Abstract
The optimum values of the critical variables determined by the central composite design of response surface methodology (RSM) for maximum phytase production (1881.26 U g−1 dry mouldy residue (DMR)) by Sporotrichum thermophile are 2.5 % Tween 80, 1.0 % yeast extract and 48 h of incubation period. Phytase production in the mixed substrate (sugarcane bagasse and wheat bran) fermentation enhanced 11.6-fold over the initial production as a consequence of optimization. Phytase titres are sustainable in flasks, trays and column bioreactor (1796 to 2095 U g−1 DMR), thus validating the model and the process for large-scale phytase production. When the yeast extract was replaced with corn steep liquor (2 % w/v), a sustained enzyme titre (1890 U g−1 DMR) was attained, making the process cost-effective. Among all the detergents, Tween 80 supported a higher phytase production than others. The enzyme efficiently liberated nutritional components from poultry feed (inorganic phosphate, soluble protein and reducing sugars) in a time-dependent manner.
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The authors acknowledge the financial assistance (BT/PR4771/PID/6/636/2012) from the Department of Biotechnology (DBT), Govt. of India, New Delhi, during the course of this investigation.
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Kumari, A., Satyanarayana, T. & Singh, B. Mixed Substrate Fermentation for Enhanced Phytase Production by Thermophilic Mould Sporotrichum thermophile and Its Application in Beneficiation of Poultry Feed. Appl Biochem Biotechnol 178, 197–210 (2016). https://doi.org/10.1007/s12010-015-1868-8
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DOI: https://doi.org/10.1007/s12010-015-1868-8