Abstract
S: - Among the six isolated amylase producing strains,Bacillus licheniformis(B1), the thermostable strain was selected from the soil of a paddy field. Its enzyme productivity and activity were evaluated. The activity of enzyme was calculated as 27.77 IU/ml. Effects of various carbon and organic nitrogen sources, and C/N ratio on enzyme production were examined. Maximum α - amylase production was obtained in medium containing 1% starch. Fructose supported the maximum amylase production among all the sugar studied. Of the organic nitrogen sources tested, peptone was found to be the best organic nitrogen source for excess yield of the enzyme. The optimum C/N ratio was found to be 1:1. The α amylase exhibited activity at a wide pH and temperature range and activity were found to be optimal at pH 6 and 40 °C respectively. The molecular weight of α amylase was calculated by sodium dodecyl sulphate gel electrophoresis and found to be around 29,000 Daltons.
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