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Overview
Ponceau 4R (Acid Red 18) is a synthetic strawberry red azo dye that is a food colorant dye used in a variety of food products. It is stable to light, heat and acid, but fades in the presence of ascorbic acid. It is usually synthesized from aromatic hydrocarbons.
Chemical Properties
| Molecular Formula | C20H11N2Na3O10S3 |
| Molecular Weight | 604.46 |
| CAS Numbers | 2611-82-7 |
| Solubility | DMSO |
| Purity | 98% by HPLC |
| SMILES Code | O=S([O-])(C1=CC2=CC=C(C(N=NC3=CC=C(S(=O)([O-])=O)C4=C3C=CC=C4)=C2C(S(=O)([O-])=O)=C1)O)=O.[Na+].[Na+].[Na+] |
Storage and Handling
0C Short Term, -20C Long Term
References
Rychen G, et al. Safety and efficacy of ponceau 4R for cats, dogs and ornamental fish. EFSA J. 2018;16[3] e05222.