Medium Optimization for Phytase Production by Recombinant Escherichia coli Using Statistical Experimental Design

  • Choi, Won-Chan (Microbial Genomics Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Oh, Byng-Chul (Microbial Genomics Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Hyung-Kwoun (Microbial Genomics Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Eun-Sook (Department of Preparatory Oriental Medicine, Kyungsan University)
  • 발행 : 2002.06.01

초록

The production of E. coli WC7 phytase from a recombinant E. coli strain was optimized using a statistical experimental design approach. Two-level complete factorial designs with seven variables were used for the media optimization. In the first optimization step, the influence of disodium succinate, yeast extract, $K_2HPO_4,\;NH_4H_2PO_4,\;MgSO_4$, NaCl, and trace elements on phytase production was evaluated. As a result, disodium succinate, yeast extract, $NH_4H_2PO_4$, NaCl, and the trace elements were found to have a positive influence on the phytase production, while $K_2HPO_4\;and\;MgSO_4$ had a negative influence. In the second step, the concentrations of disodium succinate and yeast extract were further optimized using central composite designs. The maximum phytase activity obtained was 234 U/ml using 15.9 g/1 disodium succinate, 20 g/1 yeast extract, 5 g/1 K_2HPO_4,\;10 g/1 NH_4H_2PO_4,\;1.5 g/1 MgSO_4$, 4 g/1 NaCl, and 1.5 m1/1 trace elements, which was about a 14-fold increase in comparison with that obtained using the basal medium.

키워드

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