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≥98.0% (NT)

TMB substrate, TMB, Sure Blue TMB, BM blue, TMB Blotting Plus
Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


≥98.0% (NT)




UV/Vis spectroscopy: suitable


166-171 °C
168-171 °C (lit.)

storage temp.


SMILES string




InChI key


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3,3′,5,5′-Tetramethylbenzidine has been used as a substrate for peroxidase in:
  • enzyme-immunoassay (EIA)
  • indirect competitive enzyme-linked immunosorbent assay (ELISA)
  • sandwich enzyme-linked immunosorbent assay

3,3′,5,5′-Tetramethylbenzidine (TMB) is a noncarcinogenic substitute (Ames test negative) for benzidine suitable as peroxidase substrate for use in ELISA procedures. The substrate produces a soluble end product that is pale blue in color and can be read spectrophotometrically at 370 or 620-650 nm. The TMB reaction may be stopped with 2 M H2SO4 (resulting in a yellow color), and read at 450 nm. A sensitive and specific reagent for the detection of blood, assay of hemoglobin, assay of peroxidases.

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

Certificate of Origin

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