Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7062827 | Biomass and Bioenergy | 2018 | 9 Pages |
Abstract
Hemicellulosic hydrolysate of switchgrass, pre-treated with dilute sulfuric acid, was assessed for butanol production via acetone-butanol-ethanol (ABE) fermentation. Clostridium beijerinckii CECT 508 was selected among eight wild strains as the most efficient to produce butanol from glucose/xylose mixtures. The effects of inhibitory compounds from the acid hydrolysate on ABE fermentation were studied using model fermentation media, observing that the most harmful inhibitors were acetic acidâ¯>â¯phenolic compoundsâ¯>â¯sulfateâ¯>â¯furfural, while 5-HMF and levulic acid seemed to have no effect. Several detoxification treatments, including evaporation, overliming and activated charcoal adsorption, were evaluated to remove inhibitors from switchgrass acid hydrolysate. Although activated charcoal was the most effective method, there were no significant differences in butanol production between non-detoxified and detoxified hydrolysates. The non-detoxified switchgrass acid hydrolysate (containing 26â¯gâ¯Lâ1 xylose, 4â¯gâ¯Lâ1 glucose and 4â¯gâ¯Lâ1 arabinose) was successfully fermented by C. beijerinckii CECT 508, obtaining 4.00â¯Â±â¯0.71â¯gâ¯Lâ1 butanol (yield 0.184â¯Â±â¯0.032â¯gâ¯gâ1). To the best of our knowledge, this is the first time that a hydrolysate obtained from switchgrass has been efficiently fermented to butanol without previous enzymatic hydrolysis or detoxification steps, using a non-genetically modified Clostridium strain.
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Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Ana I. Paniagua-GarcÃa, MarÃa Hijosa-Valsero, Rebeca DÃez-AntolÃnez, Marta E. Sánchez, Mónica Coca,