CAS Registry Number

CAS 298-83-9 — NBT (Nitroblue tetrazolium chloride)

Nitroblue tetrazolium chloride (NBT) is a yellow, water-soluble dye widely used as a histochemical stain and redox indicator in biochemical assays, particularly for detecting superoxide anion production and in cell viability tests. It forms a dark blue diformazan precipitate upon reduction, enabling qualitative and quantitative analysis in research and diagnostics. Catalogue details: CAS 298-83-9, molecular formula C40H30Cl2N10O6, molecular weight 817.64 g/mol, stored at 2–8°C. Hazard classification includes the signal word *Danger* due to its toxicity and environmental risks. Molekula supplies NBT from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: NBT (Nitroblue tetrazolium chloride) water 4% max.