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Acid Red 51
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Name

Acid Red 51

 EINECS 240-474-8
CAS No. 568-63-8 Density N/A
PSA 93.40000 LogP 5.49050
Solubility Soluble in water, glycerin and ethanol, insoluble in oil Melting Point N/A
Formula C20H6I4Na2O5 Boiling Point 693.2oC at 760 mmHg
Molecular Weight 856.872 Flash Point 373oC
Transport Information N/A Appearance Red or brown particles or powder
Safety 36-24/25-22 Risk Codes 22
Molecular Structure Molecular Structure of 568-63-8 (Acid Red 51) Hazard Symbols HarmfulXn
Synonyms

C.I. Food Red14;Ceplac;Erythrosin;C Red No. 3-37003;Japan Food Red No. 3;Japan Red 3;Japan Red No. 3;Neelicol Erythrosine;Synerid;C.I. 45430;Food Red 14;Erythrosin B sodium salt;2-(6-Hydroxy-2,4,5,7-tetraiodo-3-oxo-3H-xanthen-9-yl)-benzoic acid disodium salt;Acid Red 5 sodium salt;Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one,3',6'-dihydroxy-2',4',5',7'-tetraiodo-, sodium salt (1:2);

Article Data 1

Acid Red 51 Synthetic route

14701-21-4

silver (I) ion

568-63-8

erythrosin

2Ag(1+)*C20H6I4O5(2-)=Ag2C20H6I4O5

Conditions
ConditionsYield
In water 25°C, constant ionic strength (KNO3), various concns. of dye; no isolation, identification by potentiometric titration of dye soln. by AgNO3;
568-63-8

erythrosin

silver nitrate

2Ag(1+)*C20H6I4O5(2-)=Ag2C20H6I4O5

Conditions
ConditionsYield
In water excess of AgNO3; ppt. washed, dried;

Acid Red 51 Specification

The Acid Red 51, with the CAS registry number 568-63-8, is also known as Erythrosin B sodium salt. Its EINECS number is 240-474-8. This chemical's molecular formula is C20H6I4Na2O5 and molecular weight is 879.86. What's more, its systematic name is Disodium 2-(2,4,5,7-tetraiodo-6-oxido-3-oxo-3H-xanthen-9-yl)benzoate. It has poor lightfastness and good heat, alkali and bacterial resistance, but it is unstable to acid. It is used as a food coloring, in printing inks, as a biological stain, a dental plaque disclosing agent and a radiopaque medium. It was used as a sensitizer for orthochromatic photographic films. It is also commonly used in sweets such as some candies and popsicles, and even more widely used in cake-decorating gels. It is also used to color pistachio shells. As a food additive, it has the E number E127. This chemical has structural similarity to thyroxine. 

Preparation: this chemical can be prepared by iodating fluorescein. Heat and fuse resorcinol, phthalic anhydride and anhydrous zinc chloride, and get crude fluoresce. Refine crude fluoresce with ethanol, and dissolve it in sodium hydroxide solution, then add iodine to react. Add hydrochloric acid to separate crystal, and turn it into sodium salt, and then concentrate the sodium salt.

When you are using this chemical, please be cautious about it as the following:
This chemcial is harmful if swallowed. You should not breathe dust. When using it, you need to wear suitable protective clothing and must avoid contact with eyes.

You can still convert the following datas into molecular structure:
(1)SMILES: c1ccc(c(c1)c2c3cc(c(c(c3oc-4c(c(=O)c(cc24)I)I)I)[O-])I)C(=O)[O-].[Na+].[Na+]
(2)Std. InChI: InChI=1S/C20H8I4O5.2Na/c21-11-5-9-13(7-3-1-2-4-8(7)20(27)28)10-6-12(22)17(26)15(24)19(10)29-18(9)14(23)16(11)25;;/h1-6,25H,(H,27,28);;/q;2*+1/p-2
(3)Std. InChIKey: IINNWAYUJNWZRM-UHFFFAOYSA-L 

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