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Volume 52, Issue 3
Special Issue of 50th Summer Symposium
Displaying 1-6 of 6 articles from this issue
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Review
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Itaru Sotome2015 Volume 52 Issue 3 Pages 113-120
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL RESTRICTED ACCESSThis review summarizes some research projects on food powder processing in the National Food Research Institute including precision milling of buckwheat flour, investigation of mycotoxin retention in the wheat flour products after processing, utilization of rice flour, fine milling technology for rice flour, as well as fluidized bed granulation technology with steam-water two-phase （SWTP） binder. This review specially introduces flowability of the rice flour having mean particle diameter less than 30 μm and the effects of SWTP binder for reducing the processing time and costs for food powder granulation.View full abstractDownload PDF (1143K) -
Koreyoshi Imamura2015 Volume 52 Issue 3 Pages 121-131
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL RESTRICTED ACCESSAn amorphous matrix of sugars, which are frequently used in the pharmaceutical and drug industries, is often compressed into a tablet to facilitate handling. Herein, the influences of compression on physicochemical properties of an amorphous sugar matrix are reviewed in this paper. Amorphous sugar samples, prepared by freeze-drying, were compressed at 0～667 MPa and rehumidified at given relative humidities. The macro structure, true density, water sorption （including interaction states of sorbed water）, glass transition temperature, crystallization characteristics, and protein stabilizing effects of compressed samples were analyzed and compared to those for uncompressed ones.View full abstractDownload PDF (1757K)
Original Paper
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Akinori Yoshihara, Hisaya Narahara, Katsuhiro Sasano, Syunsuke Toyoda ...2015 Volume 52 Issue 3 Pages 132-138
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL FREE ACCESSThe effect of extracellular polymeric substance （EPS） and filamentous appendages （flagella and pili） on microbial adhesion onto solid surfaces was investigated using DLVO theory and thermodynamic approaches. Nonmotile Lactococcus lactis and motile Escherichia coli were used as model microbes. Negatively and positively charged silica particles and glass slide were used as model substrates. The estimated surface potentials and tensions of microbial cells and substrates were used for the prediction of microbial adhesion. As a result, the microbial cells with EPS or filamentous appendages were able to adhere to solid surfaces even though the DLVO theory predicted an insurmountable potential barrier in low ionic strength. The adhesion of nonmotile Lactococcus lactis onto the silica particles was promoted in the presence of EPS. In contrast, the effect of EPS on adhesion of motile Escherichia coli onto the glass substrate was reduced in the presence of filamentous appendages.View full abstractDownload PDF (1475K)
Short Communication
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Yoko Hanada, Mutsuko Nomura, Hirohisa Suzuki, Hidehiro Kamiya2015 Volume 52 Issue 3 Pages 139-144
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL FREE ACCESSControlling the dispersion behavior of TiO2 nanoparticles in hydrophobic liquids, such as silicone oil, is important for their application to sunscreen and other cosmetic products. To elucidate the role of surface modification at the nanoparticle / liquid interface, in this study, effects of the modified surface structure and interaction between TiO2 and different types of surface modification agents bearing a perfluoroalkyl group, namely triethoxytridecafluoro-n-octylsilane (FHS) and perfluoroalkyl phosphate (PF), were investigated using the colloid probe AFM method. The modified surface structure depended on the molecular structure and adsorption mechanism of the agent. FHS adsorption on TiO2 resulted in a uniform surface structure, whereas PF adsorption led to a non-uniform granular structure. A long-range attractive force was observed between PF-modified TiO2 particles in silicone oil, which likely promoted their aggregation, thus increasing the viscosity of the suspension. On the contrary, the attractive force in the case of the FHS-treated surface disappeared after surface modification, thus enhancing the dispersion stability in silicone oil.View full abstractDownload PDF (1355K) -
Yuta Ohno, Tooru Andoh, Shinichiro Tsue, Kenji Sugisawa, Yoshinobu ...2015 Volume 52 Issue 3 Pages 145-149
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL FREE ACCESSUltra-low molecular hydroxypropylcellulose （HPC-UL） is a water-soluble polymer being developed as a novel pharmaceutical excipient. In this study, we focused on a low-viscosity characteristic of HPC-UL, and investigated its performance as a binder for drug-layering onto fine core particles with a mass median diameter smaller than 100μm by a spouted-bed spraying process. Drug-layering of lactose core particles （63～75μm） was carried out by spraying HPC-UL aqueous solution containing carbazochrome sodium sulfate （CCSS, a water-soluble model drug） using the spouted-bed spray-coater. As reference binders, commercial low-viscosity hydroxypropylcellulose （HPC-SSL） and polyvinylpyrrolidone （PVP） were used. The results showed that HPC-UL was found to provide a high product yield （more than 90％）, a low agglomeration tendency （less than 10％）, and a high drug-layering efficiency among four types of the binders employed here, suggesting that HPC-UL would be a useful binder for drug-layering onto fine core particles.View full abstractDownload PDF (1132K)
Original Paper
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Kenji Iimura, Mizuki Haruo, Hiroshi Satone, Michitaka Suzuki2015 Volume 52 Issue 3 Pages 150-155
Published: March 10, 2015
Released on J-STAGE: April 02, 2015
JOURNAL FREE ACCESSCentrifugal spinning of fibers with core-shell structure was tried by developing double tube nozzle spinneret. Obtained fibers were classified into three types according to fiber size. It seems plausible to infer that thin fibers are composed of only core material and thick ones are composed of only shell material. By contrast, it was clearly confirmed by observation with optical microscope that fibers have core-shell structure for medium size range around 10μm in diameter. In order to discuss the condition to obtain core-shell structured fiber, analysis based on the Hagen-Poiseuille equation focusing on the exit velocity at tip of spinneret has been conducted. As a result, relatively good agreement in exit velocity was found between core and shell materials.View full abstractDownload PDF (1727K)
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