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Understanding Osmolality as a Critical Process Parameter in Mammalian Muscle Cell Culture and Biomanufacturing
1James Watt School of Engineering, University of Glasgow, Glasgow, Scotland G12 8QQ, U.K.
ACS Omega
|August 8, 2026
Summary
Osmolality is a critical parameter in mammalian cell culture, impacting cell proliferation and differentiation. Understanding and controlling osmolality is key for robust bioprocess engineering and cultured meat development.
Area of Science:
- Physicochemical basis of osmolality and its measurement challenges in complex cell culture media.
Background:
- Osmolality is an underrecognized parameter in bioprocess engineering.
- Mammalian muscle cells have a narrow osmolality operating window affecting key functions.
Purpose of the Study:
- To comprehensively establish the importance of osmolality in mammalian cell culture.
- To provide a framework for osmolality control in bioprocess engineering.
Main Methods:
- Review of physicochemical principles of osmolality.
- Synthesis of evidence on osmolality effects on muscle cell biology.
- Analysis of osmolality drift drivers in cell culture.
- Introduction of media composition as an engineering framework.
Main Results:
- Measurement fidelity is crucial for interpreting osmolality data.
- Osmotic excursions impact muscle cell proliferation, differentiation, and fusion.
- Media components consume an 'osmotic budget,' constraining formulations.
- CO2/bicarbonate coupling, temperature, evaporation, and scaffold interactions drive osmolality drift.
Conclusions:
- Time-resolved osmolality measurement can serve as a bioprocess indicator.
- Principles derived are applicable to cultured meat and general cell/tissue culture.
- Robust process control requires formal treatment of osmolality as a control variable.
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