American Journal of Microbiological Research
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American Journal of Microbiological Research. 2015, 3(5), 165-170
DOI: 10.12691/ajmr-3-5-3
Open AccessArticle

Optimization of Culture Conditions to Enhance Nattokinase Production Using RSM

Kawther Isam Eldeen1, Hanan Moawia Ibrahim1, , Elrashied Elimam Elkhidir2 and Hassan Beshir Elamin3

1Central Lab. Ministry of Higher Education and Scientific Research, Sudan

2Faculty of Agriculture, University of Khartoum, Ministry of Higher Education and Scientific Research, Sudan

3Commission of Biotechnology and Genetic Engineering, National Centre for Research, Sudan

Pub. Date: September 28, 2015

Cite this paper:
Kawther Isam Eldeen, Hanan Moawia Ibrahim, Elrashied Elimam Elkhidir and Hassan Beshir Elamin. Optimization of Culture Conditions to Enhance Nattokinase Production Using RSM. American Journal of Microbiological Research. 2015; 3(5):165-170. doi: 10.12691/ajmr-3-5-3


This study was conducted with the aim to isolate, characterize and optimize of Bacillus subtilis that produce nattokinase with highest activity under optimal culture conditions. The study was carried out on 25 samples collected from different regions in Khartoum. Primary screening and characterization of the microorganism showed that seven out of 25 samples (28%) were presumptively considered Bacillus subtilis according to microscopic and biochemical analysis. The promising isolates produced an extracellular crude nattokinase indicating by heamolytic and fibrinolytic activity. Selective medium was prepared for the extraction and production of nattokinase from these new isolates. Optimization of enzymatic production using statistical experimental design was carried out using central composite design (CCD) in response to surface methodology (RSM) to achieve the maximum nattokinase yield such as temperature and pH in shake flask culture from Bacillus spp. The optimal conditions for maximum enzyme production were found to be of 45°C and pH of 5.0. This study reveals that under optimized conditions, nattokinase yield was significantly increased which was higher than earlier reports and promises the use of RSM as an efficient tool for nattokinase production

optimization nattokinase RSM fibrinolytic activity

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