Hydrothermal Pretreatment of Date Palm (Phoenix dactylifera L.) Leaflets and Rachis to Enhance Enzymatic Digestibility and Bioethanol Potential

Figure 6

Ethanol yield and corresponding ethanol concentration in SSF of solids from untreated and pretreated date palm leaflets and rachis. Enzymatic hydrolysis (10% DM) was conducted at 50°C for 72 h with Cellic CTec2 (15 FPU/g DM) and Cellic HTec2 (1/9 weight of Cellic CTec2). In SSF, enzymatic hydrolysis was conducted for 24 h prior to fermentation that was carried out at 32°C for 72 h with the yeast inoculation (S. cerevisiae) of 2 g/L.