Green S

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Green S
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Names
IUPAC name
Sodium 4-[(4-dimethylaminophenyl)-(4-dimethylazaniumylidene-1-cyclohexa-2,5-dienylidene)methyl]-3-hydroxynaphthalene-2,7-disulfonate
Other names
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  • Food green S
  • FD&C green 4
  • acid green 50
  • lissamine green B
  • wool green S
  • C.I. 44090
  • E142
Identifiers
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3D model (JSmol)
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  • 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
C27H25N2NaO7S2
Molar mass 576.62 g/mol
Melting point 210 °C (410 °F; 483 K) (decomposes)[1]
Hazards
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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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.[citation needed][why?]

References

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  1. ^ Page Module:Citation/CS1/styles.css has no content."Safety Data Sheet for Green S". Sigma-Aldrich.
  2. ^ Sigma-Aldrich Co., Green B. Retrieved on 2019-06-09.
  3. ^ Page Module:Citation/CS1/styles.css has no content."Green S". Ataman Chemicals. Retrieved 5 May 2024.
  4. ^ UK Food Standards Agency: Page Module:Citation/CS1/styles.css has no content."Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  5. ^ Australia New Zealand Food Standards CodePage Module:Citation/CS1/styles.css has no content."Standard 1.2.4 - Labelling of ingredients". 8 September 2011. Retrieved 2011-10-27.
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