Xylene cyanol is most commonly used as an agarose gel electrophoresis size marker. It runs alongside different DNA length markers depending on the % of the agarose gel (while it's own molecular weight is around 540g/mol).
- 4000-5000 bp at 0.5-1.5%
- 750 - 200 bp at 2.0-3.0%
- CAS 2650-17-1
- e.g. Sigma Xylene Cyanol FF X4126 10g at around €50