Loading dye

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Loading dye

  • Ficoll 400 (in 68-558F)
  • Deionized water
  • Orange G dye

Dissolve 1.5 g of Ficoll in 10 mL of deionized water. Add very small amounts of Orange G dye such that the loading dye is dark orange. Store in small aliquots at 4°C (room temperature is okay too). To use, add and mix 1/5th volume of loading dye to DNA solutions prior to loading into the wells of gels.

Other dyes

  • Bromophenol blue: purple, generally runs at ~500bp (depending on percentage agarose)
  • Xylene cyanol: blue, runs at ~4kb
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