Osmolality and pH are important cell culture process parameters, key elements that are often examined and optimized to improve the productivity of cell-culture–based bioprocesses. Osmolality affects cell viability and growth by regulating the transport of water and nutrients through cell membranes and pH maintains the isotonicity of a culture. To monitor these parameters in cell culture, samples are typically withdrawn and passed through a multifunction analyzer as the BioProfile 400 instrument from NOVA Biomedical (www.novabiomedical.com). Withdrawing samples during a bioreactor…