Advances in nano research

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Preparation of silica-coated gadolinium compound particle colloid solution and its application in imaging

  • Kobayashi, Yoshio (Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University) ;
  • Morimoto, Hikaru (Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University) ;
  • Nakagawa, Tomohiko (Department of Nano-Medical Science, Graduate School of Medicine, Tohoku University) ;
  • Gonda, Kohsuke (Department of Nano-Medical Science, Graduate School of Medicine, Tohoku University) ;
  • Ohuchi, Noriaki (Department of Nano-Medical Science, Graduate School of Medicine, Tohoku University)
  • Received : 2012.08.24
  • Accepted : 2013.10.15
  • Published : 2013.09.25
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Abstract

A preparation method for gadolinium compound (GdC) nanoparticles coated with silica ($GdC/SiO_2$) is proposed. GdC nanoparticles were prepared with a homogeneous precipitation method at $80^{\circ}C$ using $1.0{\times}10^{-3}$ M $Gd(NO_3)_3$, 0.5 M urea and $0-3.0{\times}10^{-4}$ M ethylenediarinnetetraacetic acid disodium salt dihydrate (ETDA) in water. As a result of preparation at various EDTA concentrations, GdC nanoparticles with a size as small as $40.5{\pm}6.2$ nm, which were colloidally stable, were prepared at an EDTA concentration of $2.0{\times}10^{-4}$ M. Silica-coating of the GdC nanoparticles was performed by a St$\ddot{o}$ber method at $35^{\circ}C$ using $1.0-10.0{\times}10^{-3}$ M tetraethylorthosilicate (TEOS), 11 M $H_2O$ and $1.5{\times}10^{-3}$ M NaOH in ethanol in the presence of $1.0{\times}10^{-3}$ M GdC nanoparticles. Performance of preparation at various TEOS concentrations resulted in production of $GdC/SiO_2$ particles with an average size of $106.1{\pm}11.2$ nm at a TEOS concentration of $5.0{\times}10^{-3}$ M. The gadolinium (Gd) concentration of $1.0{\times}10^{-3}$ M in the as-prepared $GdC/SiO_2$ particle colloid solution was increased up to a Gd concentration of 0.2 M by concentrating with centrifugation. The core-shell structure of $GdC/SiO_2$ particles was undamaged, and the colloid solution was still colloidally stable, even after the concentrating process. The concentrated $GdC/SiO_2$ colloid solution showed images of X-ray and magnetic resonance with contrast as high as commercial Gd complex contrast agents.

Keywords

References

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