Abstract
Optimization of process parameters for phytase production by Enterobacter sp. ACSS led to a 4.6-fold improvement in submerged fermentation, which was enhanced further in fed-batch fermentation. The purified 62 kDa monomeric phytase was optimally active at pH 2.5 and 60 °C and retained activity over a wide range of temperature (40–80 °C) and pH (2.0–6.0) with a half-life of 11.3 min at 80 °C. The kinetic parameters K m, V max, K cat, and K cat/K m of the pure phytase were 0.21 mM, 131.58 nmol mg−1 s−1, 1.64 × 103 s−1, and 7.81 × 106 M−1 s−1, respectively. The enzyme was fairly stable in the presence of pepsin under physiological conditions. It was stimulated by Ca+2, Mg+2 and Mn+2, but inhibited by Zn+2, Cu+2, Fe+2, Pb+2, Ba+2 and surfactants. The enzyme can be applied in dephytinizing animal feeds, and the baking industry.
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The financial support from the National Research Foundation, Republic of South Africa and Durban University of Technology is gratefully acknowledged.
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Chanderman, A., Puri, A.K., Permaul, K. et al. Production, characteristics and applications of phytase from a rhizosphere isolated Enterobacter sp. ACSS. Bioprocess Biosyst Eng 39, 1577–1587 (2016). https://doi.org/10.1007/s00449-016-1632-7
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DOI: https://doi.org/10.1007/s00449-016-1632-7