CAS Registry Number

CAS 4264-83-9 — 4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP)

4-Nitrophenyl phosphate disodium salt hexahydrate (PNPP) is a water-soluble substrate used in enzymatic assays, particularly for measuring alkaline phosphatase activity. It is a yellow compound that produces a colored product upon enzymatic hydrolysis, enabling spectrophotometric detection. CAS: 4264-83-9, Molecular Formula: C6H4NNa2O6P · 6H2O, Molecular Weight: 371.14 g/mol, Storage: 2 to 8 °C, Signal Word: Warning. Molekula supplies PNPP from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: p-Nitrophenyl Phosphate Liquid Substrate System - Sigma N7653