Hemicellulases

A review of bioactive plant polysaccharides: Biological activities, functionalization, and biomedical applications

“…For example, O-acetyl-4-O-methylglucuronoxylans with (1-2) linked 4-O-methyl-α-D-glucuronic acid side groups and O-acetyl group at C 2 or C 3 are the major hemicelluloses in hardwoods and account for 15-30% of the dry wood. Xylans in softwood account only for 5-10% of the dry wood, and mainly exist as arabino-4-O-methylglucuronoxylans, which have 1-3) linked α-L-arabinofuranose and (1-2) linked 4-O-methyl-α-Dglucuronic acid side groups(Teleman, Tenkanen, Jacobs, & Dahlman, 2002;Viikari, Poutanen, Tenkanen, & Tolan, 2002).…”

Bioethanol from Lignocellulosic Biomass

“…For example, hydrolysis of hemicellulose xylan requires endoxylanse, b-xylosidase, and accessory enzymes such as acetyl xylan esterase to remove acetyl substituent from the xylan backbone, a-arabinofuransoidases to remove arabinose [106]. Hydrolysis of hemicellulose (galacto) glucomannan requires synergistic action of b-mannanase, b-mannosidase and b-glucosidase, and a-galactosidase to hydrolyze mannan backbone to oligomers and oligomers to monomers and to remove galactose side chain, respectively [8,105,107].…”