Fig. 3. The concentrations of ethanol (h), glucose (j), xylose (N) during SSF experiments for corn cobs at 7.5% dry matter after different pretreatment methods. (a) SAA pretreated corncob, (b) FA–AA pretreated corncob, (c) FA–AA pretreated corncob, and (d) H2SO4–NaOH pretreated corncob