Moving a mammalian cell culture process from shake flask to bioreactor is more than a scale-up exercise. Each transition introduces new challenges in oxygen transfer, pH control, CO₂ management, mixing, and data reproducibility. This practical guide explores the key stages of cell culture process development, explains why process transfer often fails, and shows how integrated bioreactor control and data management help create scalable, reproducible processes from screening through scale-up.

A bioreactor provides an ideal environment where cells can focus on what they are supposed to do: proliferate. Like lab workers, cells can only produce consistently good work if the conditions are right: it should not be too hot or too cold, and they have to have enough nutritious food and fresh air. In terms of a bioreactor, this means maintaining pH, temperature, ensuring sufficient gas supply and, depending on how the instrument has been configured, adding nutrients for successful maintenance of growth.