NDLI: Two-step hydrolysis of Japanese beech as treated by semi-flow hot-compressed water

Content Provider	Springer Nature Link
Author	Lu, Xin Yamauchi, Kazuchika Phaiboonsilpa, Natthan Saka, Shiro
Copyright Year	2009
Abstract	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 230°C/10 MPa for 15 min and the second at 270°C/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.
Starting Page	367
Ending Page	375
Page Count	9
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	55
Issue Number	5
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2009-08-04
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Japanese beech Hot-compressed water Hemicellulose Cellulose Lignin Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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