3D-NAA01490 - 235-triphenyltetrazolium-iodide

Triphenyltetrazolium bromide may be used to detect experimental cerebral infarction and biochemical analysis.

Tetrazolium Red is used to visualise dehydrogenase enzyme activity. Initially the tetrazolium solution is colorless but changes to red when it comes into contact with hydrogen. Tetrazolium red is used in a biochemical viability test for seeds. The test relies on dehydrogenase enzymes to release hydrogen ions which subsequently reduce the colorless tetrazolium salt solution to a red compound called formazan. Living cells turn red, while dead cells remain colorless.

Tetrazolium Red (2,3,5-Triphenyltetrazolium chloride) is used to visualize dehydrogenase enzyme activity.

The monotetrazolium salt  Iodonitrotetrazolium chloride (INT), first described by Atkinson et al. (1950), is an iodinated derivative of TTC (2,3,5-Triphenyltetrazolium chloride) with an absorption λmax of 248 nm. The color produced by reduction of this iodonitro compound is a red to purple or brownish formazan with an absorption maximum at 485 to 492 nm (depending on the solvent). INT is often used to visualize dehydrogenase activity histochemically as well as in Western blot staining and as a staining agent for agar colony formation assays.  NAD or NADP-dependent dehydrogenases activity assays: NAD+- or NADP+-dependent dehydrogenase transfers electrons from a substrate (the electron donor, e.g. succinate) to NAD+ or NADP+, forming NADH and NADPH, respectively. Then, the final transfer of hydrogen to the tetrazolium salt is catalyzed by NADH or NADPH dehydrogenases (e.g. succinate dehydrogenase), leading to the reduction of INT and formation of the water-insoluble INT-formazan. 1 mol of formazan is produced for each mole of succinate utilized in the presence of INT. It is important to mention for applications in histology, that INT-formazan precipitates at the site of this latter dehydrogenase but not at the site of the original NAD+- or NADP+-dependent dehydrogenase activity.