Abstract
Titanium dioxide (TiO 2) sol (TS) or TiO 2 nanoparticles with chitosan shell were encapsulated to enhance their sun protection abilities. Nanocapsules loaded with TiO 2 were evaluated for their ultraviolet (UV) absorption and UV protection rate. The effect of eicosapentaenoic acid (EPA) incorporation into the nanocapsules was examined in relation to UV absorption. The particle size of TiO 2 crystallites in TS was below 30 nm, which was considerably smaller than that of a commercial TiO 2 (P25 TiO 2) particles. In the encapsulation of TiO 2 with chitosan, the loading efficiencies of TS were higher than those of P25 TiO 2. The sizes of the nanocapsules loaded with TiO 2 particles ranged from 30 to 80 nm. The absorption range of irradiation wavelength was enlarged by the incorporation of EPA into the nanocapsules. The TS-loaded nanocapsules exhibited a high UV protection rate of up to 95% to both UV-A and UV-B.
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