Neutral Red

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
Neutral red
Neutral red
Toluylene red
Nuclear fast red
Kernechtrot
50040
Basic red 5
Eurhodin
Basic
5.6% (Conn)
4% (Merck)
2.4% (Conn)
1.8% (Merck)
540-542 (Conn)
533 (Merck)
529 (Gurr)
Red
C15H17N4Cl
288.8

This dye has been widely used in many staining methods, but its commonest use is probably as a simple red nuclear counterstain. It is an indicator as well as a dye. It changes from red to yellow over the pH range 6.8 - 8.0. It has also been incorporated into bacteriological growth media.

The Merck Index gives the names nuclear fast red and kernechtrot as synonyms for neutral red. These two names are usually applied to another dye, CI 60760, which can be used as a red nuclear stain when mordanted with potassium alum. If a technique calls for nuclear fast red or kernechtrot, it is probably this latter dye to which it refers, not neutral red.

 

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.

Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.

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

 


 

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