In this study, calcium nitrate, Ca(NO3)24H2O (99.9% purity,
Kanto Chemical), diammonium hydrogen phosphate, (NH4)2HPO4
(99% purity, BDH) and aloe vera plant extract were used as the
starting materials. The molar ration of Ca/P was kept at 1.67 as
HAp. Aloe vera extracted solution was prepared from a 35 g por-
tion of thoroughly washed aloe vera leaves which were finely cut
and boiled in 100 ml of de-ionized water. The resulting extract
was used as an aloe vera extract solution. The starting materials
were added slowly to 250 ml of the aloe vera extracted solution
under vigorous stir at 30 C to obtain a well dissolved solution.
Throughout the whole process described above, no pH adjustment
was made. Then, the mixed solution was continuously stirred at
150 C until dried precursor was obtained. In order to determine