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- From: wmelchior@ntet.nctr.fda.gov
- Newsgroups: bionet.molbio.methds-reagnts
- Subject: Re: dye removal from ABI terminator reactions.
- Message-ID: <1992Nov23.105637.59@ntet.nctr.fda.gov>
- Date: 23 Nov 92 10:56:37 -0600
- References: <9211192226.AA14131@deimos.med.pitt.edu>
- Distribution: bionet
- Organization: NATIONAL CENTER FOR TOXICOLOGICAL RESEARCH
- Lines: 24
-
- > We now routinely purify the excess dye from reactions using home (lab)-made
- > quick spin columns. They may not overcome the tedium but they sure are
- > cheap. We make a hole in the bottom of 0.5 ml eppendorf using a 26 g needle
- > and add about 25 ul volume of zirconium glass beads. Then I pour sephadex
- ^^^^^^^^^
- > G-50 in 0.3M NaAc (5g in 60 ml) to the top of the tube. Stick the small
- > eppendorf inside a 2 ml tube and spin at about 500 rpm for couple of minutes.
- > Now the tube is transferred to a new 1.5 ml tube and the sample is added on
- > top. Now I spin at about 1500 rpm for couple of minutes.
- > The eluate is precipitated by atleast 3 volumes of isopropanol washed with
- > 70% etoh and resuspended for loading.
-
- Raj-
- Thanks for the method. One question: why _zirconium_ glass beads?
- Wouldn't regular glass work as well? And what size beads do you use?
- ________________________________________________________________________________
- The opinions stated are mine, not those of NCTR or its sponsoring organizations.
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- Bill Melchior || OMNISCIENCE
- National Center for Toxicological Research || Knowing what
- Jefferson, AR 72079 || thou knowest not
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- WMELCHIOR@NTET.NCTR.FDA.GOV || from Grooks, Piet Hein
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