellulase formulations used were effective in solubilizing residual xylan left in the solids after each pretreatment. Thus, overall sugar yields from hemicellulose and cellulose in the coupled pretreatment and enzymatic hydrolysis operations were high for all of the pretreatments with corn stover