| Description | 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. |
| Synonyms | Acid Red 18, New Coccine |
| molecular weight | 604.46 |
| Molecular formula | C20H11N2Na3O10S3 |
| CAS | 2611-82-7 |
| Storage | keep away from direct sunlight | Powder: -20°C for 3 years | In solvent: -80°C for 1 year |
| Solubility | H2O: 22.5 mg/mL (37.2 mM), Sonication is recommended. DMSO: 9.0 mg/mL (14.9 mM), Sonication and heating to 60℃ are recommended. |
| References | 1. Rychen G, et al. Safety and efficacy of ponceau 4R for cats, dogs and ornamental fish. EFSA J. 2018;16(3):e05222. 2. Dong Y, et al. Quantification of Ponceau 4R in Foods by Indirect Competitive Enzyme-Linked Immunosorbent Assay (icELISA). J Agric Food Chem. 2015;63(28):6338-6345. |