Related Experiment Videos
[Tetramethylbenzidine--a chromogenic substrate for peroxidase in enzyme immunoassay].
B Porstmann1, U Evers, E Nugel
1Institut für Pathologische und Klinische Biochemie, Humboldt-Universität zu Berlin.
Zeitschrift Fur Medizinische Laboratoriumsdiagnostik
|January 1, 1991
Summary
3,3
Area of Science:
- Biochemistry and Molecular Biology
- Enzyme Assays
- Immunohistochemistry
Context:
- Horseradish-peroxidase (HRP) is a widely used enzyme marker in immunoassays.
- Chromogenic substrates are essential for detecting HRP activity.
- Traditional substrates like o-phenylenediamine have limitations.
Purpose:
- To evaluate 3,3',5,5'-tetramethylbenzidine (TMB) as a superior chromogenic substrate for HRP.
- To compare TMB's sensitivity and performance against o-phenylenediamine in enzyme immunoassays (EIA).
- To assess TMB's suitability for histochemistry and EIA applications.
Summary:
- 3,3',5,5'-tetramethylbenzidine (TMB) demonstrates higher sensitivity than o-phenylenediamine in HRP-based enzyme immunoassays (EIA), including those for alpha-1-fetoprotein and myoglobin.
- Optimal peroxide concentration and reaction time are critical for maximizing TMB sensitivity in different assays.
- TMB is also effective for histochemistry when using hydrochloric acid as a stopping reagent.
Impact:
- TMB offers enhanced sensitivity and safety, making it a preferred chromogenic substrate for HRP detection.
- Its lack of mutagenic properties distinguishes it from other available substrates.
- This research supports the adoption of TMB for more sensitive and safer biochemical and immunological assays.