The amylases can be derived from several sources, such as plants, animals and micro-organisms. Because of their short growth period, the enzymes from microbial sources generally meet industrial demands [4,5].
The first enzyme produced industrially was an amylase from a fungal source in 1994, which was used for the treatment of digestive disorders [6].
At present, Bacillus, Aspergillus, Rhizopus and rhizobial isolates specified are considered to be the most important sources of industrial amylases [3, 7]. Nevertheless, various other sources of microbial amylases are been investigated in the world.