Liquid nitrogen at -196C, DMSO and the thawing step
Quick answer
Long-term stem cell storage uses liquid nitrogen at about -196C together with a cryoprotectant such as DMSO and a controlled-rate freeze. The step that most affects final quality is thawing, which must be fast and followed by correct removal of the cryoprotectant.
The core problem in freezing cells is ice crystals puncturing membranes. DMSO limits intracellular crystal formation but is itself toxic if left in contact at room temperature, so protocols control concentration, exposure time and cooling rate together.
A proper cell bank stores samples in the vapour phase of liquid nitrogen with 24-hour temperature monitoring, alarms and a backup tank. If you are banking cells, ask whether those systems exist and whether the contract states the storage term explicitly.
Banking means later rounds skip a new harvest, saving both time and a procedure. The trade-offs are the annual fee and the fact that cells banked at a younger age generally retain better proliferative capacity than cells collected later in life.
At liquid nitrogen temperature biological activity is essentially halted, so samples last many years, subject to the bank's contract.
Some loss always occurs, which is why post-thaw viability is tested before use.
Last updated: 2026-08-28 · This content is for information only and is not medical advice. Consult a qualified doctor before making treatment decisions.
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