Effect of the Ultraviolet Protection according to the Concentration of Hydroxyapatite

Sunblocks are materials used in creams to help limit exposure to UVA and UVB.Many sunscreens contain TiO 2 and ZnO as the primary sunblock materials.In this study, we manufactured a sunscreen lotion using hydroxyapatite (HAp) nano-sol instead of ZnO and TiO 2 .HAp is a biomaterial widely used in applications such as bone grafting, so it is known to be very biocompatible.In the present work, HAp-water nano sol, ZnO-water nano sol, and TiO 2 -water nano sol were prepared by the attrition milling method.The sunscreen lotion base (LB) was manufactured with some oil and water.Lotions with various HAp-water solutions and LB concentrations were fabricated and their UV absorbance was measured.6 % HAp content was the optimal amount considering price.The sun protection factor (SPF) value at that level was approximately 20 on average, corresponding to about 95 % UV protection.Results confirmed that ultraviolet screening agents using HAp had an excellent ultraviolet blocking effect.