isolation of alpha-amylase producing thermophilic bacillus strains and partial characterization of the enzymes
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2015
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Abstract
In the present study, we isolated three thermophilic Bacillus strains from the soil samples collected from the coast sediments of the Burnaz Stream located in Erzin. The isolates were entitled as Bacillus sp. CT1, CT2, and CT3, respectively. The maximum α-amylase production was revealed at 60°C for CT1 strain, and at 80°C for CT2 and CT3 strains, respectively. The optimum enzyme activity was observed at 90°C for CT1 α-amylase, whereas at 60°C for CT2 and CT3 α-amylases. On the other hand, optimum pH value for CT2 α-amylase was 7.0, whereas 8.0 for CT1 and CT3 α-amylases. The specific activities of CT1, CT2, and CT3 amylases were 317.6, 113.3 and 362.7 U/mg at 55°C, respectively. The estimated molecular weight of CT1 and CT3 α-amylase was 65 kDa, and for CT2 α-amylase was 38 kDa by zymogram analysis.
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| Authors | ;Celal Türker;Bahri Devrim Özcan |
| Journal | annals of agricultural sciences |
| Year | 2015 |
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