Sudan II

Sudan II
Names
IUPAC name
1-(2,4-Dimethylphenylazo)-2-naphthol
Other names
see text
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.019.537 Edit this at Wikidata
KEGG
UNII
  • InChI=1S/C18H16N2O/c1-12-7-9-16(13(2)11-12)19-20-18-15-6-4-3-5-14(15)8-10-17(18)21/h3-11,21H,1-2H3/b20-19+ checkY
    Key: JBTHDAVBDKKSRW-FMQUCBEESA-N checkY
  • InChI=1/C18H16N2O/c1-12-7-9-16(13(2)11-12)19-20-18-15-6-4-3-5-14(15)8-10-17(18)21/h3-11,21H,1-2H3/b20-19+
    Key: JBTHDAVBDKKSRW-FMQUCBEEBZ
  • Cc3ccc(/N=N/c1c2ccccc2ccc1O)c(C)c3
Properties
C18H16N2O
Molar mass 276.339 g·mol−1
Melting point 156 to 158 °C (313 to 316 °F; 429 to 431 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sudan II (Solvent Orange 7, C.I. 12140, C18H16N2O)[1] is a lysochrome (fat-soluble dye) azo dye used for staining of triglycerides in frozen sections, and some protein bound lipids and lipoproteins on paraffin sections. It has the appearance of red powder with melting point 156–158 °C and maximum absorption at 493(420) nm.[1]

Uses

In industry, it is used to color nonpolar substances like oils, fats, waxes, greases, various hydrocarbon products, and acrylic emulsions.[2]

It was used as food dye under the designation FD&C Red 32 in the US until the FDA banned its use in food in 1956 due to toxicity.[3]

References

  1. ^ a b "Substance Name: C.I. Solvent Orange 7". ChemIDplus, Toxnet Database. Retrieved 15 October 2016.
  2. ^ "HSDB: C.I. Solvent Orange 7. CASRN: 3118-97-6". Toxnet. Retrieved 15 October 2016.[dead link‍]
  3. ^ Deshpande, S.S., ed. (2002), "8.5.3 Toxicological Characteristics of Colorants Subject to Certification", Handbook of Food Toxicology, Food Science and Technology, CRC Press, p. 234, ISBN 9780824707606