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In relation to this article, we declare that there is no conflict of interest.
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Received January 16, 2009
Accepted March 17, 2009
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Optimization of medium for phenylalanine ammonia lyase production in Escherichia coli using response surface methodology

Hebei Fermentation Engineering Research Center, College of Bioscience and Bioengineering, Hebei University of Science and Technology, 70 Yuhua East Road, Shijiazhang 050018, China
cjd007cn@163.com
Korean Journal of Chemical Engineering, January 2010, 27(1), 174-178(5), 10.1007/s11814-009-0234-3
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Abstract

A culture medium for phenylalanine ammonia lyase (PAL) production in E. coli was developed following preliminary studies by means of response surface methodology (RSM). The medium components having significant effect on the production were first identified using a fractional factorial design. Then, central composite design (CCD) was utilized to optimize the medium constituents and explain the combined effects of four medium constiuents, viz., glucose, yeast extract, (NH4)2HPO4 and MgSO4. A quadratic model was found to fit the PAL production. CCD revealed that the optimum values of the test variables for PAL production were glucose 28.2 g/L, yeast extract 5.01 g/L, (NH4)2HPO4 7.02 g/L and MgSO4 1.5 g/L. PAL production of 62.85 U/g, which was in agreement with the prediction, was observed in verification experiment. In comparision to the production of basal medium, 1.8-fold increase was obtained.

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