Journal
GREEN CHEMISTRY
Volume 16, Issue 5, Pages 2454-2462Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4gc00168k
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Funding
- Alexander von Humboldt Foundation
- Federal Ministry of Education and Research
- Max Planck Society
- ERC Advanced Grant
- Excellence Initiative by the German federal and state governments to promote science and research at German universities
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Recently, we demonstrated the mechanocatalytic depolymerization of lignocellulosic substrates as a powerful methodology that fully converts lignocellulosic substrates into 'water-soluble lignocellulose'. We now show that the saccharification of the aqueous solution of depolymerized beechwood, pinewood and sugarcane bagasse (at 140 degrees C for 1 h) produces a high yield of sugars (e.g. 88-92% glucose, 3.5-8% glucose dimers and 93-98% xylose relative to the glucan and xylan fractions, respectively) and leads to precipitation of sulfur-free lignins. Noteworthy, the formation of furfurals is suppressed because the 'water-soluble lignocelluloses' undergo hydrolysis at relatively low temperatures. At 140 degrees C, 5-hydroxymethylfurfural and furfural are formed in yields not exceeding 1.4 and 5.7%, respectively. The separation of the carbohydrate fraction (as C-5 and C-6 sugars) from the lignin fraction is thus feasible by simple filtration.
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