Cell Culture Media Types and Selection: From Basic Formulation to Serum-Free Optimization

Basic composition and function of cell culture medium

Cell culture medium is a core solution system that provides nutrition, pH buffering, osmotic pressure maintenance, and growth factors when cells are cultured in vitro.Common cell culture media typically contain carbon sources such as amino acids, vitamins, inorganic salts, glucose, and pH-indicating ingredients such as phenol red.Some formulations also add serum, hydrolysate, or recombinant proteins to meet the adherence, proliferation, or differentiation needs of specific cell types.In R&D and production, the formulation design of the medium is directly related to cell state, product expression level and process robustness.

From the mechanism of action, amino acids and vitamins are mainly involved in protein synthesis and metabolic coenzyme function; inorganic salts maintain osmotic pressure and membrane potential; and buffer systems such as sodium bicarbonate or HEPES are used to stabilize the culture environment.When selecting a cell culture medium, it is necessary to first clarify whether the target cells are adherent or suspended growth, with or without special nutritional defects or metabolic characteristics.

Common media types and applicable scenarios

According to the source and component complexity, cell culture media can generally be divided into serum-containing media, low-serum media, serum-free media, and chemical composition-defined media.

Serum-containing medium: It provides abundant growth factors such as fetal bovine serum, which is suitable for a variety of adherent cells and primary cultures, but the batches vary greatly.

Low serum/serum-free medium: reduces or removes serum, reduces the risk of foreign factors, and is often used in the production of biological products such as antibodies and recombinant proteins.

Chemical composition limited medium: all components are clear and free of animal origin