Papers by Author: Kanji Tsuru

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Authors: A.G. Dias, M.A. Lopes, Kanji Tsuru, Satoshi Hayakawa, José D. Santos, Akiyoshi Osaka
Abstract: This work reports the structure of two glass ceramics prepared in the calcium phosphate system, MK5B and MT13B, using 31P MAS-NMR technique. The results obtained showed that the network of MK5B consisted mainly of Q1 and Q2 groups. Besides these two groups, MT13B material also present Q3 units. The Qn groups detected in both glass ceramics seem to be correlated to the crystalline phases present in their microstructure.
Authors: Satoshi Hayakawa, K. Shibata, Kanji Tsuru, Akiyoshi Osaka
Authors: Yuki Shirosaki, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka
Abstract: Porous chitosan-silicate hybrids were prepared by freeze-drying the precursor sol solutions synthesized from chitosan and 3-glycidoxypropyltrimethoxysilane (GPTMS). Degradability of and the release of cytochrome C in to phosphate buffer saline solution (PBS) were examined as a function of the GPTMS content. The hybrids were less degradable with larger GPTMS contents, and the cytochrome C release profile was so controllable as to give either burst release or slow one due to the GPTMS content. Thus, the present porous chitosan-silicate hybrids were considered applicable to drug delivery systems.
Authors: K. Shibata, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka
Authors: Akiyoshi Osaka, Dimitri Aslanidis, Satoshi Hayakawa, Kanji Tsuru
Authors: Dimitri Aslanidis, Akiyoshi Osaka, Satoshi Hayakawa, Kanji Tsuru
Authors: S. Takashima, S. Takemoto, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka
Authors: S. Takemoto, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka, S. Takashima
Authors: Akiyoshi Osaka, Tomohiko Yoshioka, Takeshi Yabuta, Kanji Tsuru, Satoshi Hayakawa
Abstract: Organic-inorganic hybrids involving Ti-O bonds were coated on stainless-steel (SUS316L)substrates. Tetraisopropoxide and titanium methacrylate triisopropoxide were employed as the major starting chemicals to provide TiO2-polydimethylsiloxane (PDMS) layers or organotitanium molecular thin layers, respectively. Fourier transform infrared spectra indicated that each layer contained Ti-O bonds in their structure. The obtained hybrid layers had little effects on the blood-clotting times such as active partial thromboplastin time and prothrombin time. In addition, the number of adhered platelet on the TiO2-PDMS layers depended on the composition, while the organotitanium molecular thin layers suppressed fibrinogen adsorption compared with coating-free SUS 316L substrate.
Authors: Jin Fang Liu, Satoshi Hayakawa, Kanji Tsuru, Jian Zhong Jiang, Akiyoshi Osaka
Abstract: Rutile films were deposited on polyethylene terephatalate (PET), polytetrafluoroethylene (PTFE), Silicone, poly6-caprolactam (Nylon6), polyhexamethylene adipamide (Nylon6,6) and Nylon fiber substrates using 0.03 M TiOSO4 and 0.03 M H2O2 aqueous solution at 80°C for 24 h. The rutile films exhibited excellent in vitro bioactivity as they induced apatite deposition in a simulated body fluid (SBF).
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