cellulase is a family of at least 3 groups of
enzymes [10, 13–15], endo-(1,4)-β-D-glucanase (EC 3.2.1.4)
exo-(1,4)-β-D-glucanase (EC 3.2.1.91), and β-glucosidases
(EC 3.2.1.21). The exoglucanase (CBH) acts on the ends
of the cellulose chain and releases β-cellobiose as the
end product; endoglucanase (EG) randomly attacks the
internal O-glycosidic bonds, resulting in glucan chains of
different lengths; and the β-glycosidases act specifically on
the β-cellobiose disaccharides and produce glucose