Thermo Scientific Pierce TMB ELISA Substrates detect horseradish peroxidase (HRP) activity, yielding a blue color (Amax = 370nm and 652nm) that changes to yellow (Amax = 450nm) upon addition of a sulfuric or phosphoric acid stop solution.
TMB is the most popular chromogenic substrate for HRP detection in ELISA and is available in several formats. The Pierce 1-Step TMB Substrates are one-component substrates that require no preparation before use. Unlike other commercially available substrates, these products contain no DMF or DMSO.
- Available in traditional or ready-to-use formulations
- No additional reagents or filtering required
- Non carcinogenic
- Various levels of sensitivity and development speed to suit any assay
- No DMF or DMSO present in the reagents
|Comparison of sensitivities of Thermo Scientific TMB ELISA Substrates.
Thermo Scientific Pierce 1-Step Ultra TMB yields the greatest sensitivity among the TMB substrates, followed by 1-Step Turbo TMB and 1-Step Slow TMB. The sensitivity of the 1-Step Turbo TMB is similar to OPD-based substrates formulated at approximately 1mg/mL. 1-Step Slow TMB has intermediate sensitivity – more sensitive than ABTS, but less sensitive than o-phenylenediamine dihydrochloride (OPD) or 1-Step Turbo TMB. The 1-Step Slow TMB is an ideal substrate for kinetic studies.
|Comparison of sensitivities of Thermo Scientific 1-Step Turbo TMB, Slow TMB and ABTS ELISA Substrates.
TMB (3,3′,5,5′-tetramethylbenzidine) is a chromogen that yields a blue color when oxidized, typically as a result of oxygen radicals produced by the hydrolysis of hydrogen peroxide by HRP. For kinetic or non-stopped ELISA assays, the TMB chromogen has maximal absorbances at 370nm and 652nm. The color then changes to yellow with the addition of sulfuric or phosphoric acid with maximum absorbance at 450nm. A green reaction product may result from partial conversion to the yellow product from the blue intermediate. TMB is very sensitive ELISA substrate and is more quickly oxidized than other HRP substrates, resulting in faster color development.
|Thermo Scientific 1-Step Ultra TMB-ELISA Substrate produces more signal than competing products.
|Thermo Scientific 1-Step Ultra TMB-ELISA Substrate provides better signal-to-noise ratio than competing products.
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Selection Guide to Enzyme Substrates for ELISA
Spike-and-recovery and linearity-of-dilution assessment
Precipitating TMB Substrates for Western blotting
Coated and Uncoated Microwell Plates