Orange GGN

Orange GGN

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Names
Other names 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid, disodium salt
Identifiers
CAS Number	2347-72-0 Y
ChemSpider	20152418 Y
Jmol 3D model	Interactive image
InChI InChI=1S/C16H12N2O7S2.2Na/c19-15-7-4-10-8-13(27(23,24)25)5-6-14(10)16(15)18-17-11-2-1-3-12(9-11)26(20,21)22;;/h1-9,19H,(H,20,21,22)(H,23,24,25);;/q;2*+1/p-2/b18-17+;; Y Key: CECHAJXICNIUQL-QIKYXUGXSA-L Y InChI=1/C16H12N2O7S2.2Na/c19-15-7-4-10-8-13(27(23,24)25)5-6-14(10)16(15)18-17-11-2-1-3-12(9-11)26(20,21)22;;/h1-9,19H,(H,20,21,22)(H,23,24,25);;/q;2*+1/p-2/b18-17+;; Key: CECHAJXICNIUQL-JLAJEUQUBK
SMILES [Na+].[Na+].[O-]S(=O)(=O)c1cccc(c1)/N=N/c2c3ccc(cc3ccc2O)S([O-])(=O)=O
Properties
Chemical formula	C16H10N2Na2O7S2 (disodium salt)
Molar mass	452.369 g/mol
Vapor pressure	{{{value}}}
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

Orange GGN, also known as alpha-naphthol orange, used to be used as a food dye. It is the disodium salt of 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid. In Europe it was denoted by the E Number E111, but has been forbidden for use in foods since 1 January 1978 (EU directive 76/399/EEC). It has never been included in the food additives list of the Codex Alimentarius. As such it is forbidden for food use in general, because toxicological data has shown it is harmful.

The absorption spectrum of Orange GGN and Sunset Yellow is nearly identical in visible and ultraviolet range, but they can be distinguished by their IR spectra.