N-(3-Sulfopropyl)-3,3′,5,5′-tetramethylbenzidine sodium salt ;TMBZ-PS

4-Amino-4′-sulfopropylamino-3,3′,5,5′-tetramethylbiphenyl sodium salt; Sodium 3-((4′-amino-3,3′,5,5′-tetramethyl-[1,1′-biphenyl]-4-yl)amino)propane-1-sulfonate

N-(3-Sulfopropyl)-3,3′,5,5′-tetramethylbenzidine (TMB) sodium salt is a highly sensitive chromogenic substrate used for the detection and quantification of peroxidase enzyme activity. This water-soluble substrate undergoes a color change from colorless to blue upon oxidation by peroxidase enzymes in the presence of hydrogen peroxide. The reaction can be stopped by adding an acid, resulting in a yellow color that can be measured spectrophotometrically. TMB sodium salt is widely used in various applications, including enzyme-linked immunosorbent assays (ELISA), immunohistochemistry, and other diagnostic tests, due to its high sensitivity, low background signal, and excellent stability.