[Optimization of corn stover hydrolysis by fed-batch process]

Area of Science:

• Biotechnology
• Biochemical Engineering

Context:

• Cellulosic ethanol production requires efficient methods for converting biomass into fermentable sugars.
• Corn stover is an abundant lignocellulosic feedstock with potential for biofuel production.
• Enzymatic hydrolysis is a key step in breaking down biomass polysaccharides into sugars.

Purpose:

• To optimize the fed-batch enzymatic hydrolysis process for high-concentration sugar production from pretreated corn stover.
• To investigate the effects of key process parameters on saccharification rate and yield.

Summary:

• A fed-batch enzymatic hydrolysis process was developed for pretreated corn stover.
• Optimized conditions included an initial solid-to-liquid ratio of 20% (W/V) and specific enzyme concentrations (xylanase, cellulase, pectinase).
• Subsequent additions of corn stover and enzymes at 24 and 48 hours increased the final reducing sugar concentration to 138.5 g/L, a significant improvement over non-fed-batch methods.

Impact:

• Demonstrates the effectiveness of fed-batch processing for enhancing sugar yields in lignocellulosic biomass conversion.
• Provides a pathway for more efficient and cost-effective cellulosic ethanol production.
• Achieved a 62.5% hydrolysis yield of the theoretical value, highlighting process efficiency.