抄録
Effect of partially phosphorylated cellulose(Phos. Cell.) on the transformation of amorphous calcium phosphate(ACP) to hydroxyapatite(HAP) in an aqueous phase was studied. Small amount of Phos. Cell. accelerated the transformation by virtue of the thick and dense clusters of calcium phosphates formed around the Phos. Cell. The clusters played a role of the heterogeneous nucleation sites for HAP. On the other hand, much amount of Phos. Cell. retarded the transformation. This effect was explained mainly in terms of the consumption of Ca2+(i. e., decrease in its activity) by the adsorption, where Ca2+ was separately bound to phosphate groups of Phos. Cell. The extent of the cluster in this case was small and, therefore, the cluster was less available for the HAP crystal seed.
