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- W2040375492 abstract "An investigation was carried out on the production of alpha-amylase by Bacillus thermooleovorans NP54, its partial purification and characterization.The thermophilic bacterium was grown in shake flasks and a laboratory fermenter containing 2% soluble starch, 0.3% tryptone, 0.3% yeast extract and 0.1% K2HPO4 at 70 degrees C and pH 7.0, agitated at 200 rev min(-1) with 6-h-old inoculum (2% v/v) for 12 h. When the enzyme was partially purified using acetone (80%[v/v] saturation), a 43.7% recovery of enzyme with 6.2-fold purification was recorded. The KM and Vmax (soluble starch) values were 0.83 mg ml(-1) and 250 micromol mg(-1) protein min(-1), respectively. The enzyme was optimally active at 100 degrees C and pH 8.0 with a half-life of 3 h at 100 degrees C. Both alpha-amylase activity and production were Ca2+ independent.Bacillus thermooleovorans NP54 produced calcium-independent and thermostable alpha-amylase.The calcium-independent and thermostable alpha-amylase of B. thermooleovorans NP54 will be extremely useful in starch saccharification since the alpha-amylases used in the starch industry are calcium dependent. The use of this enzyme in starch hydrolysis eliminates the use of calcium in starch liquefaction and subsequent removal by ion exchange." @default.
- W2040375492 created "2016-06-24" @default.
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- W2040375492 date "2000-11-01" @default.
- W2040375492 modified "2023-10-17" @default.
- W2040375492 title "Production and partial characterization of thermostable and calcium-independent alpha-amylase of an extreme thermophile Bacillus thermooleovorans NP54" @default.
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- W2040375492 doi "https://doi.org/10.1046/j.1472-765x.2000.00830.x" @default.
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