Red 2G

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Structural formula
Structure of the red 2G
General
Surname Red 2G
other names
  • Disodium 5-acetamido-4-hydroxy-3 - [( E ) -phenyldiazenyl] -2,7-naphthalene disulfonate ( IUPAC )
  • CI Acid Red 1
  • CI 18050
  • Amidonaphthol Red G
  • Azophloxin
  • Phloxin G.
  • E 128
Molecular formula C 18 H 13 N 3 Na 2 O 8 S 2
Brief description

dark red solid

External identifiers / databases
CAS number
  • 3734-67-6
  • 25317-20-8 (free acid)
EC number 223-098-9
ECHA InfoCard 100.020.999
PubChem 19522
ChemSpider 20152427
Wikidata Q417819
properties
Molar mass 509.42 g mol −1
Physical state

firmly

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Red 2G is a blue-red azo dye from the group of acid dyes .

presentation

Red 2G can be synthesized by azo coupling of diazotized aniline with N - acetylated H acid .

properties

Red 2G forms red crystals with absorption maxima at λ = 506 nm and λ = 532 nm.

Use and approval

The dye was approved in the EU as a food dye under the number E 128. In Ireland and Great Britain in particular , it was used to color breakfast sausages and minced meat with a portion of grain . Due to the carcinogenic effects of aniline, which has been proven in animal experiments and which can form in the body when red 2G is broken down under reductive conditions, the safety of the dye was reassessed by the EFSA in 2007 and the approval of red 2G as a food color was revoked by the European Commission . The Irish government had already anticipated the EU-wide ban.

In Switzerland, Rot 2G was approved for minced meat with a vegetable content of over 4% until March 2008.

The dye is approved for cosmetics that are not intended to come into contact with mucous membranes .

Individual evidence

  1. ↑ a b c data sheet Red 2G from Sigma-Aldrich , accessed on May 15, 2017 ( PDF ).
  2. ↑ External identifiers or database links for Acid Red 1, free acid : CAS number: 25317-20-8, EC number: 246-823-0, ECHA InfoCard: 100.042.552 , PubChem : 19523 , ChemSpider : 14731274 , Wikidata : Q27276715 .
  3. ↑ European Food Safety Authority: Red 2G (2007)
  4. ↑ Official Journal of the EU: Regulation on Red 2G (2007) (PDF; 42 kB).