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Improve Production of Pullulanase of Bacillus subtilis in Batch and Fed-Batch Cultures

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Abstract

Pullulanase is a debranching enzyme that cleaves explicitly α-1,6 glycosidic bonds, which is widely used in starch saccharification, production of glucose, maltose, and bioethanol. The thermal-resistant pullulanase is isolated from a variety of microorganisms; however, the lack of industrial production of pullulanase has hindered the transformation of the laboratory to industry. In this study, the expensive maltose syrup and soybean meal powder were replaced with cheap corn starch and corn steep liquor, exhibiting 440 U/mL of pullulanase in shake flasks by changing the C/N value and the total energy of the medium. Subsequently, the cultivation conditions were explored in a 50-L and 50-m3 bioreactor. In batch culture, the pullulanase activity reached 896 U/mL, while it increased to 1743 U/mL in fed-batch culture by controlling the dissolved oxygen, pH, reducing sugar content, and temperature. Remarkably, the cultivation volume was enlarged to 50 m3 based on the technical parameters of fed-batch culture. The industrial production of pullulanase was successful, and the activity achieved 1546 U/mL. When the product was stored at room temperature (25 °C) for 6 months, the pullulanase activity was over 90%. The half-lives at 60 and 80 °C were 119.45 h and 51.18 h, respectively, which satisfied the industrial application requirements of pullulanase.

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Funding

The authors acknowledge the financial support provided by the National Natural Science Foundation of China (31771948)

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Authors and Affiliations

  1. College of Food Science and Technology, Nanjing Agriculture University, 1 Weigang, Nanjing, 210095, China

    Fanqiang Meng, Xiaoyu Zhu, Haizhen Zhao, Fengxia Lu & Zhaoxin Lu

  2. College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 21003, China

    Yingjian Lu

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  1. Fanqiang Meng
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  2. Xiaoyu Zhu
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  3. Haizhen Zhao
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  4. Fengxia Lu
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Correspondence to Zhaoxin Lu.

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Meng, F., Zhu, X., Zhao, H. et al. Improve Production of Pullulanase of Bacillus subtilis in Batch and Fed-Batch Cultures. Appl Biochem Biotechnol 193, 296–306 (2021). https://doi.org/10.1007/s12010-020-03419-2

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  • DOI: https://doi.org/10.1007/s12010-020-03419-2

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