Green S

Green S

Names
IUPAC name Sodium 4-[(4-dimethylaminophenyl)-(4-dimethylazaniumylidene-1-cyclohexa-2,5-dienylidene)methyl]-3-hydroxynaphthalene-2,7-disulfonate
Other names Food Green S; FD&C Green 4; Acid green 50; Lissamine Green B; Wool Green S; C.I. 44090; E142
Identifiers
CAS Number	3087-16-9
3D model (Jmol)	Interactive image
ChemSpider	82646
ECHA InfoCard	100.019.463
E number	E142 (colours)
PubChem	91525
UNII	9B7E8Y9D0X
InChI InChI=1S/C27H26N2O7S2.Na/c1-28(2)20-9-5-17(6-10-20)25(18-7-11-21(12-8-18)29(3)4)26-23-14-13-22(37(31,32)33)15-19(23)16-24(27(26)30)38(34,35)36;/h5-16H,1-4H3,(H2,31,32,33,34,35,36);/q;+1/p-1 Key: WDPIZEKLJKBSOZ-UHFFFAOYSA-M InChI=1/C27H26N2O7S2.Na/c1-28(2)20-9-5-17(6-10-20)25(18-7-11-21(12-8-18)29(3)4)26-23-14-13-22(37(31,32)33)15-19(23)16-24(27(26)30)38(34,35)36;/h5-16H,1-4H3,(H2,31,32,33,34,35,36);/q;+1/p-1 Key: WDPIZEKLJKBSOZ-REWHXWOFAE
SMILES [Na+].[O-]S(=O)(=O)c1ccc4c(c1)cc(c(O)c4/C(=C2\C=C/C(=[N+](/C)C)/C=C2)c3ccc(N(C)C)cc3)S([O-])(=O)=O
Properties
Chemical formula	C27H25N2NaO7S2
Molar mass	576.62 g/mol
Melting point	210 °C (410 °F; 483 K) (decomposes)[1]
Hazards
R-phrases	R22
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

Green S is a green synthetic coal tar triarylmethane dye with the molecular formula C₂₇H₂₅N₂O₇S₂Na.

As a food dye, it has E number E142. It can be used in mint sauce, desserts, gravy granules, sweets, ice creams, and tinned peas. Green S is prohibited as a food additive in Canada, United States, Japan, and Norway. It is approved for use as a food additive in the EU^[2] and Australia and New Zealand.^[3]

Green S is a vital dye, meaning it can be used to stain living cells. It is used in ophthalmology, among fluorescein and rose bengal, to diagnose various disorders of the eye's surface.

Green S may cause allergic reactions and is one of the colorants that the Hyperactive Children's Support Group recommends to be eliminated from the diet of children.

References

1. http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=TW&language=en&productNumber=B6756&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fsearch%3Finterface%3DAll%26term%3DGreen%2BS%26N%3D0%26mode%3Dmatch%2520partialmax%26focus%3Dproduct%26lang%3Den%26region%3DTW
2. UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
3. Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.

External links

• Eighteenth Report of the Joint FAO/WHO Expert Committee on Food Additives (JECFA), Wld Hlth Org. techn. Rep. Ser., 1974, No. 557. FAO Nutrition Meetings Report Series, 1974, No. 54. Presented in
• http://www.efsa.europa.eu/en/efsajournal/pub/1851
• http://apps.who.int/food-additives-contaminants-jecfa-database/chemical.aspx?chemID=2119
• http://www.fao.org/food/food-safety-quality/scientific-advice/jecfa/jecfa-additives/detail/en/c/107/