Maintaining Fragrant Hair after Shampooing

Haraya Nana, Yamato Naoya, Oshimura Eiko

doi:10.5107/sccj.56.290

<p>The complex coacervation of an anionic surfactant with a cationic polymer is one of the most important formulation techniques for modern conditioning shampoos. This study investigated the amount of perfume retained by hair following shampooing in relation to the complex coacervate-forming abilities of various anionic surfactants, including cocoyl glutamate (CG) with a cationic hydroxyethyl cellulose (PQ10). d-Limonene, a commonly used fragrance, was included in our shampoo formulations. We examined anionic surfactant-PQ10 complex coacervates by diluting several model shampoos, which revealed that complex coacervates facilitate the retention of d-Limonene on hair. In particular, a shampoo containing CG and PQ10 exhibited high levels of CG-PQ10 complex coacervate; the shampooed hair retained a remarkable amount of limonene compared to other shampoos containing anionic surfactants, such as alkyl ether sulfates or acylsarcosinate, together with PQ10. The amount of d-Limonene retained on hair using the CG-PQ10 shampoo was found to be controlled by its salt and fatty acid concentrations, as well as the pH of the formulation. CG is a mild anionic surfactant that can be used in the skin-compatible pH range and is known to be highly biodegradable and environmentally friendly. Given the ability of CG to coacervate with cationic polymers over a wide range of CG concentrations in diluted shampoo, our results indicate that CG is a useful material for engendering shampoos with additional value.</p>

Maintaining Fragrant Hair after Shampooing

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