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The thermodynamic and kinetic properties of solids state raw starch digesting alpha amylase from newly isolated  Bacillus licheniformis  RT7PE1 strain were studied. The kinetic values  Q    p  ,  Y    p / s  ,  Y    p / X  , and  q    p   were proved to be best with 15% wheat bran. The molecular weight of purified enzyme was 112 kDa. The apparent  K    m   and  V   max  values for starch were 3.4 mg mL −1  and 19.5 IU mg −1  protein, respectively. The optimum temperature and pH for   α  -amylase were 55°C, 9.8. The half-life of enzyme at 95°C was 17h. The activation and denaturation activation energies were 45.2 and 41.2 kJ mol −1 , respectively. Both enthalpies (Δ H   ∗ ) and entropies of activation (Δ S   ∗ ) for denaturation of   α  -amylase were lower than those reported for other thermostable   α  -amylases.

Solid State Fermentation of a Raw Starch Digesting Alkaline Alpha-Amylase from Bacillus licheniformis RT7PE1 and Its Characteristics