Abstract
Dextran causes negative impact on the normal production of sugar industry. Traditional removal methods have many disadvantages. 6-alpha-d-glucan-6-glucanohydrolase (EC 3.2.1.11) from Chaetomium gracile without food safety concern could remove dextran, but it has low level of enzyme production. The present study aimed to improve α-dextranase activity to meet industry demand. Consequently, α-dextranase activity reached 242.8 U/mL when fermentation condition was 29 °C, pH 6.0 and 220 rpm. Meanwhile, ten glass beads were added to fermentation medium when fermentation time was 12 h, which improved enzyme activity by 135.5% with the highest activity. Purified α-dextranase exhibited excellent thermal stability and surfactants tolerance. α-Dextranase from C. gracile could remove dextran by 46.6% in mixed sugarcane juice and 14.1% in clarified sugarcane juice. It had similar dextran removal efficiency with commercial enzymes. These evaluations showed that α-dextranase had great potential in removing dextran in sugar industry.
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This work was supported by the National Natural Science Foundation of China (31460026, 31560027) and Guangxi Science and Technology Development Program (Grant No. 14122003-6).
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Zhang, Z., Liu, J., Ma, S. et al. Enhancement of Catalytic Performance of α-dextranase from Chaetomium gracile Through Optimization and Suitable Shear Force. Sugar Tech 20, 78–87 (2018). https://doi.org/10.1007/s12355-017-0540-8
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DOI: https://doi.org/10.1007/s12355-017-0540-8