Lidstrom: Agarose Gel Electrophoresis: Difference between revisions
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** click the gel electrophoresis button on the left | ** click the gel electrophoresis button on the left | ||
== Imaging == | == Imaging == | ||
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** Don't use a previously used gel for DNA you will cut and purify for cloning/sequencing. | ** Don't use a previously used gel for DNA you will cut and purify for cloning/sequencing. | ||
** Drain with 100V for ~90 min. | ** Drain with 100V for ~90 min. | ||
== OLD: Ethidium bromide instructions == | |||
If 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 |
Revision as of 12:14, 27 January 2014
Return to Protocols
- handy link: gel electrophoresis
- click the gel electrophoresis button on the left
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.
- You don't need much DNA. 50 ng should be plenty.
- TBE buffer can be re-used for months.
- This is nice, because you shouldn't dump ethidium bromide containing solution down the drain.
- Janet usually uses it heavily for 4+ months before replacing it.
- Always add DI water to replace evaporated water, not TBE buffer
- Agarose gels can be "drained" and re-used several times.
- Don't use a previously used gel for DNA you will cut and purify for cloning/sequencing.
- Drain with 100V for ~90 min.
OLD: Ethidium bromide instructions
If 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