Scarlet GN

Scarlet GN
Names
	Systematic IUPAC name Disodium 3-[(2,4-Dimethyl-5-sulfonatophenyl)hydrazinylidene]-4-oxonaphthalene-1-sulfonate
	Other names Crimson 4R; C.I. Food Red 1; Food red 1; FD & C Red no. 4; Hexacol Ponceau SX; Maple Ponceau SX; Ponceau SX; Purple 4R; E125
Identifiers
CAS Number	4548-53-2 (Z) ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	5020702 (Z) ;
ECHA InfoCard	100.019.870
EC Number	221-856-3;
E number	E125 (colours)
PubChem CID	6537642 (Z); 5483118 (E);
UNII	X3W0AM1JLX ;
CompTox Dashboard (EPA)	DTXSID9062938 ;
	InChI InChI=1S/C18H16N2O7S2.2Na/c1-10-8-11(2)17(16(9-10)29(25,26)27)20-19-14-7-6-12-13(18(14)21)4-3-5-15(12)28(22,23)24;;/h3-9,20H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b19-14-;; Key: AQJHOKDCKYSJAS-MHZTUVSFSA-L ;
	SMILES [Na+].Cc3cc(S(=O)(=O)[O-])c(N=Nc2c(O)c1c(cc2)c(S(=O)(=O)[O-])ccc1)c(C)c3.[Na+]; CC1=CC(=C(NN=C2C=CC3=C(C=CC=C3C2=O)S(=O)(=O)O[Na])C(C)=C1)S(=O)(=O)O[Na];
Properties
Chemical formula	C18H14N2Na2O7S2
Molar mass	480.42 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Scarlet GN, or C.I. Food Red 1, Ponceau SX, FD&C Red No. 4, or C.I. 14700 is a red azo dye once used as a food dye. As a food additive, it has the E number E125. It usually used as a disodium salt.

In the United States, it is not permitted for use in food or ingested drugs and may only be used in externally applied drugs and cosmetics.^[1]^[2]^[3] An exception was added in 1965 to allow its use in the coloring of maraschino cherries, which were considered mainly decorative and not a foodstuff.^[4] This exception was repealed in 1976 due to mounting safety concerns. In the European Union, it is not permitted as a food additive.^[5]

References

^ 21 CFR 81.10
^ 21 CFR 81.30
^ 21 CFR 82.304
^ Pavia, Donald L. (2005). Introduction to Organic Laboratory Techniques: A Small Scale Approach (2nd ed.). pp. 387–389. ISBN 0534408338. Retrieved January 25, 2013.
^ Current EU approved additives and their E Numbers, Food Standards Agency

[1] 21 CFR 81.10

[2] 21 CFR 81.30

[3] 21 CFR 82.304

[4] Pavia, Donald L. (2005). Introduction to Organic Laboratory Techniques: A Small Scale Approach (2nd ed.). pp. 387–389. ISBN 0534408338. Retrieved January 25, 2013.

[FSAlist-5] Current EU approved additives and their E Numbers, Food Standards Agency

[1]

[2]

[3]

[4]

[5]

Names

Systematic IUPAC name Disodium 3-[(2,4-Dimethyl-5-sulfonatophenyl)hydrazinylidene]-4-oxonaphthalene-1-sulfonate
Other names Crimson 4R; C.I. Food Red 1; Food red 1; FD & C Red no. 4; Hexacol Ponceau SX; Maple Ponceau SX; Ponceau SX; Purple 4R; E125
Identifiers
CAS Number	4548-53-2 (Z)
3D model (JSmol)	Interactive image Interactive image
ChemSpider	5020702 (Z)
ECHA InfoCard	100.019.870
EC Number	221-856-3
E number	E125 (colours)
PubChem CID	6537642 (Z) 5483118 (E)
UNII	X3W0AM1JLX
CompTox Dashboard (EPA)	DTXSID9062938
InChI InChI=1S/C18H16N2O7S2.2Na/c1-10-8-11(2)17(16(9-10)29(25,26)27)20-19-14-7-6-12-13(18(14)21)4-3-5-15(12)28(22,23)24;;/h3-9,20H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b19-14-;; Key: AQJHOKDCKYSJAS-MHZTUVSFSA-L
SMILES [Na+].Cc3cc(S(=O)(=O)[O-])c(N=Nc2c(O)c1c(cc2)c(S(=O)(=O)[O-])ccc1)c(C)c3.[Na+] CC1=CC(=C(NN=C2C=CC3=C(C=CC=C3C2=O)S(=O)(=O)O[Na])C(C)=C1)S(=O)(=O)O[Na]
Properties
Chemical formula	C₁₈H₁₄N₂Na₂O₇S₂
Molar mass	480.42 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).