Abstract
We have developed a flow-through device which uses high frequency, low energy ultrasonic resonance fields to transiently aggregate hybridoma cells and return them by sedimentation to a perfusion bioreactor. The system retained up to 99 percent of the inflowing viable cells with no measurable effect on viability. Viable cells were selectively retained at up to 3 percent higher efficiency than nonviable cells. A stirred tank bioreactor was operated for 700 hours with acoustic cell recycle. Concentrations greater than 5 x 10(7) cells/ml were attained with a 5-fold increase in antibody concentration and a 70-fold increase in volumetric productivity compared with batch culture.
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