Size selective DNA precipitation

Curators
Kersten S. Rabe

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Abstract
A very fast and easy method for the size-selective removal of smaller DNA from larger fragments. By adjusting the PEG concentration the range of precipitated DNA fragments can be adjusted.

Reagents

 * DNA to be separated (e.g. PCR reaction mixture)
 * 30% (w/v) PEG 8000/30 mM MgCl2 (concentration of PEG 8000 can be varied to shift the size of the percipitated DNA. The concentration used here will remove DNA fragments with less than 300bp)
 * TE Buffer, pH 8.0 (10 mM TRIS-HCl, 1 mM EDTA, pH 8.0)

Equipment

 * Centrifuge which can do up to 10.000 rcf (=g)
 * Appropriate tubes for the centrifuge
 * Pipettes
 * Vortexer

Procedure

 * Mix 50 μL of sample with 150 µL of TE
 * Add 100 µL of PEG/MgCl2
 * Vortex
 * Centrifuge 15 min at 10.000 rcf at roomtemperature
 * Carefully remove supernatant not to disturb the pellet, which will be invisible
 * Dissolve the pellet in a appropriate amount of buffer of choice

Critical steps

 * Before centrifugation mark the tubes in order to know where the pellet will be expected afterwards, as the pellet will be (nearly) invisible

Discussion
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BioCoder version
Following is the Size selective DNA precipitation protocol in BioCoder, a high-level programming language for expressing biology protocols. What you see here is the auto-generated text ouput of the protocol that was coded up in BioCoder (see Source code). More information about BioCoder can be found on my home page. Feel free to mail me your comments/ suggestions.Vaishnavi

Text Output
Size selective DNA precipitation protocol

Source Code
Size selective DNA precipitation protocol - source code