BlueRAY prestained protein ladder, 500ul
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• 3 μl or 5 μl per loading for clear visualization during electrophoresis on 15-well or 10-well mini-gel, respectively• 2~3 μl per well for general Western transfering.

• Apply more for thicker (>1.5 mm) or larger gel.


The BlueRAY Prestained Protein Ladder is a three-color protein standard with 10 pre-stained proteins covering a wide range molecular weights for 10 to 180 kDa.
Proteins are covalently coupled with a blue chromophore except for two reference bands (one green and one red band at 25 kDa and 75 kDa
respectively) when separated on SDS-PAGE (Tris-glycine buffer).
The BlueRAY Prestained Protein Ladder is designed for monitoring protein separated during SDS-polyacrylamide gel electrophoresis, verification of Western transfer efficiency on membranes (PVDF, nylon , or nitrocellulose) and for approximate sizing of proteins.
The ladder is supplied in gel loading buffer and is ready to use. Do not heat, dilute, add reducing agent before loading.


Approximately 0.2~0.4 mg/ml of each protein in buffer (20 mM Trisphosphate pH 7.5 at 25°C), 2% SDS, 1 mM 2-Mercaptoethanol, 3.6 M Urea, and 15% (v/v) glycerol).

Quality Control

5 μl of BlueRAY Prestained Protein Ladder resolves 10 bands in 4-20% SDS-PAGE (Tris-glycine buffer) and after Western blotting to PVDF membrane.


Stable for up to 2 weeks at 25°C
Stable for up to 3 months at 4°C
For long term storage, store at -20°C

Guide for Molecular Weight Estimation (kDa)

Migration patterns of BLUeye Prestained Protein Ladder in different electrophoresis conditions are listed below:


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