TMB (3, 3', 5, 5'-tetramethylbenzidine) is a chromogenic substrate for Horseradish Peroxidase (HRP). TMB produces a deep blue color during the enzymatic degradation of hydrogen peroxide by HRP, and the addition of a stop solution gives a clear yellow color that absorbs at 450 nm. This substrate gives higher signal and has a higher sensitivity in ELISA than OPD (ortho-phenylenediamine dichloride).
TMB PLUS2® characteristics are:
Medium sensitivity
Very low background
Aqueous based – no organic solvents (REACH Annex XVII compliant)
Low lot-to-lot variation
Suitable for use in electrochemical assays
Specifications
Available sizes:
100 mL, 500 mL, 1 L, bulk
Format:
Ready-to-use (RTU)
Stability:
4 years
Development time:
5-30 minutes
Stop solution:
0.2 M H₂SO₄