Protein MW Marker, Ladder, Prestained, 10-170kD

Blue Ice

Supplied as a liquid in 62.5mM Tris-H3PO4, pH 7.5, 1mM EDTA, 2% SDS, 10mM DTT, 1mM sodium azide, 33% glycerol

Prestained Protein Ladder, 10-170kD is a mixture of 10 recombinant, highly purified colored proteins, designed for monitoring of protein separation during SDS-PAGE, verifying Western transfer efficiency and approximating the molecular weight of blotted proteins. Proteins are covalently coupled with a blue chromophore except two reference one - ~70kD, (orange) and ~10kD (green). The Prestained Protein Ladder is supplied in gel loading buffer and is ready-to-use.

Note: 250ul is sufficient for 50 mini-gel applications (5ul/well) or 25 large gel applications (10ul/well)

5ul of Prestained Protein Ladder provide 10 bands of equal intensities in 4-20% SDS-PAGE (Tris-glycine buffer) and after electrotransfer onto PVDF membrane.

Applications:
Suitable for use in monitoring of protein separation during SDS-PAGE (1); Verifying Western transfer efficiency (2, 3); Approximating the molecular weight of blotted proteins.

Protocol:
1. Thaw Ladder at RT. Do not boil!
2. Mix gently, but thoroughly to ensure the solution is homogeneous.
3. Load the Ladder on a gel and run. (Load volume: 5ul for mini-gels, ; 10ul for large gels, use same volumes for blots).
4. After run is complete, stain gel or perform Western transfer procedure as desired.

Note:
• <10% gels may cause proteins with low molecular weights to migrate with the dye front.
• Loading volumes are intended for use in gels with a thickness of 0.75mm. If thicker gels are used, the loading voume should be increased.
• Prestained Protein Ladder could be used in Western Blot with all common membranes: PVDF, nylon and nitrocellulose.
• Longer transfer times or higer voltages may be required for Western Blot of large (>100kD) proteins.

Storage and Stability:
May be stored at 4°C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Aliquots are stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.