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Orange II

Orange II

Class: Azo
Ionisation: Acid

Chemical structure of Orange II

Common Name: Orange II
Suggested Name: Orange II
Other Names:

C.I. Number: 15510
C.I. Name: Acid orange 7
Color: Orange
Solubility Aqueous: 5%
Solubility Ethanol: 5%
Absorption Maximum: 484 (Merck), 483 (Aldrich)
Empirical Formula: C16H11N2NaO4S
Formula Weight: 350.33

Description

Orange II is not commonly used in medical histotechnology. Lillie has recommended it as a substitute for Orange G in Pearse’ PAS Orange G method for demonstrating pituitary α and β cells because it is a darker orange.

References

  1. Susan Budavari (Editor), (1996)
    Merck Index, Ed. 12
    Merck & Co., London, New Jersey, USA.
  2. Aldrich chemical catalogue, 1992
    Aldrich Chemical Company, Milwaukee, WI, USA.