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Saccharification of Natural Lignocellulose Biomass and Polysaccharides by Highly Negatively Charged Heteropolyacids in Concentrated Aqueous Solution
Author(s) -
Ogasawara Yoshiyuki,
Itagaki Shintaro,
Yamaguchi Kazuya,
Mizuno Noritaka
Publication year - 2011
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201100025
Subject(s) - chemistry , cellulose , cellobiose , xylose , hydrolysis , levulinic acid , aqueous solution , arabinose , monosaccharide , xylan , lignocellulosic biomass , polysaccharide , starch , organic chemistry , cellulase , fermentation , catalysis
Abstract Highly negatively charged heteropolyacids (HPAs), in particular H 5 BW 12 O 40 , efficiently promoted saccharification of crystalline cellulose into water‐soluble saccharides in concentrated aqueous solutions (e.g., 82 % total yield and 77 % glucose yield, based on cellulose with a 0.7 M H 5 BW 12 O 40 solution); the performance was much better than those of previously reported systems with commonly utilized mineral acids (e.g., H 2 SO 4 and HCl) and HPAs (e.g., H 3 PW 12 O 40 and H 4 SiW 12 O 40 ). Besides crystalline cellulose, the present system was applicable to the selective transformation of cellobiose, starch, and xylan to the corresponding monosaccharides such as glucose and xylose. In addition, one‐pot synthesis of levulinic acid and sorbitol directly from cellulose was realized by using concentrated HPA solutions. The present system, concentrated aqueous solutions of highly negatively charged HPAs, was further applicable to saccharification of natural (non‐purified) lignocellulose biomass, such as “rice plant straw”, “oil palm empty fruit bunch (palm EFB) fiber”, and “Japanese cedar sawdust”, giving a mixture of the corresponding water‐soluble saccharides, such as glucose (main product), galactose, mannose, xylose, arabinose, and cellobiose, in high yields (≥77 % total yields of saccharides based on holocellulose). Separation of the saccharides and H 5 BW 12 O 40 was easy, and the retrieved H 5 BW 12 O 40 could repeatedly be used without appreciable loss of the high performance.