Abstract
The optimal conditions for production of carboxymethylcellulase (CMCase) of Bacillus amyloliquefaciens DL-3 by a recombinant Escherichia coli JM109/DL-3 were established at a flask scale using the response surface method (RSM). The optimal conditions of rice bran, tryptone, and initial pH of the medium for cell growth extracted by Design Expert Software were 66.1 g/L, 6.2 g/L, and 7.2, respectively, whereas those for production of CMCase were 58.0 g/L, 5.0 g/L, and 7.1. The analysis of variance (ANOVA) of results from central composite design (CCD) indicated that significant factor (“probe > F” less than 0.0500) for cell growth was rice bran, whereas those for production of CMCase were rice bran and initial pH of the medium. The optimal temperatures for cell growth and the production of CMCase by E. coli JM109/DL-3 were found to be 37°C. The optimal agitation speed and aeration rate of 7 L bioreactors for cell growth were 498 rpm and 1.4 vvm, whereas those for production of CMCase were 395 rpm and 1.1 vvm. The ANOVA of results indicated that the aeration rate was more significant factor (“probe > F” less than 0.0001) than the agitation speed for cell growth and production of CMCase. The optimal inner pressure for cell growth was 0.08 MPa, whereas that for the production of CMCase was 0.06 MPa. The maximal production of CMCase by E. coli JM109/DL-3 under optimized conditions was 871.0 U/mL, which was 3.0 times higher than the initial production of CMCase before optimization.
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Lee, YJ., Kim, HJ., Gao, W. et al. Statistical optimization for production of carboxymethylcellulase of Bacillus amyloliquefaciens DL-3 by a recombinant Escherichia coli JM109/DL-3 from rice bran using response surface method. Biotechnol Bioproc E 17, 227–235 (2012). https://doi.org/10.1007/s12257-011-0258-5
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DOI: https://doi.org/10.1007/s12257-011-0258-5