New Functional Amorphous Calcium Phosphate Nanocomposites by Enzyme-Assisted Biomineralization

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• 作者：Ee Taek Hwang ; Rameshwar Tatavarty ; Jinyang Chung ; Man Bock Gu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：532-537
• 全文大小：379K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

In the present study, we report on enzyme-assisted formation of biomineralized amorphous calcium phosphate nanocomposites (ACP-NCs). About 100鈥?00 nm sizes of the spherical porous enzyme-assisted ACP-NCs were successfully synthesized via double reverse microemulsion, but no ACP-NCs formed without the enzyme. It is believed that the enzyme was used as an organic template or additive that could regulate the biomineralization process. The enzyme-assisted ACP-NCs were well characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, dynamic light scattering, and Brunauer鈥揈mmett鈥揟eller (BET) criteria. The BET surface area, total pore volume, pore size from adsorption, and pore size from desorption of the ACP-NCs were 163 m² g^鈥? or 0.37 cm³ g^鈥?, 8.87 nm, and 7.48 nm, respectively. The enzyme-assisted ACP-NCs retained about 43% of the catalytic activity of free carboxyl esterase. Furthermore, they preserved their bioactivity even after the 10th reuse and were stable over 10 days even under a stringent shaking conditions. The reported method paves the way for novel biomineralization via enzyme molecules to form functional enzymes containing nanocomposites.

Keywords:

enzyme; enzyme assisted biomineralization; bioinorganic nanocomposites; enzyme reuse; amorphous calcium phosphate; functional nanocomposites