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Merck
CN

40462

Red 2G

analytical standard

Synonym(s):

Acid Red 1, Amido Naphthol Red G, Azophloxine

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About This Item

Empirical Formula (Hill Notation):
C18H13N3Na2O8S2
CAS Number:
3734-67-6
Molecular Weight:
509.42
NACRES:
NA.24
E Number:
E128
PubChem Substance ID:
329755991
UNSPSC Code:
85151701
EC Number:
223-098-9
MDL number:
MFCD00003954
Beilstein/REAXYS Number:
4121767

Key Documents

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Product Name

Red 2G, analytical standard

InChI

1S/C18H15N3O8S2.2Na/c1-10(22)19-14-9-13(30(24,25)26)7-11-8-15(31(27,28)29)17(18(23)16(11)14)21-20-12-5-3-2-4-6-12;;/h2-9,23H,1H3,(H,19,22)(H,24,25,26)(H,27,28,29);;/q;2*+1/p-2/b21-20+;;

InChI key

WXLFIFHRGFOVCD-SERMZQFOSA-L

SMILES string

[Na+].[Na+].CC(=O)Nc1cc(cc2cc(c(\N=N\c3ccccc3)c(O)c12)S([O-])(=O)=O)S([O-])(=O)=O

grade

analytical standard

assay

≥98.0% (HPLC)

technique(s)

HPLC: suitable
gas chromatography (GC): suitable

application(s)

cleaning products
cosmetics
food and beverages
personal care

format

neat

Quality Level

100

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Application

Red 2G may be used as an analytical reference standard for the quantification of the analyte in:
  • Drinks and candies using reversed-phase high-performance liquid chromatography with photodiode array detection (RP-HPLC-PDA).
  • Food products, beverages and water-soluble foods using reversed-phase high-performance liquid chromatography with diode array detection (RP-HPLC-DAD).

Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.

General description

Red 2G (E-128) is used for the quality control in food products. It belongs to the class of water-soluble synthetically prepared, food color additives, reportedly banned by the European and United states union. These synthetic food colors are commonly used to compensate for the loss of natural colors of food, destroyed during processing and storage. They also maintain and improve the color appearance in food products. E-128 is a mono azo dye, reported to cause increased iron deposition in the human kidney. It finds applications as a color additive in burger meat and sausages.
Red 2G is a compound, which belongs to the azo family of dyes, generally used in textile industry.It can mainly find applications in non-linear optical studies.

Packaging

Bottomless glass bottle. Contents are inside inserted fused cone.

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
BCCM5881
BCCM2603
BCCG5227

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Determination of 18 water-soluble artificial dyes by LC?MS in selected matrices
Martin F, et al.
Food Chemistry, 197, 1249-1255 (2016)
An analysis of the possibility for health implications of joint actions and interactions between food additives
Groten PJ, et al.
Regulatory Toxicology and Pharmacology, 31(1), 77-91 (2000)
Food Analysis by HPLC (2012)
Determination of 13 synthetic food colorants in water-soluble foods by reversed-phase high-performance liquid chromatography coupled with diode-array detector
Minioti SK, et al.
Analytica Chimica Acta, 583(1), 103-110 (2007)
The effect of high-energy radiation on aqueous solution of Acid Red 1 textile dye
Foldvary.M.Cs and Wojnarovits.L
Radiation Physics and Chemistry, 76(8), 1485- 1488 (2007)
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