Cell culture medium
A nutrient-rich liquid or gel designed to support the growth, proliferation, and maintenance of cells in vitro. It typically contains essential nutrients, amino acids, vitamins, salts, and buffering agents, often supplemented with serum or serum replacements to enhance cell viability and performance.
What is the purpose of a cell culture medium?
Cell culture medium provides the essential environment for cells to grow and function outside the body. It mimics the in vivo conditions by supplying nutrients such as glucose, amino acids, and lipids, maintaining pH through buffers like HEPES or bicarbonate, and supporting osmotic balance. The formulation is tailored to the specific cell type—e.g., mammalian, insect, or plant cells—ensuring optimal metabolic activity and viability. Common base formulations include DMEM, RPMI-1640, and MEM, each optimised for different applications in research, biopharmaceutical production, and regenerative medicine.
How are cell culture media formulated and validated?
Formulation involves balancing growth factors, energy sources, and trace elements while minimising contaminants. Media are validated for sterility, endotoxin levels, and performance consistency using assays such as cell viability, proliferation rate, and metabolic activity. Regulatory compliance with standards such as ISO 13485, USP <111>, and EP <2.6.12> ensures quality. Manufacturers also provide certificates of analysis (CoA) and safety data sheets (SDS) to support traceability and safety, particularly in clinical and therapeutic applications.
Related concepts
Key considerations include serum-free and chemically defined media for reproducibility and reduced variability, especially in biomanufacturing. Media must be stored and handled under controlled conditions to prevent degradation. Compatibility with downstream processes such as cell harvesting, cryopreservation, and assay integration is also critical.