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Hydroxyapatite particles as a controlled release carrier of protein

Paper ID Volume ID Publish Year Pages File Format Full-Text
13060 828 2004 6 PDF Available
Title
Hydroxyapatite particles as a controlled release carrier of protein
Abstract

This study examines the possibility of using hydroxyapatite (HAp) particles as a controlled release carrier of protein. In order to achieve effective protein release from HAp particles, it is necessary to regulate the conjugated amount of protein on HAp and the resorption of HAp. HAp particles were synthesized at different temperatures (40°C, 60°C, 80°C) in wet condition and the physico-chemical properties of synthesized HAp particles were examined. HAp particles synthesized at low temperatures showed low crystallinity, high solubility and large specific surface area. The useful growth factors for bone regeneration, such as BMP, bFGF and TGF-β, are basic proteins, so cytochrome c (pI=10.2) was used as a model protein and the adsorptive property of protein on HAp particles was investigated. The protein adsorption on HAp particles changed depending on its specific surface area and the chart of protein adsorption on HAp particles showed a typical Langmuir curve. These findings suggest that the adsorbed amount of protein on HAp particles could be regulated by HAp synthesizing temperature and the concentrations of protein solution. The release kinetics of protein from the HAp particles that adsorbed the protein (HAp-pro) was also evaluated in different pH solutions (pH 4.0 and 7.0). The released protein gradually increased time dependently when HAp-pro were immersed in pH 4.0 solution, but the released protein was significantly smaller when HAp-pro were immersed in pH 7.0 solution. Moreover, the release rate of protein from HAp-pro differed in each HAp that was synthesized at different temperatures, suggesting that the release of protein from HAp-pro depended on HAp resorption. These results suggest that HAp particles synthesized at different temperature are useful as a controlled release carrier of protein.

Keywords
Hydroxyapatite; Particulates; Protein; Controlled drug release; Carrier
First Page Preview
Hydroxyapatite particles as a controlled release carrier of protein
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 17, August 2004, Pages 3807–3812
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering