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Concentrations of phosphate ion ([Pi] f) and calcium ion ([Ca2+] f), liberated from the surface of synthetic hydroxyapatite (Ca10 (PO) 4) 6 (OH) 2; HAP) during the adsorption of cetylpyridinium ion (CP+) or cetyltrimethylammonium ion (CTA+), were determined as a function of the equilibrium concentrations of these surface active ions ([CP+] f or [CTA+] f). A part of CP+ or CTA+ was adsorbed by ion-exchange with calcium ion (Ca2+) on the surface of HAP, and the rest was adsorbed together with its counterion (Cl- or Br-). In the region below the critical micelle concentration (cmc), [Ca2+]f increased with an increase in the adsorbed amount of the surface active ion. On the other hand, [Pi] f decreased with an increase in [Ca2+] f to keep the solubility product of HAP (Ksp) constant. However, in the region above the cmc, [Pi] f increased with [CP+] f or [CTA+] f through the binding of phosphate ion (Pi) to the cationic micelles. The electroneutrality on the surface phase of HAP, the solubility product of HAP in the solution phase, and the counterion binding by micelles determined the relationship between [Pi] f and [Ca2+] f. The species of counterion of the surfactant (Cl- or Br-) affected the adsorbing and releasing behaviors : the release of Ca2+ due to the adsorption of CP+ and the release of Pi through its binding to CP+-micelles are more pronounced with cetylpyridinium chloride than with cetylpyridinium bromide. This result can be explained in terms of the affinity of the halide ion for CP+ in the micellar and adsorbed phases (Br->Cl-).

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Adsorption of cetylpyridinium and cetyltrimethylammonium ions on hydroxyapatite and concurrent release of phosphate and calcium ions from the surface of hydroxyapatite.