In article <49g19c$184g at pulp.ucs.ualberta.ca> msingh at gpu4.srv.ualberta.ca (Madhu Singh) writes:
>Recently someone had asked about a isopropanol using container to freeze
>cultured cells. The company which supplies this container is Nalgene,
>and the container is called "Cryo 1C Freezing Container" (cat # 5100-0001).
>>Hope you find this information useful.
I had an inexpensive method for slow freezing cells in DMSO. I placed
the cryo-vials in the holes of a foam 15-ml centrifuge tube rack (e.g.
orange rack) and covered with a second rack. Wrap the whole thing in a
plastic bag and put into the -70 freezer overnight.
The next day, put the frozen cells in the liquid nitrogen.
This method worked for me quite well, and I never noticed a significant
loss of viability over other slow freezing methods (e.g. elevators in the
Dewar or programmed freezers).