|EC Number|| EC 188.8.131.52 （Xylanase）
EC 184.108.40.206 （Galactanase）
Hemicellulase is a collective term for enzymes that hydrolyze hemicellulose. Hemicellulose is a common name for polysaccharides that can be obtained by alkaline extraction of the plant tissues. Some of the main polysaccharides that constitute hemicellulose are xylan, arabinoxylan, xyloglucan and glucomannan. Enzymes that hydrolyze these polysaccharides are called hemicellulases. Xylanase and galactanase are representative enzymes that belong to the hemicellulase group.
Hemicellulase is used to clarify the juice of mandarin oranges. Although pectinase is used to clarify the juices of apples and grapes, the juice of mandarin oranges are clarified by the simultaneous use of pectinase and hemicellulase. In food processing, it is rare that the desired result can be obtained with the use of hemicellulase alone. Hemicellulases work in conjunction with cellulases and pectinases.
Hemicellulase is also used in breadmaking. By allowing hemicellulase to break down arabinoxylan and other polysaccharides in flour, the basic ingredient in breadmaking, the rise of the bread can be improved.
Hemicellulases are found in microorganisms and mushrooms, such as Aspergillus niger, Trichoderma reesei, Cephalosporium sacchari and Agaricus bisporus.