Activation of microcrystalline cellulose in a CO(2)-based switchable system

Area of Science:

• Green Chemistry
• Biomass Processing
• Materials Science

Background:

• Microcrystalline cellulose (MCC) is a widely used biopolymer but its recalcitrance to hydrolysis limits its applications.
• Developing efficient and sustainable methods for MCC processing is crucial for biomass valorization.

Purpose of the Study:

• To investigate the use of CO2-based switchable solvent systems for dissolving and regenerating MCC.
• To reduce the crystallinity and recalcitrance of MCC for improved downstream processing.

Main Methods:

• Dissolving MCC in a CO2-based switchable solvent system at room temperature.
• Regenerating MCC from the solvent system.
• Characterizing the changes in MCC crystallinity and recalcitrance using techniques such as X-ray diffraction and hydrolysis assays.

Main Results:

• A CO2-based switchable solvent system was developed capable of dissolving up to 15 wt% MCC within 1 hour at room temperature.
• The dissolution and regeneration process significantly reduced the crystallinity index of MCC.
• Reduced crystallinity led to decreased recalcitrance to hydrolysis.

Conclusions:

• CO2-based switchable solvents offer a promising and sustainable approach for modifying MCC.
• This method effectively reduces MCC recalcitrance, enhancing its potential for various applications, including biofuel production and biomaterial development.