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491 results on '"Kumagai, Hitoshi"'

204. Physicochemical and functional properties of buckwheat (Fagpopyrum esculentumMoench) albumin

Author

Ninomiya, Kazumi, Yamaguchi, Yusuke, Kumagai, Hitoshi, and Kumagai, Hitomi

Abstract

•Buckwheat albumin exhibited strong thermal resistance with a Tpnear 150 °C.•In solutions at pH 3–6, buckwheat albumin showed high solubility even after heating.•Emulsifying and foaming properties of buckwheat albumin were high in weak acidic pH.•Foaming capacity of buckwheat albumin was maintained even after hydrolysis.

Published
2022
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227. An electrochemical ionic liquid membrane reactor for NO selective separation under excess oxygen conditions.

Author

Sakamoto, Yoshiyuki, Kumagai, Hitoshi, and Matsunaga, Shinichi

Subjects
IONIC liquids, ALUMINUM oxide, OXYGEN, HYDROCARBONS, ELECTROLYTIC reduction
Abstract

A novel electrochemical ionic liquid membrane reactor capable of separating NO from a mixture of NO and oxygen with high current efficiency at low temperatures was designed and tested. This reactor consists of a combination of an ionic liquid and a thin film of anodised alumina with two platinum electrodes. During operation of the reactor, NO is electrically transported from the cathode side to the anode side. [ABSTRACT FROM AUTHOR]

Published
2013
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243. Metal-Organic Frameworks from Copper Dimers with cis- and trans-1 ,4-Cyclohexanedicarboxylate and cis,cis-1 ,3,5-Cyclohexanetricarboxylate.

Author

Kumagai, Hitoshi, Akita-Tanaka, Motoko, Inoue, Katsuya, Takahashi, Kazuyuki, Kobayashi, Hayao, Vilminot, Serge, and Kurmoo, Mohamedally

Subjects
*ORGANOCOPPER compounds, *DIMERS, *ORGANOMETALLIC compounds, *MOLECULAR structure, *X-ray crystallography, *ANTIFERROMAGNETISM, *HYDROGEN bonding
Abstract

Single crystals of three coordination networks containing the Cu2(COO)4 core bridged by cyclohexane have been hydrothermally prepared by the reaction of 1,4-cyclohexanedicarboxylic (1,4-H2chdc) or 1,3,5-cyclohexanetricarboxylic (1,3,5-H3chtc) acid and Cu(NO3)2·6H2O. We report their characterizations by single-crystal X-ray structure determinations, IR spectroscopy, thermal analyses, and their magnetic properties. [Cu2(trans-1,4-chdc)2] (1) consists of 4 × 4 grids with the dimeric nodes connected by the trans-1,4-chdc, and these grids are then connected to each other by Cu-O bonds, resulting in a porous network (void volume of 130 ų per cell or 25%) with no solvent in its cavities. [Cu2(cis-1,4-chdc)2(H2O)2] (2) consists of two-legged ladders where the dimer nodes are bridged by pairs of cis-1,4-chdc and the water molecules cap the ends of the Cu dimers. [Cu2(1,3,5-Hchtc)2] (3) displays 4 × 4 grids, but each dimeric node is connected to its neighbors within the same grid by Cu-O bonds to form a layered network which further makes hydrogen-bond interactions with its neighbors. 2 and 3 have compact structures without any space for solvents. IR and DT-TGA confirm the absence of water in the empty channels of 1, while IR shows the presence of both protonated and deprotonated carboxyl groups for 3. The magnetic properties of all three compounds are dominated by the strong Cu-Cu antiferromagnetic interaction resulting in singlet-triplet gaps of 450-500 K. [ABSTRACT FROM AUTHOR]

Published
2007
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248. Effect of phytate-removal and deamidation of soybean proteins on calcium absorption in the in situ rats.

Author

Kumagai, Hitomi, Koizumi, Atsushi, Sato, Noriko, Ishikawa, Yukako, Suda, Akihiro, Sakurai, Hidetoshi, and Kumagai, Hitoshi

Subjects
DEAMINATION, SOYBEAN, PROTEINS, PHOSPHORUS, LABORATORY rats
Abstract

Soybean proteins were deamidated by cation-exchange resins after phytate, the inhibitor for calcium absorption from the small intestine, was removed in order to provide the enhancement function of calcium absorption to soybean proteins. About 92% of the phosphorus was removed from the soybean proteins by anion-exchange-resin treatment, indicating that most of the phytate was removed. About 70% of the acid amide was deamidated by cation-exchange-resin treatment, and phytate-removed and deamidated soybean proteins (PrDS) having high calcium binding properties were obtained. PrDS were hydrolyzed by digestive enzymes and their calcium-binding properties and the enhancement function of the calcium absorption from the small intestine of rats were examined. As a result, PrDS retained their high calcium binding properties even after hydrolysis by digestive enzymes. In situ experiments showed that PrDS and their hydrolysates enhanced the calcium absorption from the intestine. [ABSTRACT FROM AUTHOR]

Published
2004
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250. Reversible Guest Exchange and Ferrimagnetism (T[sub c] = 60.5 K) in a Porous Cobalt(II)—Hydroxide Layer Structure Pillared with trans-1,4-Cyclohexanedicarboxylate.

Author

Kurmoo, Mohamedally, Kumagai, Hitoshi, Hughes, Suzanne M., and Kepert, Cameron J.

Subjects
*COBALT compounds, *POROUS materials, *MAGNETIC materials, *FERRIMAGNETISM
Abstract

Describes the synthesis, characterization and reversible guest-exchange chemistry of a porous Cobalt(II)-hydroxide layer structure pillared with trans-1,4-cyclohexanedicarboxylate magnetic material that orders ferrimagnetically. In-situ single crystal and powder X-ray diffraction analyses; Decrease in interlayer spacing; Loss of two water molecules per formula unit; Single crystal structure of the fully dehydrated material.

Published
2003
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