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Indophenol molecule
CAS number 500-85-6
PubChem 10379
ChemSpider 9951 YesY
Jmol-3D images Image 1
Molecular formula C12H9NO2
Molar mass 199.21 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Indophenol is an artificial blue metachromatic dye, obtained by the action of phenol on certain nitrogenous derivatives of quinone.[1] Indophenol resembles the color indigo in appearance. Dichlorophenol-indophenol (DCPIP), a form of indophenol, is often used to determine the presence of vitamin C, or ascorbic acid.[2]

The formation of indophenol is used to determine ammonia and paracetamol by spectrophotometry.[3]

Indophenol blue (CAS 132-31-0) is a completely different molecule with systematic name N-(p-dimethylaminophenyl)-1,4-naphthoquinoneimine.[4]


  1. ^ Definition of indophenol from
  2. ^ Ascorbic acid and indophenol
  3. ^ Tsuboi, T.; Hirano, Y.; Shibata, Y.; Motomizu, S.: Sensitivity Improvement of Ammonia Determination Based on Flow-Injection Indophenol Spectrophotometry with Manganese(II) Ion as a Catalyst and Analysis of Exhaust Gas of Thermal Power Plant, Analytical Sciences, October 2002, Vol. 18, pp. 1141/4
  4. ^ Systematic name of idophenol blue