Orange GGN

Orange GGN, also known as alpha-naphthol orange, is an azo dye[1] formerly 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.[2] 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.

Orange GGN

Names
Other names 1-(m-Sulfophenylazo)-2-naphthol-6-sulfonic acid, disodium salt
Identifiers
CAS Number	2347-72-0
3D model (JSmol)	Interactive image
ChemSpider	20152418
ECHA InfoCard	100.017.340
E number	E111 (colours)
PubChem CID	16868
UNII	35HF83708U
CompTox Dashboard (EPA)	DTXSID90893685
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+;; Key: CECHAJXICNIUQL-QIKYXUGXSA-L 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
Molar mass	452.36 g·mol^−1
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

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.

References

1. "Orange GGN".
2. EU directive 76/399/EEC