freeze chloroquine stock

Nico Dantuma nico.dantuma at
Mon Jul 6 11:16:07 EST 1998


For DEAE-dextran transfection of COS cells, I routinely make a fresh 40 mM
chloroquine solution in PBS which is eventually diluted in the medium. This
is according to the standard protocol of Cullen in Meth. Enzym. Yet, I
noticed that in the commercial DEAE-dextran transfection kits the
chloroquine solution is stored at -20oC. Can I also freeze the stock
solution or is it really necessary to prepare each time a fresh solution?
What is the logic behind using fresh choloroquine solutions?

Thanks in advance.


Nico Dantuma
Microbiology and Tumorbiology Center
Karolinska Institute
Box 280
S-171 77 Stockholm
Phone: +46 8 7286280; fax: +46 8 331399

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