Comparison of the impact of ionic liquid pretreatment on recalcitrance of agave bagasse and switchgrass

► Assessment of the potential of agave bagasse as a biofuel feedstock using ionic liquid (IL) pretreatment. ► The total sugar yield was higher for agave bagasse (AGB) than for switchgrass (SWG). ► The initial enzymatic hydrolysis rate was lower for AGB than for SWG. ► Pretreatment resulted in higher...

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Bibliographic Details
Published in:	Bioresource technology 2013-01, Vol.127, p.18-24
Main Authors:	Perez-Pimienta, Jose A., Lopez-Ortega, Monica G., Varanasi, Patanjali, Stavila, Vitalie, Cheng, Gang, Singh, Seema, Simmons, Blake A.
Format:	Article
Language:	eng
Subjects:	Agave - chemistry Agave bagasse Bagasse Biofuels Biological and medical sciences Biomass Biomass pretreatment Cellulose - chemistry Enzymes Feedstock Food industries Fuels Fundamental and applied biological sciences. Psychology Glucans - analysis Ionic liquid Ionic liquids Ionic Liquids - chemistry Lignin - analysis Panicum - chemistry Pretreatment Spectroscopy, Fourier Transform Infrared Sugars Switchgrass Temperature Use and upgrading of agricultural and food by-products. Biotechnology X-Ray Diffraction Xylans - analysis
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Summary:	► Assessment of the potential of agave bagasse as a biofuel feedstock using ionic liquid (IL) pretreatment. ► The total sugar yield was higher for agave bagasse (AGB) than for switchgrass (SWG). ► The initial enzymatic hydrolysis rate was lower for AGB than for SWG. ► Pretreatment resulted in higher delignification for AGB (45.5%) than for SWG (38.4%). ► XRD patterns showed highly crystalline peaks for AGB which decreased with pretreatment. Lignocellulose represents a sustainable source of carbon for transformation into biofuels. Effective biomass to sugar conversion strategies are needed to lower processing cost without degradation of polysaccharides. Since ionic liquids (ILs) are excellent solvents for pretreatment/dissolution of biomass, IL pretreatment was carried out on agave bagasse (AGB-byproduct of tequila industry) and digestibility and sugar yield was compared with that obtained with switchgrass (SWG). The IL pretreatment was conducted using ([C2mim][OAc]) at 120 and 160°C for 3h and 15% biomass loading. While pretreatment using [C2mim][OAc] was very effective in improving the digestibility of both feedstocks, IL pretreatment at 160°C resulted in higher delignification for AGB (45.5%) than for SWG (38.4%) when compared to 120°C (AGB-16.6%, SWG-8.2%), formation of a highly amorphous cellulose structure and a significant enhancement of enzyme kinetics. These results highlight the potential of AGB as a biofuel feedstock that can produce high sugar yields with IL pretreatment.
ISSN:	0960-8524 1873-2976