Storing dNTPs at -70 or -20?
ahamel at mts.net
Sat Mar 2 13:23:30 EST 2002
What's the opinion out there regarding storing dNTPs
at -70 versus -20 (NOT frost free freezers of course)?
I've been in the mol bio field 20 years now and we have
always stored our stock solutions at -70 (for long term storage).
This had always seemed the "intuitively correct" thing to do.
The only stocks we ever stored at -20 (NOT frost free) were small
aliquots of "working" solutions (that is, were used frequently and
consequently were used up more quickly ... usually within a few weeks).
I've had far too many occassions when using dNTPs stored in frost free
freezer (usually by grad students) , only to have sequencing reactions
fail as result.
Now the kicker is, I recall having read a paper (BRL Focus?,
showing how dNTPs store better at colder temperatures.
Can anyone come up with any publications on this topic?
ThanX ... I will post any email responses if they are not posted
Andre Hamel (PCR scientist) Virology Lab,
Veterinary Services Branch, Manitoba Agriculture
Winnipeg, Manitoba, CANADA
mailto:ahamel at agr.gov.mb.ca
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