ONPG (o-Nitrophenyl-beta-D-galactoside, 2-Nitrophenyl-beta-D-galactopyranoside)

A colorimetric substrate for beta-D-glucuronidase used in the identification of E. coli and Salmonella. Synonyms: o-Nitrophenyl-beta-D-galactoside, 2-Nitrophenyl-beta-D-galactopyranoside, CAS No: 369-07-3, Molecular Formula: C12H15NO8, Molecular Weight: 301.26, Appearance: White to off-white crystalline powder, Purity (HPLC): >99%, Identity (IR): Conforms to reference, Melting Point: 195°C (dec), Solubility (1%, H2O): Colorless to slight yellow, clear, complete, DMSO (Slightly), Water (Slightly, Sonicated), Turbidity (1%, H2O): <4NTU, Water (KF): <0.5%, Specific Rotation (C=1,H2O): [a]D: -68.0 ± 3°, Free o-Nitrophenol: <0.03%, Bromine: <2300mg/Kg, Aluminum: <560mg/Kg