Two-step hydrolysis of Japanese beech [Fagus crenata] as treated by semi-flow hot-compressed water

• Published in: Journal of wood science Vol. 55; no. 5; pp. 367 - 375
• Main Authors: Lu, X.(Kyoto Univ. (Japan)), Yamauchi, K, Phaiboonsilpa, N, Saka, S
• Format: Journal Article
• Language: English
• Published: Tokyo Japan : Springer Japan 01.10.2009; Springer Japan; Springer Nature B.V
• Subjects: Acetic acid; AGUA; Beech; Biomedical and Life Sciences; CELLULOSE; CELULOSA; Characterization and Evaluation of Materials; Crystalline cellulose; Dehydration; EAU; erythrose; FAGUS CRENATA; FARINE DE BOIS; Furfural; glucose; glucuronic acid; HARINA DE MADERA; HEAT TREATMENT; HEMICELLULOSE; HEMICELULOSA; HIDROLISIS; HIGH PRESSURE TECHNOLOGY; Hot-compressed water; HYDROLYSE; HYDROLYSIS; Hydroxymethylfurfural; Life Sciences; Lignin; LIGNINAS; LIGNINE; LIGNINS; Materials Science; Oligosaccharides; Organic acids; Original Article; TECHNOLOGIE HAUTE PRESSION; TECNOLOGIA ALTA PRESION; TRAITEMENT THERMIQUE; TRATAMIENTO TERMICO; WATER; WOOD FLOUR; Wood Science & Technology; xylooligosaccharides; Xylose; Lignin; Hemicellulose; Japanese beech; Hot-compressed water; Cellulose
• ISSN: 1435-0211; 1611-4663; 1611-4663
• DOI: 10.1007/s10086-009-1040-6

A two-step hydrolysis of Japanese beech (Fagus crenata) was conducted by semi-flow treatment with hot-compressed water. The first treatment stage was conducted at 230degC/10 MPa for 15 min and the second at 270degC/10 MPa for 15 min. Hemicellulose and lignin were found to be hydrolyzed in the first stage, while crystalline cellulose was hydrolyzed in the second stage. The treatment solubilized 95.6% of the Japanese beech wood flour into water with 4.4% remaining as water-insoluble residue, which was composed mainly of lignin. Hydrolysis products from the first stage were xylose and xylo-oligosaccharides, glucuronic acid and acetic acid from O-acetyl-4-O-methylglucuronoxylan, and hydrolyzed monomeric guaiacyl and syringyl units and their dimeric condensed-type units from lignin. Products from the second hydrolysis stage were glucose and cello-oligosaccharides from cellulose. The dehydrated products levoglucosan, 5-hydroxymethylfurfural (5-HMF), and furfural, as well as fragmented products glycolaldehyde, methylglyoxal, and erythrose, were recovered in the first stage from hemicellulose, and to a greater extent in the second stage from cellulose. Furthermore, organic acids such as glycolic, formic, acetic, and lactic acids were recovered in both stages. Based on these lines of evidence, decomposition pathways of O-acetyl-4-O-methylglucuronoxylan and cellulose are independently proposed.