Abstract
Oxygen supply is crucial in industrial application of microbial systems, such as Corynebacterium glutamicum, but oxygen transfer is often neglected in early strain characterizations, typically done under aerobic conditions. In this work, a new procedure for oxygen transfer screening is presented, assessing the impact of maximum oxygen transfer conditions (OTRmax) within microtiter plate-based cultivation for enhanced throughput. Oxygen-dependent growth and productivity were characterized for C. glutamicum ATCC13032 and C. glutamicum DM1933 (lysine producer). Biomass and lysine product yield are affected at OTRmax below 14 mmol L−1 h−1 in a standardized batch process, but not by further increase of OTRmax above this threshold value indicating a reasonable tradeoff between power input and oxygen transfer capacity OTRmax. The described oxygen transfer screening allows comparative determination of metabolic robustness against oxygen transfer limitation and serves identification of potential problems or opportunities later created during scale-up.





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Acknowledgments
The authors thank the Bundesministerium für Bildung und Forschung (BMBF) for funding in the cluster project “Corynebacterium: Improving flexibility and fitness for industrial production” (Grant No. 0315589A). We also thank Dr. Frank Kensy, m2p-Labs (Baesweiler, Germany) for various support and background information on BioLector mass transfer properties as well as Evonik Industries AG for valuable cooperation within the project.
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449_2014_1234_MOESM1_ESM.tif
Supplementary Figure 6: Schematic principle of oxygen transfer screening in microtiter plates: at fixed cultivation conditions in shaken bioreactors, the maximum oxygen transfer capacity (OTRmax) is a function of gas-phase oxygen content and filling volume. By varying both parameters, a broad range of oxygen transfer conditions can be assessed within a small number of cultivations. (TIFF 218 kb)
449_2014_1234_MOESM2_ESM.tif
Supplementary Figure 7: Online biomass determination in BioLector microplate cultivation is based on backscatter of light excitation, which is linearly dependent on biomass concentration at constant filling volume of the cultivation well (top). The correlation is more complex for changing filling volume at constant biomass (bottom), where secondary effects (e.g. surface reflection, changes in geometric properties) can have an influence on backscatter signal. (TIFF 412 kb)
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Käß, F., Prasad, A., Tillack, J. et al. Rapid assessment of oxygen transfer impact for Corynebacterium glutamicum . Bioprocess Biosyst Eng 37, 2567–2577 (2014). https://doi.org/10.1007/s00449-014-1234-1
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DOI: https://doi.org/10.1007/s00449-014-1234-1


