Abstract
Although several scaling bioreactor models of mammalian cell cultures are suggested and described in the literature, they mostly lack a significant validation at pilot or manufacturing scale. The aim of this study is to validate an oscillating hydrodynamic stress loop system developed earlier by our group for the evaluation of the maximum operating range for stirring, based on a maximum tolerable hydrodynamic stress. A 300-L pilot-scale bioreactor for cultivation of a Sp2/0 cell line was used for this purpose. Prior to cultivations, a stress-sensitive particulate system was applied to determine the stress values generated by stirring and sparging. Pilot-scale data, collected from 7- to 28-Pa maximum stress conditions, were compared with data from classical 3-L cultivations and cultivations from the oscillating stress loop system. Results for the growth behavior, analyzed metabolites, productivity, and product quality showed a dependency on the different environmental stress conditions but not on reactor size. Pilot-scale conditions were very similar to those generated in the oscillating stress loop model confirming its predictive capability, including conditions at the edge of failure.





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Acknowledgments
The authors would like to acknowledge SNF (200020_147137/1) for financial support of this project. Furthermore, Miroslav Soos was partially supported by the Specific University Research grant of UCT (grant number 20/2015).
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This study was funded by SNF (grant number 200020_147137/1).
This study was partially funded by the Research grant of UCT (grant number 20/2015).
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Benjamin Neunstoecklin declares that he has no conflict of interest.
Thomas K. Villiger declares that he has no conflict of interest.
Eric Lucas declares that he has no conflict of interest.
Matthieu Stettler declares that he has no conflict of interest.
Hervé Broly declares that he has no conflict of interest.
Massimo Morbidelli declares that he has no conflict of interest.
Miroslav Soos declares that he has no conflict of interest.
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Neunstoecklin, B., Villiger, T.K., Lucas, E. et al. Pilot-scale verification of maximum tolerable hydrodynamic stress for mammalian cell culture. Appl Microbiol Biotechnol 100, 3489–3498 (2016). https://doi.org/10.1007/s00253-015-7193-x
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DOI: https://doi.org/10.1007/s00253-015-7193-x
