Orange GGN

Orange GGN

Other names 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid, disodium salt
Identifiers
CAS number	2347-72-0^Y
ChemSpider	20152418^Y
Jmol-3D images	Image 1
SMILES [Na+].[Na+].[O-]S(=O)(=O)c1cccc(c1)/N=N/c2c3ccc(cc3ccc2O)S([O-])(=O)=O
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
Properties
Molecular formula	C₁₆H₁₀N₂Na₂O₇S₂ (disodium salt)
Molar mass	452.369 g/mol
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Orange GGN, also known as alpha-naphthol orange, was previously afood dye. It is the disodium salt of 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid. In Europe it was previously denoted by the E Number E111 previously, 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 allimentarius. As such it is presently 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.