Biomass Monitoring

Biomass Monitoring designates real-time or at-line measurement of total cell mass or density in bioreactor cultures during biopharmaceutical manufacturing, providing critical information for controlling feeding strategies, predicting harvest timing, and ensuring consistent upstream process performance affecting final product quality and yield.

The biopharmaceutical industry employs diverse biomass monitoring technologies in cell culture and fermentation processes. Capacitance-based probes measure viable cell volume in real time without sampling, enabling continuous process monitoring and feedback control. Optical density measurement provides total cell mass but cannot distinguish viable from non-viable cells. Near-infrared spectroscopy with chemometric models estimates biomass from spectral signatures. Offline cell counting using haemocytometers or automated cell counters provides reference measurements. Process analytical technology integration connects biomass measurements with feeding controls, optimising nutrient addition based on actual cell growth rather than fixed schedules. As manufacturing intensification targets higher cell densities and continuous processing expands, robust biomass monitoring continues becoming increasingly important for process control.