Thawing Cells: Cell Culture Basics

Wear appropriate PPE and review MSDS for DMSO and freezing medium toxicity. Clean and set up the cell culture hood before retrieving cells from liquid nitrogen storage.

Working quickly, remove the cell vial from liquid nitrogen storage and place it in a cup of dry ice to maintain cold temperature during transit to the water bath.

Submerge the vial in a 37°C water bath without fully submerging it to prevent contamination. Remove the vial when a small ice chunk remains inside, as residual ice will melt during transport to the hood.

Wipe the vial with ethanol and place in the culture hood. Transfer cell contents to a 15 mL centrifuge tube using a small pipette, then add 10 mL pre-warmed medium drop by drop, gradually increasing the rate to avoid osmotic shock.

Spin the cells in a centrifuge to remove the toxic DMSO-containing freezing medium. Speed and duration vary by cell type; delicate cell lines may skip this step per laboratory manager instructions.

Carefully discard the medium without disturbing the cell pellet. Re-suspend cells in the appropriate volume of pre-warmed complete medium, typically 10 mL, adjusted based on cell count and optimal seeding density.

Use a north-south, west-east rocking motion to ensure even cell and solution distribution in the flask. Check cells a few hours later or the next day for proper adhesion and morphology.