Cellulose

(→4)-β-D-glucose(1→). There are two types of cellulose:

Cellulose I, a microcrystalline cellulose, and
Cellulose II, mercerized cellulose [1,15].

Two additional types are known, but they are derived from heat or alkali tratment of type I and II [15].

Highly ordered fibers that form a crystalline structure. The crystalline regions vary in size and represent areas of great mechanical strenght and high resistance to attack by chemical reagents and hydrolytic enzymes [3].