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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVED FORAGE AND BIOENERGY PLANTS AND TECHNOLOGIES FOR THE CENTRAL USA

Location: Grain, Forage, and Bioenergy Research

Title: Comparison of Dilute Acid and Ionic Liquid Pretreatment of Switchgrass: Biomass Recalcitrance, Delignification and Enzymatic Saccharification)

Author
item Li, Chenlin
item Knierim, Bernard
item Manisseri, Chithra
item Arora, Rohit
item Scheller, Henrik
item Auer, Manfred
item Vogel, Kenneth
item Simmons, Blake
item Singh, Seema

Submitted to: Bioresource Technology
Publication Type: Peer reviewed journal
Publication Acceptance Date: 10/23/2009
Publication Date: 11/30/2009
Publication URL: http://hdl.handle.net/10113/45259
Citation: Li, C., Knierim, B., Manisseri, C., Arora, R., Scheller, H.V., Auer, M., Vogel, K.P., Simmons, B., Singh, S. 2009. Comparison of Dilute Acid and Ionic Liquid Pretreatment of Switchgrass: Biomass Recalcitrance, Delignification and Enzymatic Saccharification. Bioresource Technology. 101:4900-4906. doi:10.1016/j.biortech.2009.10.066.

Interpretive Summary: The efficiency of two biomass pretreatment methods, dilute acid hydrolysis and dissolution by an ionic liquid were compared for their efficiency in producing fermentable sugars from switchgrass biomass. Ionic liquids pretreatment significantly increased the rate of enzyme activity resulting in almost 96% of theoretical glucose yield from cell wall cellulose in 24 hours. Although ionic liquids have unique advantages when compared to the dilute acid pretreatment process, currently the cost of the ionic liquid needs to be considered.

Technical Abstract: The efficiency of two biomass pretreatment technologies, dilute acid hydrolysis and dissolution in an ionic liquid, are compared in terms of delignification, saccharification efficiency and saccharide yields with switchgrass serving as a model bioenergy crop. When subject to ionic liquid pretreatment (dissolution and precipitation of cellulose by antisolvent) switchgrass exhibited reduced cellulose crystallinity, increased surface area, and decreased lignin content compared to dilute acid pretreatment. Pretreated material was characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy and chemistry methods. Ionic liquid pretreatment enabled a significant enhancement in the rate of enzyme hydrolysis of the cellulose component of switchgrass, with a rate increase of 16.7-fold, and a glucan yield of 96.0% obtained in 24 h. These results indicate that ionic liquid pretreatment may offer unique advantages when compared to the dilute acid pretreatment process for switchgrass. However, the cost of the ionic liquid process must also be taken into consideration.

Last Modified: 8/24/2016
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