The 48-well plate is a multiwell format positioned between the 24-well and 96-well plates, offering intermediate throughput for cell and tissue culture experiments. It is widely used when moderate numbers of samples are required, but reagent consumption and space limitations make larger formats impractical. Typical working volumes are on the order of 0.2–0.5 mL per well, with a growth surface area of approximately 1 cm², making the format suitable for a broad range of cellular and molecular assays.

Materials and Manufacturing

Forty-eight-well plates are generally manufactured from optical-grade polystyrene, selected for its clarity, chemical inertness, and compatibility with biological systems. The polymer conforms to established biocompatibility standards suitable for direct contact with cells and culture media. Its optical properties permit reliable microscopic observation, while mechanical stability supports routine handling, incubation, and centrifugation. Manufacturing is controlled to ensure consistent well geometry, surface uniformity, and low levels of extractable substances.

Surface Treatments

Surface chemistry strongly influences cell behavior in 48-well plates. Non-treated plates retain a hydrophobic surface that minimizes protein adsorption and cell attachment, making them suitable for suspension cultures. Tissue-culture-treated plates undergo physical or chemical modification that introduces hydrophilic functional groups, promoting serum-protein adsorption and integrin-mediated adhesion of common adherent cell lines. Advanced superhydrophilic treatments further improve attachment and growth of fastidious cells, primary cells, and transfection cell lines, particularly under low-serum or serum-free conditions.