Sudan Ii

Sudan II
Names
	IUPAC name 1-(2,4-Dimethylphenylazo)-2-naphthol
	Other names see text
Identifiers
CAS Number	3118-97-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	13621577 ;
KEGG	C19526 ;
PubChem CID	18386;
UNII	8C1M5O3ECT ;
	InChI 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+ Key: JBTHDAVBDKKSRW-FMQUCBEESA-N ; 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;
	SMILES Cc3ccc(/N=N/c1c2ccccc2ccc1O)c(C)c3;
Properties
Chemical formula	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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	Infobox references

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

↑ ^1.0 ^1.1 "Substance Name: C.I. Solvent Orange 7". ChemIDplus, Toxnet Database. https://chem.nlm.nih.gov/chemidplus/rn/3118-97-6. Retrieved 15 October 2016.
↑ "HSDB: C.I. Solvent Orange 7. CASRN: 3118-97-6". Toxnet. https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@DOCNO+6365. Retrieved 15 October 2016. ^{[|permanent dead link|dead link}}]}
↑ 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, https://books.google.com/books?id=Mk-IdNTTJB0C&pg=PA234

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Original source: https://en.wikipedia.org/wiki/Sudan II. Read more

[ChemIDplus-1] 1.0 ^1.1 "Substance Name: C.I. Solvent Orange 7". ChemIDplus, Toxnet Database. https://chem.nlm.nih.gov/chemidplus/rn/3118-97-6. Retrieved 15 October 2016.

[2] "HSDB: C.I. Solvent Orange 7. CASRN: 3118-97-6". Toxnet. https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@DOCNO+6365. Retrieved 15 October 2016. ^{[|permanent dead link|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, https://books.google.com/books?id=Mk-IdNTTJB0C&pg=PA234

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v t e Microbial and histological stains
Iron/hemosiderin	Perls' Prussian blue
Lipids	Sudan stain Sudan II Sudan III Sudan IV Oil Red O Sudan Black B
Carbohydrates	Periodic acid–Schiff stain
Amyloid	Congo red
Bacteria	Gram stain Methyl violet/Gentian violet Safranin Ziehl–Neelsen stain/acid-fast Carbol fuchsin/Fuchsine Methylene blue Auramine–rhodamine stain Auramine O Rhodamine B
Connective tissue	trichrome stain: Masson's trichrome stain/Lillie's trichrome Light Green SF yellowish Biebrich scarlet Phosphomolybdic acid Fast Green FCF Van Gieson's stain
Other	Alcian blue stain Cyanine Jaswant Singh–Bhattacharji (JSB) stain H&E stain Haematoxylin Eosin Y Janus Green B Giemsa stain Gömöri trichrome stain Luxol fast blue stain Methyl blue Movat's stain Neutral red Silver stain Bielschowsky stain Grocott's methenamine silver stain Warthin–Starry stain Wright's stain
Tissue stainability	Acidophilic Basophilic Chromophobic