Thermo Scientific SuperSignal Molecular Weight Protein Ladder (20 to 150K) is a mix of eight unstained recombinant proteins with IgG-binding sites for chemiluminescent, fluorescent, chromogenic or other detection systems. The protein standard is supplied in a ready-to-use format for direct loading onto gels; no need to heat, reduce, or add sample buffer prior to use.

Compare and view all other protein standards and ladders ›

The ladder’s recombinant proteins bind to the antibodies used in the western blot through the IgG binding site. The protein markers can then be visualized using appropriate substrates for enzyme-labeled antibodies or via fluorescent dye-labeled antibodies (not recommended for antibodies labeled with fluors in the 500–550 nm channel).

Two versions of the MW marker are offered. This formulation is appropriate for use with most rabbit and other non-mouse polyclonal antibodies. SuperSignal Enhanced Molecular Weight Protein ladder is formulated specifically for applications requiring mouse monoclonal antibodies and experiments where very dilute antibody concentrations are used. For example, the enhanced standard may be necessary when using a 1:50,000 (25 ng/mL) to 1:100,000 (10 ng/mL) dilution of secondary antibody.