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http://dx.doi.org/10.4014/mbl.1606.06009

Statistical Optimization of Culture Conditions for Enhanced Production of Trehalose by Recombinant Escherichia coli Using Crude Glycerol  

So, Hong (Department of Chemical Engineering and ERI, Gyeongsang National University)
Kim, Sung Bae (Department of Chemical Engineering and ERI, Gyeongsang National University)
Kim, Chang-Joon (Department of Chemical Engineering and ERI, Gyeongsang National University)
Publication Information
Microbiology and Biotechnology Letters / v.44, no.4, 2016 , pp. 497-503 More about this Journal
Abstract
This study aimed to optimize the culture conditions of recombinant Escherichia coli expressing otsBA using crude glycerol for the enhanced production of trehalose. The effects of culture temperature and isopropyl ${\beta}$-D-1-thiogalactopyranoside (IPTG)-induction were investigated. Trehalose production and cell growth were highest when cells were cultured at $37^{\circ}C$ and induced with IPTG. The concentrations of IPTG, validamycin A, and NaCl were optimized using Box-Behnken design. Statistical analyses of the experimental data revealed that the concentrations of IPTG and NaCl had significant effects on trehalose production, but that of validamycin A did not. Contour plot analysis and model calculation showed that the highest amount of trehalose could be produced at 298 mM NaCl and 0.1 mM IPTG. Under these optimal conditions, the optical density at 600 nm and trehalose production were $5.4{\pm}0.2$ and $304{\pm}15mg/l$, respectively.
Keywords
Crude glycerol; recombinant Escherichia coli; otsBA; trehalose;
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