Agarose gel electrophoresis

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General Information

General Procedure

  1. Cast a gel
  2. Place it in gel box in running buffer
  3. Load samples
  4. Run the gel
  5. Image the gel


  • TAE - better resolution of fragments >4kb;
  • TBE - better resolution of 0.1-3kb fragments; TBE is better suited for high-voltage (>150V) electrophoresis than TAE because of its higher buffering capacity and lower conductivity;

Loading dyes

dye 0.5-1.5% agarose 2.0-3.0% agarose*
xylene cyanol 4000-5000 bp 750 bp
bromophenol blue 400-500 bp 100 bp

*sieving agarose

Specific Protocols

Endy:Agarose gel

Knight:Agarose gel electrophoresis