Sudan IV

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
Sudan IV
Sudan IV
Scarlet R or red
Scharlach R
Biebrich scarlet R
26105
Solvent red 24
Azo
Lysochrome
Insoluble
0.09%
522-529 (Conn)
513-515 (Gurr)
520, 357 (Aldrich)
Red
C24H20N4O
380.5

Sudan IV is a lysochrome (fat soluble dye) predominantly used for demonstrating triglycerides in frozen sections, but which may also stain some protein bound lipids in paraffin sections. It is less popular than oil red O as it has a more orange shade.

Compare this dye to the other common lysochromes sudan III, oil red O and sudan black B.

Gurr notes that a purified form of this dye has the name "Biebrich scarlet R". It should not be confused with the water soluble dye which is much more commonly referred to as Biebrich scarlet. This latter dye is not a lysochrome, but is used as a plasma stain in trichrome techniques.

 

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

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

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

 


 

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