Lidstrom: Agarose Gel Electrophoresis

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(Starting with an empty box)
(Tips)
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** Don't do this if you are going to cut & gel purify the band.  
** Don't do this if you are going to cut & gel purify the band.  
[[image:gel sat 16 hours between photos.jpg|thumb|center|gel sat 16 hours between photos]]
[[image:gel sat 16 hours between photos.jpg|thumb|center|gel sat 16 hours between photos]]
 +
* You don't need much DNA.  50 ng should be plenty.
 +
[[image:75 and 150 ng DNA on a gel.jpg|thumb|center|75 and 150 ng DNA on a 0.7% agarose gel]]

Revision as of 19:46, 31 March 2013

Return to Protocols

Starting with an empty box

  • Fill with TBE until it covers the gel holding tray.
  • Add 40 uL of ethidium bromide if your gels don't already have it mixed into the liquefied agarose.
    • If your buffer already has some ethidium bromide but it needs more, 20 uL is probably good.
  • Load sample
    • 1.7 uL of a PCR product is usually plenty
  • Load ladder
    • If using MassRuler, 4 uL is good for skinny lanes.
  • Run @ 110 V for 20 min and check the gel.
    • 40 min is pretty safe for 0.7 - 1% agarose gels

Imaging

  • Exposures should be < 0.5 seconds to minimize background emissions. If you need longer, you probably should have had more ethidium bromide.


Tips

  • If you have a voltage source that will stop after a set amount of time, feel free to run your gel as you leave and image it in the morning. Diffusion of bands shouldn't be a big problem unless they are << 500 bp.
    • Don't do this if you are going to cut & gel purify the band.
gel sat 16 hours between photos
gel sat 16 hours between photos
  • You don't need much DNA. 50 ng should be plenty.
75 and 150 ng DNA on a 0.7% agarose gel
75 and 150 ng DNA on a 0.7% agarose gel
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