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Coproduction of menaquinone-7 and nattokinase by Bacillus subtilis using soybean curd residue as a renewable substrate combined with a dissolved oxygen control strategy
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Numerous physiological functions of menaquinone-7 (MK-7) act to reduce vascular calcification, suggesting that MK-7 may be a potential therapy for Alzheimer’s and Parkinson’s disease, and in this study, we attempted to increase the concentration of MK-7 synthesized by Bacillus subtilis natto, a standard nattokinase (NK) producing strain. Different Bacillus subtilis isolates demonstrated positive correlations between MK-7 and NK concentrations. Response surface methodology (RSM) was employed to optimize a culture medium for the simultaneous production of these molecules; the optimized medium contained the following components (%, w/v): soybean curd residue, 12.2; soya peptone, 5.7; lactose, 2.6; and K2HPO4, 0.6. The fermentation process was subsequently optimized based on online feedback control of fermentation process parameters. The dissolved oxygen (DO) concentration played an important role in the production of MK-7 and NK. With increased DO concentrations, the cell growth rate and NK activity increased. In contrast, at low DO concentrations, the concentration of MK-7 rapidly increased during the late fermentation stage. Thus, in this study, the production of MK-7 and NK by Bacillus subtilis was accomplished using soybean curd residue through medium optimization and DO control. This novel coproduction strategy was developed by controlling the aeration rate during the fermentation process. The concentrations of MK-7 and NK achieved in this study reached 91.25 mg/L and 2675.73 U/mL, respectively.
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“Wang et al. [44] included soy bean curd as well as soya peptone at concentrations of 12.2% w/v and 5.7% w/v respectively, in the medium for metabolite production and growth of B. subtilis .”
From Optimization of Bacillus subtilis PW12 biomass production using RSM: a preliminary study towards single-cell protein production for aquaculture (2024) · cites this paper as [44]
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“Substrates based on soya protein, such as defatted soy flour and soy bean curd, have been used in experiments to produce biomass and metabolites by fermentation with B. subtilis [44,45].”
From Optimization of Bacillus subtilis PW12 biomass production using RSM: a preliminary study towards single-cell protein production for aquaculture (2024) · cites this paper as [44]
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Gracious, M., & Nandakumar, S. (2024) · Journal of Applied Biology & Biotechnology · doi:10.7324/jabb.2024.177031 · Cited by 2
“Substrates based on soya protein, such as defatted soy flour and soy bean curd, have been used in experiments to produce biomass and metabolites by fermentation with B. subtilis [44,45].”
Influential
Metadata
- Authors
- Wang, H., Sun, X., Wang, L., Wu, H., Zhao, G., Liu, H., Wang, P., & Zheng, Z.
- Affiliations
- University of Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- Corresponding author
- Wang, Peng
- Zheng, Zhiming
- Venue
- Annals of Microbiology
- Published
- 2018-09-14
- Volume
- 68
- Issue
- 10
- Pages
- 655-665
- ISSN
- 0003-4649 (ISSN-L)
- 1590-4261
- 1869-2044
- OpenAlex
- W2891514938
- Cited by
- 30
- References
- 0
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 3 · 2020: 6 · 2019: 5
- FWCI
- 1.25
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Annals of Microbiology (publishedVersion)
- Funders
- The National High Technology Research and Development Program of China (2014AA021704)
- Major Projects of Science and Technology in Anhui Province (17030801036)
- Topics
- Life Sciences › Immunology and Microbiology › Applied Microbiology and Biotechnology › Biopolymer Synthesis and Applications
- Health Sciences › Nursing › Nutrition and Dietetics › Vitamin K Research Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
- Keywords
- menaquinone-7, nattokinase, Bacillus natto, soybean curd residue, co-production, dissolved oxygen control, fermentation optimization, culture medium optimization, air flow rate, renewable substrates, vascular calcification, Alzheimer's disease, Parkinson's disease
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- Wang, H., Sun, X., Wang, L., Wu, H., Zhao, G., Liu, H., Wang, P., & Zheng, Z. (2018). Coproduction of menaquinone-7 and nattokinase by Bacillus subtilis using soybean curd residue as a renewable substrate combined with a dissolved oxygen control strategy. Annals of Microbiology. https://doi.org/10.1007/s13213-018-1372-9