Adsorption of Dodecyl Sulfate Ion on Hydroxyapatite and Concurrent Release of Phosphate and Calcium Ions from the Surface of Hydroxyapatite

概要

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Concentrations of phosphate ion ([Pi]_f) and calcium ion ([Ca^<2+>]_f) free from the surface of hydroxypatite (Ca_<10>(PO_4)_6(OH)_2; HAP) at the adsorption equilibrium of sodium dodecyl sulfate (SDS) were determined as a function of equilibrium concentration of dodecyl sulfate ion ([DS^-]_f). When [DS^-]_f was lower than its critical micelle concentration (cmc), [Pi]_f increased with increase in [DS^-]_f owing mainly to the ion-exchange between dodecyl sulfate ion (DS^-) and surface phosphate ion. However, [Ca^<2+>]_f decreased with increase in [Pi]_f to maintain the solubility product of HAP constant. On the other hand, when [DS^-]_f was higher than the cmc, [Ca^2+]_f increased with increase in [DS^-]_f due to the binding of Ca^<2+> to DS^- micelles. Anionic species were concomitantly liberated from the surface of HAP to maintain the electroneutrality of the surface phase. Therefore, [Pi]_f increased and the amount of adsorption of DS^- decreased with increase in [DS^-]_f.
社団法人日本薬学会の論文
1986-11-25