At the lower acid concentration (65–70 wt%), the production of glucose was less significant than of xylose as glucose was still existed in its oligomers form (cellobiose), indicating that xylose, the derivative of hemicellulose, was liberated at the higher production rate. However, the production of xylose was decreased with the increasing acid concentration, while the production of glucose started to increase when the acid concentration was increased, from 70 to 75 wt%.