Production of Keratinase by Free and Immobilized Cells of <Emphasis Type="Italic">Bacillus halodurans</Emphasis> Strain PPKS-2: Partial Characterization and Its Application in Feather Degradation and Dehairing of the Goat Skin |
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Authors: | Pathange Prakash Senigala K Jayalakshmi Kuruba Sreeramulu |
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Institution: | (1) Department of Biochemistry, Gulbarga University, Gulbarga, 585 106, Karnataka, India;(2) Agriculture Research Station, University of Agricultural Sciences, Gulbarga, 585 102, India; |
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Abstract: | An extremely alkaliphilic bacterial strain, Bacillus sp. PPKS-2, was isolated from rice mill effluents and screened for the production of extracellular keratinase. The maximum
production of keratinase occurred after 48 h in shaking culture at pH 11.0 and 37 °C in a medium containing 0.5% soybean flour.
The strain grew and produced alkaline keratinase using chicken feather and horn meal as the sole source of carbon and nitrogen.
An addition of 0.1% soybean flour or feather hydrolysate and sodium sulfite to feather medium increased the production and
complete solubilization of feather took place within 5 days under solid-state fermentation conditions. The partially purified
enzyme displayed maximum activity at pH 11.0 and 60 °C in a broad range of NaCl, 0–16%, and was not inhibited by sodium dodecyl
sulfate (10%), ethylenediaminetetraacetic acid (10 mM), H2O2 (15%), and other commercial detergents. Immobilization of the whole cells proved to be useful for continuous production of
keratinase and feather degradation. The enzyme was effectively used to remove hair from goat hide. The strain PPKS-2 can be
effectively used for solid waste management of poultry feather in submerged as well as solid-state fermentation. |
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