Abstract
In this study, the synthesis of xylonic acid from xylose by Gluconobacter oxydans NL71 has been investigated. According to the relationship between oxygen transfer rate and oxygen uptake rate, three different kinetic models of product formation were established and the nonlinear fitting was carried out. The results showed that G. oxydans has critical dissolved oxygen under different strain concentrations, and the relationship between respiration intensity and dissolved oxygen conformed to the Monod equation \(q_{{{\text{O}}_{2} }} = q_{{{\text{O}}_{2} ,\max }} \frac{{C_{{\text{L}}} }}{{K_{{{\text{O}}_{2} }} + C_{{\text{L}}} }}\). The maximum reaction rate per unit cell mass and the theoretical maximum specific productivity of G. oxydans obtained by the kinetic model are 0.042 mol/L/h and 6.97 g/gx/h, respectively. These results will assist in determining the best balance between the airflow rate and cell concentration in the reaction and improve the production efficiency of xylonic acid.
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The data that support the findings of this study are available from the corresponding author, Xu, upon reasonable request.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (No. 22208160), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 21KJB530015) and the National key research and development program (2021YFC2101602).
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XL: investigation, data curation, writing—original draft. CD: investigation, data curation, writing—original draft. TH: validation, investigation, data curation. YZ: formal analysis. LS: formal analysis. CX: conceptualization, methodology, software, writing—review and editing, visualization, supervision, project administration, funding acquisition. XG: resources, supervision, project administration.
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Liu, X., Ding, C., He, T. et al. Kinetic modeling of xylonic acid production by Gluconobacter oxydans: effects of hydrodynamic conditions. Bioprocess Biosyst Eng 46, 829–837 (2023). https://doi.org/10.1007/s00449-023-02865-6
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DOI: https://doi.org/10.1007/s00449-023-02865-6