Adsorption of Dodecylammonium Ion on Hydroxyapatite and Concurrent Release of Phosphate and Calcium Ions from the Surface of Hydroxyapatite(Physical,Chemical)
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概要
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Concentrations of phosphate ion ([Pi]_t) and calcium ion ([Ca^<2+>]_r), liberated from the surface of synthetic hydroxyapatite (Ca_<10>(PO_4)_6(OH)_2; HAP) during the adsorption of dodecylammonium chloride (DAC), were determined as a function of equilibrium concentration of dodecyla(Organic,Chemical)mmonium ion ([DA^+]_r). When [DA^+]_r was lower than its critical micelle concentration (cmc), [Ca^<2+>]_r increased with increase in [DA^+]_r owing mainly to ion-exchange between dodecylammonium ion (DA^+) and calcium ion (Ca^<2+>) on the surface of HAP. However, [Pi]_r decreased with increase in [Ca^<2+>]_r to keep the solubility product for HAP (K_<ND>) constant. On the other hand, when [DA^+]_r was higher than the cmc, [Pi]_r increased with increase in [DA^+]_r due to the binding of phosphate ion (Pi) to DA^+ micelles. Cationic species (i.e., Ca^<2+> and DA^+) were concomitantly liberated from the surface of HAP to maintain the electroneutrality of the surface phase. Therefore, [Ca^<2+>]_r increased and the adsorbed amount of DA^+ (X_<DA^4>) decreased with increase in [DA^+]_r. When CaCl_2 was added to the solution, X_<DA^+> decreased with increasing concentration of added CaCl_2 owing to the competitive adsorption between DA^+ and added Ca〜<2+>. The release of Pi was strongly depressed because of the electrostatic interaction between surface Pi and adsorbed Ca^<2+>, and because of the requirement of constant K_<sp> in the bulk solution.
- 公益社団法人日本薬学会の論文
- 1987-09-25
著者
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SHIMABAYASHI Saburo
Faculty of Pharmaceutical Sciences, The University of Tokushima
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TANAKA Hideji
Faculty of Pharmaceutical Sciences, The University of Tokushima
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Shimabayashi Saburo
Faculty Of Pharmaceutical Sciences Kyoto University
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Tanaka H
Department Of Food Science And Technology Faculty Of Agriculture Kyoto University
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NAKAGAKI MASAYUKI
Faculty of Pharmaceutical Sciences, Kyoto University
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Nakagaki Masayuki
Faculty Of Pharmaceutical Sciences Kyoto University
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Tanaka Hideji
Faculty Of Pharmaceutical Sciences Kyoto University
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Nakagaki Masayuki
Faculty of Living Science Osaka City University
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