Amphiphilic association structures in a model skin lotion with hydroxy acids

The phase diagrams were determined of lactic and isohexanoic hydroxy acids as well as salicylic acid with water, a non‐ionic surfactant and a paraffinic oil to outline the influence of the hydroxy acids on the structure in a model for a skin lotion. The results showed the influence of the acid to be similar to that of the oil, but that the difference in chain length between the two alpha acids had only insignificant influence. The results are discussed from two aspects: the structures involved in the lotion as applied and the action of the lotion residue on the skin after the evaporation of the water.

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