Glycine: Facilitating Delignification while Suppressing Cellulose Degradation During Corn Straw Pretreatment

Area of Science:

• Biomass Pretreatment
• Green Chemistry
• Biorefining

Background:

• Efficient biomass pretreatment is crucial for sustainable biofuel production.
• Lignin removal often leads to cellulose degradation, reducing overall yield.
• Developing eco-friendly pretreatment methods is a key challenge.

Purpose of the Study:

• To investigate the role of glycine in enhancing lignin removal and cellulose protection during biomass pretreatment.
• To optimize the [Bmim][DCA]-Gly pretreatment system for corn straw.
• To evaluate the efficiency and recyclability of the developed system.

Main Methods:

• Utilizing a [Bmim][DCA]-Gly ionic liquid system for corn straw pretreatment.
• Employing 25 wt % solids loading for efficient delignification.
• Analyzing lignin structure and cellulose integrity using ¹³C NMR and other techniques.
• Assessing saccharification yields with varying enzyme loadings.

Main Results:

• Achieved 78.11% delignification of corn straw with the [Bmim][DCA]-Gly system.
• Observed enhanced S-type lignin removal via hydrogen bonding and suppressed cellulose degradation.
• Reported a high cellulose recovery rate of 95.45% and a saccharification yield of 95.69%.
• Demonstrated successful recycling of the [Bmim][DCA]-Gly system four times with consistent efficiency.

Conclusions:

• The [Bmim][DCA]-Gly system provides an effective and green strategy for biomass pretreatment.
• Glycine plays a key role in promoting delignification and preserving cellulose integrity.
• This approach offers a sustainable pathway for biorefining and biofuel production.