Cellulose hydrolysis by immobilized Trichoderma reesei cellulase

Area of Science:

• Biotechnology
• Enzyme Engineering
• Biomass Conversion

Background:

• Cellulose hydrolysis is key for biofuel production.
• Improving enzyme efficiency and reusability is crucial for economic viability.
• Ionic liquids offer potential as reaction media for enzymatic processes.

Purpose of the Study:

• To investigate cellulose hydrolysis using immobilized Trichoderma reesei cellulase.
• To optimize the preparation of carrier-free immobilized cellulase (CFIC).
• To evaluate the effect of the ionic liquid EMIM-DEP on hydrolysis rate and enzyme reusability.

Main Methods:

• Optimized preparation of carrier-free immobilized cellulase (CFIC) by adjusting cross-linker concentration and precipitant type.
• Investigated cellulose hydrolysis in the presence of 1-ethyl-3-methylimidazolium diethyl phosphate (EMIM-DEP).
• Assessed initial reaction rates, glucose yield, and enzyme reusability over multiple cycles.

Main Results:

• Optimized CFIC preparation was achieved.
• Addition of 2% (v/v) EMIM-DEP increased the initial hydrolysis rate by 2.7 times compared to no ionic liquid.
• Achieved an initial glucose yield of 0.7 g/g cellulose after 2 hours.
• CFIC demonstrated effective reusability over five hydrolysis cycles.

Conclusions:

• The ionic liquid EMIM-DEP significantly enhances the rate of cellulose hydrolysis by immobilized Trichoderma reesei cellulase.
• Carrier-free immobilized cellulase (CFIC) is an efficient and reusable biocatalyst for cellulose conversion.
• This approach holds promise for improving the economics of lignocellulosic biomass utilization.