Nagoya Research Institute

Chikusa ku, Japan

Nagoya Research Institute

Chikusa ku, Japan
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Ohsato H.,Hoseo University | Ohsato H.,Nagoya Institute of Technology | Ohsato H.,Nagoya Research Institute
Ceramics International | Year: 2012

In coming age, new technologies for survivals of human beings on our earth are required. These technologies include for energy and natural resources conservation, waste disposal techniques, and reduction of global warming gases. To achieve this advanced functions of materials are essential. In this paper, new frontiers of microwave dielectrics are presented in relations with these energy issues. The microwave dielectrics are familiar with radio frequency wave. The low loss dielectric materials are resonated by microwaves in air and change it to electric current in circuit, and vice versa. It is well known that the microwave materials have three important characteristic properties such as high quality factor Q, dielectric constant ε r and temperature coefficient of resonant frequency TCf. These properties enable the following functions: (1) electromagnetic resonance, (2) electromagnetic-wave shortening, (3) electromagnetic-wave delay, (4) temperature variation of resonant frequency, (5) electromagnetic-wave absorption, and (6) other functions: such as transparency and refractive index. In this paper, for future excellent usages of these functions, some applications are presented showing the fundamental explanations. The content in this paper is planned for the publication in a handbook of advancements of functional ceramics. © 2011 Elsevier Ltd and Techna Group S.r.l.


Nagai T.,Yamagata University | Nagai T.,Iwate University | Nagai T.,Prince of Songkla University | Kai N.,National Fisheries University | And 2 more authors.
Journal of Medical Sciences (Faisalabad) | Year: 2013

This study investigated chemical parameter of beverage made from fully ripened silver vine berries and the health-promoting property. The beverage was rich in phenolic compounds and vitamin C as follows: 283.5 and 185.3 (μg mL-1), respectively. According to sensory tests, colour, taste and aroma (Brix: acid ratio), body, and overall acceptability of beverage were observed highly acceptable when the concentrated beverage-hot water were blended in the ratio of 20:80. Moreover, this beverage possessed the strongest and beneficial potential, which had higher inhibitory effects of lipid peroxidation, scavenging effects on superoxide anion radicals, hydroxyl radicals, and 1,1-dipheny 1-2-picrylhydrazyl (DPPH) radicals, and ACE inhibitory effects in comparison with ascorbic acid and a-tocopherol used as controls. Our present findings suggests that beverage made from fully ripened silver vine berries may be useful for prevention of chronic diseases associated with free radical induced injury, coronary heart disease, high blood pressure and cancer etc.


Nagai T.,Yamagata University | Nagai T.,Iwate University | Nagai T.,Prince of Songkla University | Tanoue Y.,National Fisheries University | And 2 more authors.
Journal of Food Science and Technology | Year: 2015

Collagen from emu skins as a by-product was prepared. The skins were hardly solubilized in acetic acid, however were successfully solubilized on digestion with 10 % pepsin (w/w) for 4 days. The yield of pepsin-solubilized collagen (PSC) was about 27.3 %, on a raw weight basis. By SDS-PAGE and CM-Toyopearl 650 M column chromatography, the presence of a fourth subunit that was previously designated α4 was confirmed. The denaturation temperature of the PSC was 31.5 °C, about 6–7 °C lower than that from the porcine skins. ATR-FTIR analysis indicated that the helical arrangements of the PSC from emu skins existed and its structures of PSC were changed slightly due to the loss of N- and C-terminus domains in similar to that from the porcine skins. That is, the PSC from emu skins did not possess telopeptide chains as major portion of antigenic sites in collagen. The present study indicates that a large quantity of emu skins as by-products have potential as a good alternative source of high-quality collagen for industrial purposes in the foods, cosmetics, and pharmaceutical and biomedical fields. © 2014, Association of Food Scientists & Technologists (India).


Ohsato H.,Hoseo University | Ohsato H.,Nagoya Research Institute | Kim J.-S.,Hoseo University | Kim A.-Y.,Hoseo University | And 2 more authors.
Japanese Journal of Applied Physics | Year: 2011

Millimeter-wave wireless communications with high data transfer and radar system for Pre-Crash Safety System have been developed recently. Cordierite (Mg2Al4Si5O18) is one of the silicates with good millimeter-wave dielectric properties. Cordierite has two polymorphs: cordierite and indialite. Cordierite is of low symmetry form with ordered structure, and indialite is of high symmetry form with disordered structure. In this study, indialite/cordierite glass ceramics are fabricated with good millimeter-wave properties. The Qf values are dependent on the amount of indialite phase and crystallization conditions. Indialite with high symmetry showed higher Qf values than cordierite with low symmetry. This result clearly shows that high symmetry results in high Qf when the samples are prepared under the same crystallization conditions. However, these glass ceramics are very difficult to make under the same conditions because of non-uniform crystallization. These dielectric glass ceramics show high Qf values of >200;000 GHz, low dielectric constant εr = 4.7, and TCf = -27 ppm/°C. © 2011 The Japan Society of Applied Physics.


Nagai T.,Prince of Songkla University | Inoue R.,Inoue Yohojo Bee Farm Inc. | Suzuki N.,Nagoya Research Institute | Tanoue Y.,National Fisheries University | Kai N.,National Fisheries University
Journal of Apicultural Research | Year: 2012

A-Amylase was purified from mandarin orange honey by DEAE-Toyopearl 650M, CM-Toyopearl 650M, and Toyopearl HW-55F column chromatographies, and characterized. The molecular weight of the purified enzyme was estimated to be about 58 kDa by Toyopearl HW-55F gel chromatography and SDS-PAGE, suggesting that the purified enzyme was a monomer. The purified enzyme exhibited optimum activity at pH 5.0 and at 50°C. Inactivation of the enzyme occurred when the pH was lower than 3.0 or higher than 9.0. The enzyme was activated by Co 2+, Mn 2+, but inhibited by Hg 2+, Mg 2+, and Fe 3+. By TLC analysis, this enzyme was of the a-type that split the interior a-1,4-glycosidic bonds in a random manner. The relative rate of hydrolysis of the polymeric substrate decreased with decreasing percentage of a-1,4-linkages and with increasing percentage of a-1,6-linkages in substrate similar to the results from commercially available honey. © IBRA 2012.


PubMed | Tokyo University of Agriculture and Nagoya Research Institute
Type: Journal Article | Journal: Food chemistry | Year: 2015

Collagen was prepared from common minke whale unesu and characterised. The yield of collagen was high, about 28.4% on a wet weight basis. By SDS-PAGE and CM-Toyopearl 650M column chromatography, the collagen was classified as type I collagen. The denaturation temperature of the collagen was 31.5C, about 6-7C lower than that of porcine collagen. Attenuated total reflectance-FTIR analysis indicated that acid-soluble collagen from common minke whale unesu held its triple helical structure well, but the structures of porcine skin collagen and pepsin-solubilized collagen from common minke whale unesu were changed slightly, due to the loss of N- and C-terminus domains.


Nagai T.,Yamagata University | Nagai T.,Iwate University | Nagai T.,Prince of Songkla University | Tanoue Y.,National Fisheries University | And 2 more authors.
International Food Research Journal | Year: 2014

Hydrolysis was applied to collagen of Yezo sika deer tendon using six proteases (pepsin, trypsin, papain, chymotrypsin, pronase E, and thermolysin). The yields of hydrolysates and its protein contents ranged from 69 to 96% (w/w) and 185.7 to 260.6 μg/mg lyophilized powder, respectively. Next, the functional properties of hydrolysates were demonstrated using a different four systems. Antioxidative activities were moderate; the hydrolysates prepared by pepsin, trypsin, chymotrypsin, and pronase E showed the same activities as 1 mM ascorbic acid. Reactive oxygen species scavenging activities were also measured. Highly scavenging activities were observed in pronase E, papain, and chymotrypsin hydrolysates. On the other hand, thermolysin hydrolysate strongly inhibited ACE activity. From the above investigation, Yezo sika deer tendon can be used as an easily accessible underutilized bioresource of natural antioxidants, ACE inhibitors, and as a possible food supplement or in biomedical fields and pharmaceutical industry. © All Rights Reserved.


Nagai T.,Yamagata University | Nagai T.,Iwate University | Nagai T.,Prince of Songkla University | Suzuki N.,Nagoya Research Institute | And 2 more authors.
Journal of Food Science and Technology | Year: 2014

Yam tsukuneimo tuber mucilage tororo hydrolysates were prepared by autolysis and three different peptic enzymes. Except for pepsin hydrolysate, tororo was perfectly digested. Each hydrolysate for 100 mg/ml significantly prolonged the induction period of auto-oxidation of linoleic acid, which was similar to 5 mM ascorbic acid. These hydrolysates also possessed high scavenging activities such as superoxide anion radicals, hydroxyl radicals, and DPPH radicals. Moreover, high antihypertensive activities were detected in these hydrolysates except for autolysate, which were similar to various fermented foods such as miso, natto, sake, cheese, and so on. Present findings suggest that yam tsukuneimo tuber mucilage tororo may be useful for preventing diseases associated with reactive oxygen species and blood pressure in the body system and it can fully absorb the useful components from it to digest using the gastrointestinal enzymes. © 2012, Association of Food Scientists & Technologists (India).


PubMed | National Fisheries University, Nagoya Research Institute and Prince of Songkla University
Type: Journal Article | Journal: Journal of food science and technology | Year: 2015

Collagen from emu skins as a by-product was prepared. The skins were hardly solubilized in acetic acid, however were successfully solubilized on digestion with 10% pepsin (w/w) for 4days. The yield of pepsin-solubilized collagen (PSC) was about 27.3%, on a raw weight basis. By SDS-PAGE and CM-Toyopearl 650M column chromatography, the presence of a fourth subunit that was previously designated 4 was confirmed. The denaturation temperature of the PSC was 31.5C, about 6-7C lower than that from the porcine skins. ATR-FTIR analysis indicated that the helical arrangements of the PSC from emu skins existed and its structures of PSC were changed slightly due to the loss of N- and C-terminus domains in similar to that from the porcine skins. That is, the PSC from emu skins did not possess telopeptide chains as major portion of antigenic sites in collagen. The present study indicates that a large quantity of emu skins as by-products have potential as a good alternative source of high-quality collagen for industrial purposes in the foods, cosmetics, and pharmaceutical and biomedical fields.

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