Enhancing biomass enzymatic hydrolysis performance by modified DES lignin

Area of Science:

• Biomass Conversion and Biorefining
• Enzyme Engineering
• Sustainable Chemistry

Background:

• Enzymatic hydrolysis of lignocellulose faces challenges with high production costs and low cellulase efficiency.
• Lignin, a major component of lignocellulose, often inhibits enzymatic hydrolysis, increasing costs.
• Developing cost-effective methods to improve lignocellulose breakdown is crucial for biofuel and biochemical production.

Purpose of the Study:

• To enhance glucose release from lignocellulose by modifying recovered lignin.
• To investigate the mechanism by which modified lignin improves enzymatic hydrolysis efficiency.
• To reduce the overall cost of lignocellulose enzymatic hydrolysis through lignin modification.

Main Methods:

• Recovered lignin was modified by grafting acrylamide and acryloyl chloride.
• Enzymatic hydrolysis experiments were conducted on dilute-acid-pretreated wheat straw using modified lignin.
• The interaction between modified lignin and cellulase was analyzed using binding constants and structural stability assessments (e.g., alpha-helix content).

Main Results:

• Modified lignin significantly increased glucose yield by 158% compared to the control.
• The binding constant of lignin to cellulase was reduced after modification.
• Modified lignin enhanced the alpha-helix content of cellulase, leading to a more compact and stable enzyme structure.

Conclusions:

• Grafting acrylamide and acryloyl chloride onto lignin effectively enhances glucose release during enzymatic hydrolysis.
• Modified lignin improves cellulase efficiency by increasing enzyme stability and reducing unproductive adsorption.
• This approach offers a promising strategy to reduce cellulase costs and improve the economic viability of lignocellulose biorefining.