DEPC vs. DMPC
jrt at home.com
Wed Aug 11 20:34:31 EST 1999
Nick Theodorakis <nicholas_theodorakis at urmc.rochester.edu> wrote:
>Since D(E/M)PC modifies nucleic acids as well, I would think that the
>greater instability of DMPC in water would be an advantage, since there
>would be a lesser chance that some would remain in solution when it came
>in contact with the RNA.
DEPC was used in chemical sequencing reactions where something like
10% DEPC and elevated temperature were required to get partial
reaction. So I don't think 0.05% DEPC on ice really poses much of a
chemical modification problem for RNA. DEPC-treated RNA is perfectly
fine for hybridization analysis. Nevertheless, I still avoid DEPC when
the downstream use is as a template of some kind.
As a compromise one might consider adding DEPC at an early lysis stage
and after allowing a short time for it to react with RNAses, and a
molar excess of histidine to scavenge the remaining DEPC.
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