ヒドロキシアパタイトに対するシュウ酸イオンの吸着とその吸着量におよぼす添加物の影響
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概要
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Adsorption of oxalate ion (Ox^<2->) in aqueous solutions (30℃, pH 7.5-12.0) to hydroxyapatite (HAP) was confimed to be reversible and of Langmuir type. The amount (x_<Ox>) of adsorbed Ox^<2-> from Na_2Ox was larger than that from K_2Ox through the size effect of the counter ion. As the thermodynamic activity (ionic activity product) of adsorbate (Na_2Ox or K_2Ox) increases with an increase in concentration of the counter ion, x_<Ox> increased with an increase in the amount of added NaCl or KCl. But the amount of adsorption, x_<Ox>, increased with a decrease in pH because of competitive adsorption with OH^-. It was also suggested that Ox^<2-> competes with Cl^- for the adsorption sites on HAP. Therefore, the amount of adsorption, x_<Ox>, increased apparently by the addition of L-lysine HCl or glycine, but it was concluded that the increase was due to the decrease of pH and these substances do not affect x_<Ox> after pH-correction. On the other hand, x_<Ox> was decreased by the addition of Na_2HPO_4,NaHCO_3 or sodium L-aspartate even after pH-correction owing to the competitive adsorption between Ox^<2-> and these anions. It was concluded that Ox^<2-> is adsorbed to HAP by electrostatic force and that some portion of adsorbed Ox^<2-> is subjected to the ion-exchange with orthophosphate ion on the HAP surface. Some properties of renal calculus formation was explained on the basis of the results presented here.
- 公益社団法人日本薬学会の論文
- 1983-04-25
著者
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