Hybrid modeling for optimizing cell cultivation in mAb production using a small‐scale automated experimental platform

Abstract This work presents the optimization of cell cultivation for monoclonal antibody (mAb) production. We developed a hybrid model describing the effects of multiple process variables on antibody productivity and impurity generation. An automated platform with 12 × 250 mL bioreactors was set up. Fed‐batch cultivation experiments were conducted using a newly developed CHO‐MK cell line. Six process variables were varied over a wide range, and experimental data under 29 different cultivation conditions were used for model development. An average R 2 value of 0.86 across all components and conditions was achieved with model fitting. Additional validation experiments under 15 cultivation conditions confirmed the model's high prediction accuracy. The model was then applied to identify optimal conditions that maximize mAb yield while constraining impurity concentrations. Based on the results, a design recommendation was proposed and validated experimentally. This study demonstrates that integrating model‐based simulations with automated experiments is effective for optimizing cell cultivation conditions.