CA Index Name: 3H-Phenoxazin-3-one, 7-hydroxy-, 10-oxide, sodium salt (1:1)
Other Names: 3H-Phenoxazin-3-one, 7-hydroxy-, 10-oxide, sodium salt; Resazurin sodium salt; Sodium resazurin
Merck Index Number: Not listed
Chemical / Dye Class: Phenoxazine
Molecular Formula: C12H6NNaO4
Molecular Weight: 251.17
Physical Form: Dark green to black powder
Solubility: Soluble in water; slightly soluble in ethanol, acetic acid; insoluble in ether
Melting Point: > 250 °C
pH Range: 3.8-6.5
Color Change at pH: Orange (3.8) to dark violet (6.5)
pKa: 6.71
Absorption (λmax): 598 nm, 380 nm
Synthesis: Synthetic methods
Staining Applications: D-Arabinitol; bacteria; hypoxic cells; microorganisms; hairs
Biological Applications: Detecting bile acids, glycosidase activity; as hydrolase substrate; in beer production; treating diabetic complications; enzymatic microplate assay; β-glucosidase assay; glutathione transferase assay
Industrial Applications: Electrochemichromic devices; oxygen-barrier packaging materials
Safety / Toxicity: No data available
Certification / Approval: Certified by Biological Stain Commission (BSC)