Green S

Chemical compound and dye
Green S
Skeletal formula of Green S
Ball-and-stick model of Green S as a sodium salt
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 checkY
3D model (JSmol)
  • Interactive image
ChemSpider
  • 82646 checkY
ECHA InfoCard 100.019.463 Edit this at Wikidata
E number E142 (colours)
PubChem CID
  • 91525
UNII
  • 9B7E8Y9D0X ☒N
CompTox Dashboard (EPA)
  • DTXSID4046577 Edit this at Wikidata
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 checkY
    Key: WDPIZEKLJKBSOZ-UHFFFAOYSA-M checkY
  • 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
  • [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
GHS labelling:[2]
Pictograms
GHS07: Exclamation mark
Warning
Hazard statements
H302, H315, H319, H335
Precautionary statements
P261, P305+P351+P338
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
Chemical compound

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.[3] It is approved for use as a food additive in the EU[4] and Australia and New Zealand.[5]

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

References

  1. ^ "Safety Data Sheet for Green S". Sigma-Aldrich.
  2. ^ Sigma-Aldrich Co., Green B. Retrieved on 2019-06-09.
  3. ^ "Green S". Ataman Chemicals. Retrieved 5 May 2024.
  4. ^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  5. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". 8 September 2011. 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.
  • 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/