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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!biosci!MED.PITT.EDU!bsh
- From: bsh@MED.PITT.EDU (Basavaraju Shankarappa)
- Newsgroups: bionet.molbio.methds-reagnts
- Subject: dye removal from ABI terminator reactions.
- Message-ID: <9211192226.AA14131@deimos.med.pitt.edu>
- Date: 19 Nov 92 22:26:11 GMT
- Sender: daemon@net.bio.net
- Distribution: bionet
- Lines: 32
-
- From: scarr@kean.ucs.mun.ca
- Subject: Removing dye from 373A reactions
-
- >Has anyone found a cheap, quick, reliable way of removing excess dye
- >terminators from a Cycle Sequencing reaction for an ABI373A sequencer?
- >We usually use an isopropanol extraction, but this seems to leave
- >variable amounts of the dyes behind. The ABI recommended BioSpin columns
- >do a better job, but they are costly and the ritual is slow & tedious.
- >Anyone had any experience with other commerical columns?
- >Steve Carr
-
- 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.
-
- I intend to have large number of colmumns poured and stored at 4 C.
- I think it can be done. But I havenot done it yet. This way, all I have
- to do is do a quick spin, exchange the tubes add sample spin and ppt.
- I get my zirconium beads from Biospec products PO Box 772 Bartelsville
- OK 74005. (918)-336-3363. Cat # 11079-101. $20.00 a pound; lasts for a
- life-time.
- Raj Shankarappa
- bsh@med.pitt.edu
- Univ of Pittsburgh
-
-