2002 Fiscal Year Final Research Report Summary
Controlled essential rare-metal release from organic/inorganic nano-composite materials
| Project/Area Number |
13680958
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biomedical engineering/Biological material science
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| Research Institution | Kobe Pharmaceutical University |
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Principal Investigator |
MAKOTO Otsuka Kobe Pharmaceutical University, Department of Pharmaceutical Technology, Associate Professor, Ph.D., 薬学部, 助教授 (90160548)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Nano-Level structures / Organic / Inorganic composite particle / bio-essential rear metal / controlled drug release / biomaterials / drug delivery system / artificial bone cement / bioaffinity |
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| Research Abstract |
The effect of Zn release from ZnTCP was investigated for the purpose of understanding Zn release behavior from a sustained-release device. The tricalcium phosphate powders (Ca_2.7 Zn_0.3 (PO_4)_2), including a 10mol% of Zn (6.17w/w%), as new sustained-release preparations, were synthesized. The in-vitro Zn release profiles of ZnTCP powders at various Ca concentrations in SBF were significantly higher in SBF/- and SBF/L than in SBF/H. After injection of a ZnTCP suspension on the backs of the rats, the plasma Zn level increased for more than three weeks. After the injection of ZnTCP suspension, the plasma alkaline phosphatase activity (AIP) levels increased to more than 300 IU/L. The bioactive bone cement consisted of bisphenol-α-glycidyl methacrylate (Bis-GMA), triethylene-glycol dimethacrylate (TEGDMA) resin, apatite- and wollastonite-containing glass-ceramics (A-W GC) powder and 5% cephalexin (CEX). In-vitro CEX release from bioactive bone cement pellets in a simulated body fluid at pH 7.25 and 37℃ continued for more than 2 weeks. All of the drug release profiles followed the Higuchi equation at the initial stage, but not at later stages. The drug release rate increased with increasing amount of ceramics powder in the mixture. Since the pore volume of the cement increased with increasing of amount of ceramics powder, the drug diffused in the pores between the ceramics particle and polymer matrix. As hydroxyapatite was precipitated out on the cement surface, the drug release rate decreased at later release stage. These results suggest that varying the amount of ceramics powder in the cement system could control the drug release rate from bioactive bone cement.
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