Abstract
Abstract We have developed a new probe that measures the oxygen uptake rate (OUR) of mammalian cells, an important indicator for the metabolic state, inside the reactor (in-situ) and in real-time without the need for sampling or complicated analytics. The probe isolates a known volume of cell culture from the bulk inside the bioreactor, monitors the oxygen consumption over time and releases it again. The sample is mixed during the measurement with a new agitation system to keep the cells in suspension and prevent oxygen concentration gradients. The OUR measurement system also doubles as a standard DO probe for process monitoring when it is not performing OUR measurements. This new probe was successfully tested in BHK perfusion cell cultures.
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