How to get aliquots from frozen serum samples?

hroychow from via (by hroychow from
Tue Aug 21 09:55:01 EST 2007

If you are interseted in a few microliters for the ELISA, then imply use
the tip to scrape and transfer the scarpings to an eppi tube!  That should
give you anywhere between 5 and 15uL.

> Dear experts,
> we want to analyze about 70 serum samples which currently are stored
> in cryotubes (about 2ml) and which are frozen at -80. I am looking for
> suggestions on how to obtain small aliquots (sufficient for a few
> ELISAs, less than 100ul in total) without actually thawing all the
> material.
> I thought of drilling holes into the frozen samples with a drilling
> machine and pre-chilled ("-frozen") spiral drills and to collect the
> chips, but am somewhat concerned of contaminating the samples with
> metal abrasions or oil from the surface of the drills. I could clean
> the drills in the dishwasher before and autoclave them, but that won't
> solve the possibility of metal abrasions.
> Has anyone out there solved a similar problem and would like to give
> some recommendations?
> Many thanks!
> Wolfgang
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