Abstract
Fish scale, the chief waste material of fish processing industries was processed and tested for production of extracellular protease by mutant Aspergillus niger AB100. Protease production by A. niger AB100 was greatly enhanced in presence of processed fish scale powder. Where as among the three complex nutrients tested, soya bean meal shows maximum stimulatory effect over protease production (2,776 μmol/ml/min) when used in combination with glucose (5% w/v) and urea (2.5% w/v). The protease was optimally active at pH 7.0, retaining more than 60% of its activity in the pH range of 5–9. The enzyme was found to be most active at 50°C and stable at 30°C for 1 h. Purification of enzyme by CM-Cellulose and SDS-PAGE resulted in about 26-fold increase in the specific activity of the enzyme with a molecular weight of 30.9 kDa. HPLC study shows the purity of the enzyme as 75.92%. By the activating effect of divalent cations (Fe2+, Zn2+, Mn2+, Ca2+and Mg2+) and inhibiting effect of chelating agent (EDTA) and Hg2+, the enzyme was found to be a metalloprotease.
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The authors thank the Department of Food Processing and Horticulture, Government of West Bengal and Department of Chemical Engineering, University of Calcutta for providing funds and laboratory facilities, respectively, for the present study.
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Basu, B.R., Banik, A.K. & Das, M. Production and characterization of extracellular protease of mutant Aspergillus niger AB100 grown on fish scale. World J Microbiol Biotechnol 24, 449–455 (2008). https://doi.org/10.1007/s11274-007-9492-6
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DOI: https://doi.org/10.1007/s11274-007-9492-6