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Advanced control of dissolved oxygen concentration in fed batch cultures during recombinant protein production

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Abstract

Design and experimental validation of advanced pO2 controllers for fermentation processes operated in the fed-batch mode are described. In most situations, the presented controllers are able to keep the pO2 in fermentations for recombinant protein productions exactly on the desired value. The controllers are based on the gain-scheduling approach to parameter-adaptive proportional-integral controllers. In order to cope with the most often appearing distortions, the basic gain-scheduling feedback controller was complemented with a feedforward control component. This feedforward/feedback controller significantly improved pO2 control. By means of numerical simulations, the controller behavior was tested and its parameters were determined. Validation runs were performed with three Escherichia coli strains producing different recombinant proteins. It is finally shown that the new controller leads to significant improvements in the signal-to-noise ratio of other key process variables and, thus, to a higher process quality.

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Acknowledgments

This work was performed within the Excellence Cluster Biotechnology of the State of Sachsen-Anhalt, Germany. We gratefully thank the state’s government for the comprehensive support.

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Correspondence to A. Lübbert.

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Kuprijanov, A., Gnoth, S., Simutis, R. et al. Advanced control of dissolved oxygen concentration in fed batch cultures during recombinant protein production. Appl Microbiol Biotechnol 82, 221–229 (2009). https://doi.org/10.1007/s00253-008-1765-y

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Keywords

  • Fermentation
  • Dissolved oxygen
  • Adaptive pO2 control
  • Gain scheduling approach