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Bioresour Technol. 2008 Sep;99(14):6386-90. doi: 10.1016/j.biortech.2007.11.065. Epub 2008 Jan 3.

Production of phytase by a marine yeast Kodamaea ohmeri BG3 in an oats medium: optimization by response surface methodology.

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  • 1UNESCO Chinese Center of Marine Biotechnology, Ocean University of China, Yushan Road, No. 5, Qingdao, China.


Statistical experimental designs were applied for the optimization of phytase production by a marine yeast Kodamaea ohmeri BG3 in a cost-effective oats medium. Using Plackett-Burman design, oats, ammonium sulfate and initial pH were identified as significant factors and these factors were subsequently optimized using a central composite design (CCD). The optimum variables that supported maximum enzyme activity were oats 1.0%, ammonium sulfate 2.3%, glucose 2.0%, NaCl 2.0% and initial pH 6.3. The validity of the optimized variables was verified in shake-flasks level. An overall 9-fold enhancement in phytase activity (62.0-->575.5 U/ml) was attained due to the optimization.

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