Method: Preparation of Lymphoblastoid Cell Lines for Long Term StorageMay 30, 1990
Rosalie Veile
Purpose:
- To store cell lines in a form that will insure recovery with high viability.A culture in logarithmic phase of growth with a total volume of 80-100 ml/T-75 flask should yield enough cells to freeze 10 ampules (1.0 ml/ampule). Cells should have a count of 4 X 106 cells/ampule to 9 X 106 cells/ampule. Too high or too low a cell count lowers recovery viability. Cell are frozen in RPMI-1640 with 15% Fetal Bovine Serum + 10% DMSO. Cultures are frozen slowly using a Model 700 Controller freezing chamber. This precision electronic device automatically controls the injection of liquid nitrogen into the freezing chamber to provide a 1 degrees C/minute freezing rate from +4 degrees C to -45 degrees C (with automatic heat of fusion compensation), then a 10 degrees C per minute freezing rate to -90 degrees C. Frozen ampules should be stored in liquid nitrogen for long term storage or in a -135 degrees C Cryopreservation System. Note: Cryotubes should be labelled with cell line number anddate prior to beginning this procedure.
Time required:
