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| Catalog Number | CI-GU-0151 |
| Product Name | Benzophenone-9 |
| CAS | 76656-36-5 |
| Structure |  |
| Synonyms | Disodium 2,2'-dihydroxy-4,4'-dimethoxy-5,5'-disulfobenzophenone |
| IUPAC Name | disodium;4-hydroxy-5-(2-hydroxy-4-methoxy-5-sulfonatobenzoyl)-2-methoxybenzenesulfonate |
| Molecular Weight | 478.36 g/mol |
| Molecular Formula | C15H12Na2O11S2 |
| InChI | InChI=1S/C15H14O11S2.2Na/c1-25-11-5-9(16)7(3-13(11)27(19,20)21)15(18)8-4-14(28(22,23)24)12(26-2)6-10(8)17;;/h3-6,16-17H,1-2H3,(H,19,20,21)(H,22,23,24);;/q;2*+1/p-2 |
| InChI Key | QDCHWIWENYCPIL-UHFFFAOYSA-L |
| Melting Point | 350 °C |
| Purity | 95% |
| Appearance | Solid |
| Highest Usage In Residency Products | 0.001 |
| Isomeric SMILES | COC1=C(C=C(C(=C1)O)C(=O)C2=CC(=C(C=C2O)OC)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+] |
Benzophenone-9, or 2,2'-Dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disodium sulfonate, is a benzophenone derivative commonly utilized as a UV absorber and stabilizer in cosmetic formulations such as lotions, creams, and hair sun care products. Presented as a yellow crystalline powder, it is water-soluble and particularly suitable for aqueous formulations, providing protection to active ingredients, unstable pigments, and fragrances against UV-induced degradation, especially in transparent packaging. Benzophenone-9 effectively absorbs both UVA and UVB rays, thereby maintaining the color integrity of various formulations and is compatible with a wide range of pigments. While not recognized as an FDA Category I sunscreen active and therefore not applicable for over-the-counter sun care applications, when used as directed, Benzophenone-9 does not present any indicated risk of toxicity.
What is Benzophenone-9 and in what form is it commonly available?
Benzophenone-9 is a benzophenone derivative known chemically as 2,2'-Dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disodium sulfonate. It commonly presents as a yellow crystalline powder and serves as a UV absorber and stabilizer.
In which types of products is Benzophenone-9 typically used?
Benzophenone-9 is commonly used in lotions, creams, and hair sun care applications. It is particularly beneficial for protecting active ingredients, unstable pigments, and fragrances from UV-induced decomposition, making it ideal for use in transparent packaging.
Is Benzophenone-9 suitable for all sunscreen applications?
No, Benzophenone-9 is not an FDA Category I sunscreen active ingredient and therefore cannot be utilized for over-the-counter sun care applications. However, it is effective as a UVA and UVB absorber to protect the color of various formulations.
Can Benzophenone-9 be used in aqueous formulations?
Yes, Benzophenone-9 is soluble in water, making it suitable for use in aqueous formulations.
Are there any known risks associated with the use of Benzophenone-9?
The available information indicates that there is no risk of toxicity associated with Benzophenone-9 as long as it is used within the recommended applications and concentrations.
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