Sudan Iii

Sudan III

Names
Preferred IUPAC name 1-{[4-(Phenyldiazenyl)phenyl]diazenyl}naphthalen-2-ol
Other names Sudan Red BK, Fat Ponceau G, Cerasin Red, C.I. 26100, Solvent Red 23, Solvent Red 164, Sudan Red, Sudan Red III, Sudan V, Sudan Red B, Sudan G, Scarlet B, and Tony Red
Identifiers
CAS Number	85-86-9 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:82535 Y
ChEMBL	ChEMBL2001927
ChemSpider	16736189 Y
KEGG	C19527 Y
PubChem CID	62331
UNII	ND733RX3JN Y
InChI InChI=1S/C22H16N4O/c27-21-15-10-16-6-4-5-9-20(16)22(21)26-25-19-13-11-18(12-14-19)24-23-17-7-2-1-3-8-17/h1-15,27H/b24-23-,26-25+ Y Key: FHNINJWBTRXEBC-HXEHWPEMSA-N Y InChI=1/C22H16N4O/c27-21-15-10-16-6-4-5-9-20(16)22(21)26-25-19-13-11-18(12-14-19)24-23-17-7-2-1-3-8-17/h1-15,27H/b24-23-,26-25+ Key: FHNINJWBTRXEBC-HXEHWPEMBU
SMILES Oc4ccc1ccccc1c4/N=N/c3ccc(\N=N/c2ccccc2)cc3
Properties
Chemical formula	C22H16N4O
Molar mass	352.397 g·mol−1
Melting point	199 °C (390 °F; 472 K)
Hazards[1]
Safety data sheet	Sigma-Aldrich Sudan III
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H315, H318, H319, H335, H413
GHS precautionary statements	P101, P102, P103, P270, P261, P264, P271, P273, P280, P302+352, P304+340, P305+351+338, P310, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Sudan III is a lysochrome (fat-soluble dye) diazo dye. It is structurally related to azobenzene.^[2]

Uses

It is used to color nonpolar substances such as oils, fats, waxes, greases, various hydrocarbon products, and acrylic emulsions. Its main use is as a fuel dye in the United States of America mandated by the Internal Revenue Service (IRS) to distinguish low-taxed heating oil from automotive diesel fuel, and by the United States Environmental Protection Agency (EPA) to mark fuels with higher sulfur content; it is a replacement for Solvent Red 26 with better solubility in hydrocarbons.^[3] The IRS requires "a concentration spectrally equivalent to at least 3.9 pounds of... Solvent Red 26 per thousand barrels of fuel" (11.1 mg/L);^[4] the concentrations required by EPA are roughly 5 times lower. It should be stored at room temperature.^[5]

Biological staining

Sudan III is a dye used for Sudan staining. Similar dyes include Oil Red O, Sudan IV, and Sudan Black B. They are used for staining of triglycerides in frozen sections, and some protein bound lipids and lipoproteins on paraffin sections. It has the appearance of reddish brown crystals and a maximum absorption at 507(304) nm.^[6] It has a more orange shade than Oil Red O, lending to its less popular status. In botany, it is used with Light Green SF Yellowish to differentiate between suberized and cutinized plant tissue.^[5]

Safety

Sudan I, Sudan III, and Sudan IV have been classified as category 3 carcinogens by the International Agency for Research on Cancer.^[7]

References

• Susan Budavari, Editor, (1996). The Merck Index, Ed. 12. Merck & Co., Inc., Whitehouse Station, NJ, USA
• Edward Gurr, (1971). Synthetic Dyes in Biology, Medicine and Chemistry. Academic Press, London, England.

External links

• Stains File entry

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