Sol-gel synthesis, characterization, and in vitro compatibility of iron nanoparticle-encapsulating silica microspheres for hyperthermia in cancer therapy.
We prepared iron nanoparticle-encapsulating silica (FeSi) microspheres and tested their suitability as thermal seeds for hyperthermia in cancer therapy. These microspheres were prepared by introducing a ferric ion (Fe(3+)) into microspheres of a SiO(2) gel matrix derived from the hydrolysis of tetramethoxysilane in a water-in-oil emulsion that was then heat-treated at 850 °C in an argon atmosphere. The particles obtained were 5-30 μm in size and had a saturation magnetization up to 21 emu g(-1) and a coercive force of 86-133 Oe. Heat generation in an alternating current magnetic field of 300 Oe at 100 kHz was estimated to be 7.7-28.9 W g(-1). The in vitro cell biocompatibility of the microspheres was assessed by culturing rat fibroblast Rat-1 cells in medium supplemented with microspheres containing 6.7 % of iron nanoparticles. At microsphere concentrations of <7.5 g L(-1) proliferation of Rat-1 cells was not significantly inhibited.
College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China. zhixiali@hotmail.com
Zhixia
Z
Li
Masakazu
M
Kawashita
Tada-aki
TA
Kudo
Hiroyasu
H
Kanetaka
D001672:Biocompatible Materials; D018360:Crystallography, X-Ray; D005782:Gels; D006801:Humans; D006979:Hyperthermia, Induced; D066298:In Vitro Techniques; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D009369:Neoplasms / Q000628:therapy*; D012822:Silicon Dioxide / Q000737:chemistry*
D001672:Biocompatible Materials; D005782:Gels; D012822:Silicon Dioxide; D007501:Iron