Origins:
- Transient bacillus bacillus: B. subtilis, B. licheniformis and B. amyloliquefaciens.
- Mold fungi of the genus Aspergillus: A. oryzae, A.niger, A.chevalieri.
Effect:
- Catalysis of α-1,4-glycosidic bond cleavage in the inner chain of amylose or amylopectin.
- The final products of action are different lengths of branched oligosaccharides: maltose and glucose, which provide nutrients for yeast.