Protocol: - Remove and discard culture medium.
- Briefly rinse the cell layer with 0.25% (w/v) Trypsin - 0.53% mM EDTA solution to remove all traces of serum which contains trypsin inhibitor.
- Add 2.0 to 3.0 ml of Trypsin-EDTA solution to flask and observe cells under an inverted microscope until cell layer is dispersed (usually with 5 to 15 minutes).
Note: To avoid clumping do not agitate the cells by hitting or shaking the flask while waiting for the cells to detach. Cells that are difficult to detach may be placed at 37C to facilitate dispersal. - Add 6.0 to 8.0 ml of complete growth medium and aspirate cells by gently pipetting.
- Add appropriate aliquots of cell suspension to new culture vessels.
- Place culture vessels in incubators at 37C.
Subcultivation ratio: A subcultivation ratio of 1:4 to 1:6 is recommended
Medium renewal: 2 to 3 times per week