Effect of hemicellulase addition during enzymatic hydrolysis of switchgrass pretreated by soaking in aqueous ammonia

► Glucose yields from switchgrass were modeled for four SAA pretreatment conditions. ► Hemicellulase addition resulted in glucose yields over 85% after SAA pretreatment. ► High glucose yields are possible with SAA under a range of temperatures and times. ► SAA conditions resulting in highest delignification did not have highest yields. ► Hemicellulase addition did not improve yields beyond 80% for mild SAA treatment.