Evaluation of oil adsorption ability and light reflection properties of spherical porous hydroxyapatite

Abstract

Spherical porous hydroxyapatite was synthesized by a wet method using a simulated body fluid. The grain size is about 1 - 5 μm, the center part is dense, but there are plate - like crystals of about 0.1 - 0.5 μm overlapping on the surface, and there is a gap of about 0.4 μm at the maximum therebetween . We evaluated the oil adsorption ability and light reflection properties of spherical porous hydroxyapatite and investigated further possibilities of application as pharmaceuticals and cosmetics. When tri (caprylic / capric acid) glyceryl, sugar squalane and oleic acid were investigated, the adsorption amount of fat was almost the same as that of commercially available apatite. It is thought that oils are held mainly in the gaps of plate crystals. Light reflection in the near infrared region is about 60% higher than that of particulate apatite produced by the same manufacturing method, and it can be expected to be applied as biomaterials and cosmetic materials for protecting the skin from near infrared rays. Furthermore, since spherical porous hydroxyapatite can also carry functional particles in gaps or the like of plate crystals, further possibility is suggested as a multifunctional material.