Abstract
A novel β-mannanase-producing strain, Bacillus subtilis TJ-102, was identified and characterized. Response surface method was applied to improving and enhancing the enzyme production. The optimized media components were obtained: 45.25 g/L konjac, 9.29 g/L Na2HPO4·12H2O, 2.60 g/L CaCO3, 1.0 g/L (NH4)2SO4, 0.3 g/L KH2PO4, 1.0 g/L NaCl, 1.0 g/L MgCl2·6H2O, and 0.01 g/L FeSO4. Under these conditions, the β-mannanase activity could achieve 205.3 U/mL in a 7-L fermentor. Then, β-mannanase was 7.39-fold purified by salting out, ultrafiltration, anion-exchange, and size-exclusion preparative chromatography with a recovery of 21.41 % and a specificity of 125.36 U/mg proteins. β-Mannanase was stable below 65 °C and pH 5.0–8.0, which exhibited excellently enzymatic efficiency in the preparation of gluco-mannooligosaccharides (GMOS) by hydrolyzing konjac flour. The GMOS yield of 57.76 % has been achieved with 8.71 % of mannose and 14.49 % of glucose, demonstrating the potential use of β-mannanase in food industry.
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This work was supported by the Program for New Century Excellent Talents in Chinese University (NCET-08-0386), the 863 Program of China (2008AA10Z318), the Natural Science Foundation of China (20976125; 31071509) and Tianjin (10JCYBJC05100), and the Program of Introducing Talents of Discipline to Universities of China (No. B06006).
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Mengfan Wang and Shengping You have contributed equally to this work.
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Wang, M., You, S., Zhang, S. et al. Purification, characterization, and production of β-mannanase from Bacillus subtilis TJ-102 and its application in gluco-mannooligosaccharides preparation. Eur Food Res Technol 237, 399–408 (2013). https://doi.org/10.1007/s00217-013-2002-1
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DOI: https://doi.org/10.1007/s00217-013-2002-1