Animal fleshing, the major proteinaceous solid waste
generated from leather industry, was used as substrate
for the production of alkaline protease by Bacillus
cereus 1173900 in solid-state fermentation (SSF).
Maximum protease activity of 12,310 U/g was observed
at 60 h in SSF crude extract. The extracted
protease enzyme was purified by 53.64-fold through
ammonium sulphate precipitation and chromatography
separation in Sephadex G-100. The purified protease
had a specific activity of 201.6 (U/mg). The molecular
weight of the purified enzyme was 66 kDa, determined
by SDS–PAGE. The zymogram also revealed a clear
hydrolytic zone due to proteolytic activity, which
coincided with the band obtained with SDS–PAGE.
Enzyme activity was inhibited by EDTA, suggesting
that the enzyme belongs to metalloprotease(s).
"Thirty to forty percent of the cost involved in the production of industrial enzymes depends on the cost of the growth medium   . Utilization of cheap material like agro-waste as an inducer in the liquid media is an alternative approach for protease production which reduces the expense  . "
"Similar findings have been reported with other Bacillus sp. (Ravindran et al. 2011). The reduction in enzyme yield after the optimum period was probably due to the depletion of nutrients available to the microorganisms. "
[Show abstract][Hide abstract] ABSTRACT: Cow dung, a cheap and easily available source of energy, was used as the substrate for the production of alkaline protease by solid-state fermentation using the Bacillus subtilis strain VV. In order to achieve the maximum yield of this enzyme, the following optimum process parameters are needed: fermentation period (72 h), pH (10.0), moisture content (140%), inoculum (25%), temperature (30-40°C), carbon source (2% (w/w) maltose) and nitrogen source (1% (w/w) urea). The protease was stable over a broad temperature range (30-50°C) and pH (8.0-10.0), with maximum activity at 50°C and pH 10.0. Among the divalent ions tested, Ca(2+) (0.01 M) increased enzyme activity. The purified protease, after being subjected to sodium dodecyl sulphate-polyacrylamide gel electrophoresis, was found to have a molecular mass of 38.5 kDa. The enzyme was solvent-and surfactant-stable and showed activity even after 24 h incubation along with various commercially available detergents. This enzyme possessed dehairing properties for animal hide after 16 h of incubation at room temperature. From these results it is evident that cow dung is a potential substrate for the production of a detergent-stable, dehairing protease by B. subtilis. This enzyme has a lot of potential applications in the detergent and leather-processing industries.
[Show abstract][Hide abstract] ABSTRACT: Alkaline protease, an enzyme used in the hydrolysis of protein was produced from Bacillus sp. From a total number of 80 Bacillus strains, 11 were promising based on their ability to produce clear zones on Nutrient agar plates fortified with 1-2% Casein. Three of the Bacilli spp; gave clear zones of 5.0 mm, 5.0 mm and 4.5 mm and were identified as Bacillus subtilis (A 2 1), B.polymxa (A 2 2) and B.licheniformis (B 3 8). Morphological studies revealed that all the Bacilli Isolates were gram positive, rods and identification was based on the use of Analytical Profile Index (API) Kits. The Bacillus Isolates had an enhanced growth in a range of 0.829-1.758 at 24h to 1.663-1.893 by 120h. Studies on the protein content of the enzyme produced by the Isolates were in a range of 53.75-70.63mg/ml at 0h to 85.00-197.50mg/ml by 120h. Enzyme activity for enzymes produced by the Bacillus Isolates was in a range of 2426.6-3031.2units/ml at 0h to 2506.6-3573.4units/ml by 120h. Studies on the optimal pH of activity by Bacillus Isolates were between a range of 2-11, with pH 10 being the optimum. Also, the temperature range for maximum activity of the enzyme produced by the Bacillus Isolates was 30 0 -50 0 C. The Significance of the alkaline protease produced in relation to their activity is discussed therein.
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