Optimum commercial enzyme mixture ratio-based Minitab model predicted contour plots for ternary combinations of CTec2, HTec2 and Multifect Pectinase. (I) DA, (II) IL and (III) AFEX pretreated corn stover at 0.2% glucan loading. (A) Glucan conversions are shown on the left and (B) xylan conversions are shown on the right. The total protein loading was 15 mg protein/g glucan. AFEX, ammonia fiber expansion; DA, dilute acid; IL, ionic liquid.