Hot Start Wax Beads
ah8 at stir.ac.uk
Tue Mar 3 17:49:09 EST 1998
Yes indeed! - I can confirm that trying to pipette molten wax accurately
is a shortcut to mental illness. Even using a balance I've never
achieved better than +/-2% whereas Perkin Elmer's pellets are almost
spot on: better than +/- 0.3% I guess that's what we're paying for.
I really don't know if it needs to be this accurate: I went to all this
fuss because I was running RAPD's which can be quite sensitive to the
total volume in the tube. I've found +/- 2% is close enough to give me
reproducible RAPD's so probably someone running a more forgiving PCR
could afford to be less meticulous.
Also I imagine PE's is purer than most: I got mine from the histology lab
next door - it's the paraffin wax they embed tissue samples in for
cutting sections. I've always heated it to 110C for an hour to get rid
of any volatiles, no doubt that will still leave a few things that
could conceivably affect a PCR, but thus far I've had no problems.
Institute of Aquaculture
University of Stirling
Scotland, FK9 4LA
On Wed, 25 Feb 1998, Dr. Duncan Clark wrote:
> Hi Alastair,
> What is the source of Wax you use. I tried the odd one in the past but
> the problem was getting reproducible sized pellets even with an
> autopipettor. Weighing may be the only answer.
> The problem with being on the cutting edge is that you occasionally get
> sliced from time to time....
> Duncan Clark
> DNAmp Ltd.
> TEl/FAX 01252376288
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