Adsorption of Bovine Serum Albumin on Synthetic Carbonate Calcium Hydroxyapatite

✍ Scribed by Kazuhiko Kandori; Miwa Saito; Taro Takebe; Akemi Yasukawa; Tatsuo Ishikawa

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 435 KB
• Volume: 174
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1995.1373

✦ Synopsis

Carbonate calcium hydroxyapatites (CAP) containing various amounts of carbonate ions from 0 to (10.1 \mathrm{wt} . %) were synthesized, and the adsorption behavior of bovine serum albumin (BSA) on these synthetic CAPs was investigated at (\mathrm{pH} 6.0) and (15^{\circ} \mathrm{C}). The size of the synthetic CAP particles decreased by uptaking (\mathrm{CO}{3}^{2-}) ions. The FTIR spectra of CAPs revealed that the (\mathrm{CO}{3}^{2-}) ions are substituted for both (\mathrm{OH}^{-})and (\mathrm{PO}{4}^{3-}) ions. However, no remarkable difference was detected among the surface properties of these CAPs. The adsorption isotherms of BSA on CAPs were pseudoLangmuir type. The saturated amounts of adsorbed BSA (\left(n{s}\right)), which is the plateau value of the adsorption isotherms. decreased with ann inerense in (\mathrm{CO}_{3}^{2}) ien content in CAl's. This fact could be explained by the difference in the particle textures of CAPs, the large rod-like particles with flat surface are advantageous for the adsorption of negatively charged BSA by the large number of positively charged adsorption sites on the exposed (a c) or (b c) crystal planes. It was considered therefore that the particle texture is significant in the adsorption of BSA. 1995 Academic Press, Inc.