2005 Volume 19 Pages 147-151
The adsorption amount of artificial sebum on various forms and chemical compositions of hydroxyapatite was measured by gas chromatography analysis (GC). From these results, it has been shown that the adsorption amount of oleic acid was in order of Spherical-HAP>SiO2>FL-HAP (SC)>FL-HAP. The adsorption of artificial sebum is not influenced by shape or particle diameter of hydroxyapatite, and preferential adsorption of oleic acid, which is unsaturated fatty acids in artificial sebum, was clarified. The selectivity of silica as a comparison material was not confirmed. The adsorption amount of oleic acid for each I g of Spherical-HAP was 38mg. It seemed also that the adsorption amount of oleic acid showed tendency to increase with increase in calcium content. As for the adsorption mechanism, the possibility of relation to c-plane (Ca sites) was suggested. Moreover, when the effect of cosmetics that mixed with hydroxyapatite was examined, the adsorption amount of oleic acid was about 1.5 times compared with the control. The prevention of shiny skin and makeup deterioration due to removal of the unsaturated fatty acid by hydroxyapatite is presented in the cosmetics field.
