Thermo Scientific™ PageRuler™ Unstained Broad Range Protein Ladder

A mixture of 11 proteins (5 to 250kDa) for use as size standards in protein electrophoresis (SDS-PAGE) and Western blotting.

Brand: Thermo Scientific™

Manufacturer Part Number: 26630

X2 Fermentas PageRuler(TM) Broad Range Unstained

UNSPSC: 41105337

Code: PN

Additional Details:
Additional Details: Weight: 0.01000kg

Product Code. 11892124

Quantity Price
1 £59.00 / Pack of 2
EU Stock 49
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Description and Specification


Description PageRuler Unstained Broad Range Protein Ladder
Detection Visible
Formulation 11 proteins from 5 to 250kDa in reducing sample buffer
Quantity 2 × 250mL
Separation Range Broad
Stained Unstained
Sufficient For 50 to 100 mini gel lanes at 5 to 10μL per lane

The protein MW markers in this ladder resolve into clearly identifiable sharp bands ranging in size from 5kDa to 250kDa when analyzed by SDS-PAGE and stained with coomassie dye or silver. The 100, 50 and 20kDa protein bands are of greater intensity and serve as reference bands. Proteins can be detected on Western blots by staining with Ponceau S, coomassie blue or other protein stains. In addition, the ladder proteins (except for the 5kDa peptide) contain an integral Strep-tag™ II Sequence and may be detected on Western blots using Strep-Tactin™ Conjugates. The PageRuler Unstained Broad Range Protein Ladder is supplied ready-to-use: no heating, dilution or addition of a reducing agent is required before use.


  • Size range – eleven proteins spanning 5 to 250kDa

  • Ready-to-use – supplied in a loading buffer for direct loading on gels; no need to boil

  • Sharp bands – excellent accuracy for detection in with coomassie or silver stains

  • Reference bands – the 100, 50 and 20kDa bands are more intense for easy orientation

  • Tagged – each protein in the ladder contains an integral Strep-tag™ II Sequence

  • Quality tested – each lot evaluated by SDS-PAGE and Western blotting


Proteins in 62.5mM Tris-H3PO4 (pH 7.5 at 25°C), 1mM EDTA, 2% SDS, 100mM DTT, 1mM NaN3, 0.01% bromophenol blue and 33% glycerol.

Recommended for:

Accurate protein sizing on SDS-polyacrylamide gels and Western blots