Purpurin

Property Data Common name Suggested name Other names C.I. number C.I. name Class Ionisation Solubility aqueous Solubility ethanol Absorption maximum     Colour   Empirical formula Formula weight Purpurin Purpurin Alizarin purpurin 58205 & 75410 Natural red 8 & 16 Anthraquinone Acid Soluble at boiling Soluble 486, 521 (Conn) 456 alcohol (Conn) 485, 521 (Aldrich) Yellow (aqueous) Red (ethanol) C14H8O5 256.2

Purpurin is a natural dye and, along with alizarin is found in madder root (Rubia tinctorum L.), although it appears to form during storage. It is very similar to alizarin red S, and is used for much the same purpose as it also forms bright red lakes with calcium.

 

Reference
R. D. Lillie.
Conn's Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A.

Aldrich chemical catalogue, 1992
Aldrich Chemical Company, Milwaukee, WI, USA.

Susan Budavari, Editor, (1996)
The Merck Index, Ed. 12
Merck & Co., Inc., Whitehouse Station, NJ, USA

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