Figure 5: Time courses of xylose concentration in second step EFB hydrolysis at different acid concentrations. □: 2% (w/v) H_{2}SO_{4} and 0.8% (w/v) H_{3}PO_{4}; ▲: 2.5% (w/v) H_{2}SO_{4} and 1% (w/v) H_{3}PO_{4}; ○: 3% (w/v) H_{2}SO_{4} and 1.2% (w/v) H_{3}PO_{4}. Other conditions: liquid to solid ratio 3 mL/g, 130°C. 
