Synthetic Condition for Calcium Phytate to Obtain Hydroxyapatite Powdert

Abstract

A hydroxyapatite (HAp) has been synthesized using phytin as a P-source. Phytin is contained in rice bran which can be extracted by acid or alkali from oil-less rice bran. Here phytin was extracted from 10 g of oil-less rice bran by a HC1 solution (0.01 mol⋅dm^-3100 ml) at 60°C for 1 h. The cations of Fe⁸⁺, Mg²⁺, K⁺ etc. in solution were removed by passing the solution through a column of cation-exchange resin. The mixtures of CaCO₃(0.7 g) and Ca(OH)₂(0.3 g) were added to the extract of 200 ml containing phytin and stirred at 60°C for 1 h. to obtain the precipitate of calcium phytate. The precipitates were washed, dried, and finally fired at 1000°C for 3 h. to obtain HAp powders. The formation process of calcium phytate were observed with SEM. While the shape of calcium phytate obtained was spherical particles of 0.2-0.5μm in diameter. The atomic ratio Ca/P of HAp powder obtained was 1.67.