A5078371702- Oxidative Organic Chemistry Reactions
- Catalysis and Oxidation Reactions
- Helicobacter pylori-related gastroenterology studies
- Chemical Synthesis and Reactions
- Inorganic and Organometallic Chemistry
- Particle Accelerators and Free-Electron Lasers
- Free Radicals and Antioxidants
- Catalytic Processes in Materials Science
- Coal and Coke Industries Research
- Catalysis and Hydrodesulfurization Studies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Radical Photochemical Reactions
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Porphyrin and Phthalocyanine Chemistry
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Gastroesophageal reflux and treatments
- Photochemistry and Electron Transfer Studies
- Renewable energy and sustainable power systems
- Chemical Reactions and Mechanisms
- Building energy efficiency and sustainability
- Particle physics theoretical and experimental studies
Osaka University
2025
The University of Tokyo
2013-2024
Kyungpook National University
2021
Institut Laue-Langevin
2021
Fujita Health University
2004-2012
Kanazawa Medical University
2009-2011
Jichi Medical University
2011
Jichi Medical University Saitama Medical Center
2011
Waseda University
2006-2008
Fujita Health University Hospital
2007-2008
The oxidation of methyl linoleate in solution initiated with azo compounds has been studied the absence and presence vitamin E C. Both C acted as a chain-breaking antioxidant they suppressed produced an induction period.The inhibition rate constant for scavenging peroxy radical was calculated at 37 OC A+ = 6.1 x 1 0 ' M" s-l 7.6 lo4 vitamln C, respectively.It suggested that each could trap two radicals, whereas only one under reaction conditions employed this study.When both were present,...
Abstract α-Chromanoxyl radical formed by the interaction of α-tocopherol (vitamin E) with alkoxyl or DPPH was found electron spin resonance spectroscopy to react glutathione and vitamin C regenerate α-tocopherol.
Inhibition of the oxidation methyl linoleate and soybean phosphatidylcholine in homogeneous solution aqueous dispersion by four chain-breaking antioxidants, vitamin E (a-tocopherol), 2,2,5,7,8pentamethyl-6-chromanol, 2,6-di-tert-butyl-4-methylphenol, stearyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, was studied to examine effect phytyl side chain on its antioxidant activity.These antioxidants exerted similar antioxidative activities.They were also effective as protecting liposomes...
Abstract Vitamin E acted as an efficient antioxidant in the oxidation of soybean phosphatidylcholine liposome aqueous dispersion initiated by free radicals generated initially either phase or lipid phase. decayed linearly with time, and when it was exhausted, proceeded rapidly at a similar rate to that absence vitamin E. C also effective itself scavenging phase, but could not scavenge efficiently bilayer. However, located bilayer, addition into prolonged period suppression reduced decay...
Abstract The activity of uric acid as a chain-breaking antioxidant was studied in the oxidations methyl linoleate micelles and soybean phosphatidylcholine liposomes aqueous dispersions at 37°C. Uric found to act radical scavenger. located an phase could trap radicals phase, but it not scavenge within lipid region liposomal membranes. kinetics lipids inhibited by discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOzonation of organic compounds. 2. Ozonation phenol in waterYorihiro Yamamoto, Etsuo Niki, Hiroyo Shiokawa, and Yoshio KamiyaCite this: J. Org. Chem. 1979, 44, 13, 2137–2142Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.acs.org/doi/10.1021/jo01327a021https://doi.org/10.1021/jo01327a021research-articleACS PublicationsRequest reuse permissionsArticle...
Abstract The rate and products of oxidation methyl linoleate dispersed in water by Triton X-100 were measured at 50 °C. was initiated water- or oil-soluble azo-initiators. proceeded smoothly both types initiators without any noticeable induction period a constant oxygen uptake observed. Conjugated diene hydroperoxides formed almost quantitatively. oxidizability for aqueous dispersion obtained as kp/(2kt)1⁄2=0.032(s·mol/L-oil)−1⁄2 where kp kt are the constants propagation termination...
We report on a new constraint gravitylike short-range forces, in which the interaction charge is mass, obtained by measuring angular distribution of 5 Å neutrons scattering off atomic xenon gas. Around 10^{7} events were collected at 40 m small angle neutron beam line located HANARO research reactor Korean Atomic Energy Research Institute. The extracted coupling strengths forces Yukawa-type parametrization are g[over ^]^{2}=(0.2±6.8±2.0)×10^{-15} GeV^{-2} and...
A free relativistic electron in an electromagnetic field is a pure case of light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with beams produced from particle accelerators. The process single photon absorption and reemission electron, so-called linear Thomson scattering, results radiation that Doppler shifted into x-ray gamma-ray regions. At elevated intensity, nonlinear effects should come play when transverse motion...
The transcription factor Nrf2 regulates the expression of detoxifying and antioxidant genes. Three polymorphisms gene have been reported. We attempted to clarify relationship between polymorphism chronic gastritis in a Japanese population. study was performed 159 patients with no evidence gastric malignancy on upper gastrointestinal endoscopy (mean age, 62.03 years; male:female ratio, 102:57; peptic ulcer diseases 69 patients, Helicobacter pylori (H. pylori) positivity 73.0%). employed...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin trapping of peroxy radicals by phenyl N-(tert-butyl) nitrone and methyl N-duryl nitroneEtsuo Niki, Seiichi Yokoi, Jyunichi Tsuchiya, Yoshio KamiyaCite this: J. Am. Chem. Soc. 1983, 105, 6, 1498–1503Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983https://pubs.acs.org/doi/10.1021/ja00344a014https://doi.org/10.1021/ja00344a014research-articleACS PublicationsRequest reuse...
Abstract The antioxidant activities of α-, β-, γ-, and δ-tocopherols were studied. They all effective as in the oxidations methyl linoleate homogeneous solution. When one four tocopherols was used alone, they consumed at same rate suppressed oxidation for period. However, stabilities chromanyloxyl radicals derived from corresponding varied considerably decreased order α>β≅γ>δ -chromanyloxyl radicals. α-Tocopherol reacts quite rapidly with δ-chromanyloxyl to give α-chromanyloxyl...
Inflammation is a key factor in the process of carcinogenesis from chronic gastritis induced by Helicobacter pylori. Selenoprotein S (SEPS1) involved control inflammatory response endoplasmic reticulum (ER). Recently -105G>A polymorphism promoter SEPS1 was shown to increase pro-inflammatory cytokine expression. We examined association between this and risk gastric cancer. took stomach biopsies during endoscopies 268 Japanese cancer patients (193 males 75 females, average age 65.3), 306 (184...
Abstract The extent of oxidation methyl linoleate and linolenate has been measured quantitatively by several methods such as oxygen uptake, substrate disappearance, formation conjugated diene, TBA-reactive material hydrocarbon gas. In the early stage linoleate, peroxide diene were all quantitative their results agreed well each other. Little hydrocarbons observed. linolenate, however, no product was formed quantitatively, estimated decreased in order, uptake>substrate...
The effects of oxygen pressure, substrate concentration and solvent on the rate products oxidation methyl linoleate were studied at 50 C with azobisisobutyronitrile as a radical initiator. absolute quantitative numbers for uptake, disappearance, formation conjugated diene hydroperoxides measured. Under present conditions, 4 hydroperoxides, 13-hydroperoxy-9-cis, 11-trans-(2a), 13-hydroperoxy-9-trans, 11-trans-(3a), 9-hydroperoxy-10-trans, 12-cis-(4a), 12-trans-(5a) octadecadienoic acid...
The catalysis of the autoxidation tetralin by cobalt salts 10 organic acids has been examined at 50 °C over a concentration range from 2 × −6 to 1.0 mole/l, cobalt. measured rate oxidation reaches limiting value concentrations above −2 mole/l., which is about half expected rate. salt catalysts are deactivated during oxidation, probably in initiation reaction with hydroperoxide, each atom being capable decomposing 100 molecules hydroperoxide. Upon correcting for deactivation and amount...
The catalysis of the autoxidation tetralin by decanoates manganese, copper, nickel, and iron has been examined over a large concentration range at 50 °C. With all four metals oxidation rate approaches limit high catalyst concentrations but in each case this is smaller than theoretical maximum pure (Y. Kamiya etal. Can. J. Chem. 41, 2020 (1963)). However, upon dilution with an inert solvent, such as chlorobenzene, or metal acetates, acetic acid, attained. low limiting rates are apparently due...
The catalytic effect of transition metal salts on the rate autoxidation organic substances reaches a constant value at some critical catalyst concentration. Three possible explanations this phenomena are critically examined. cobalt acetate catalyzed tetralin in acetic acid has been reinvestigated and limiting oxidation high concentrations shown to be due production steady-state concentration hydroperoxide. present results fair agreement with experimental work Woodward Mesrobian (J. Am. Chem....
The limiting rate of oxidation tetralin catalyzed by cobalt, manganese, and copper decanoates has been measured in 12 solvents at 65 °C. This is generally determined the kinetic condition that hydroperoxide reaches a steady-state concentration but experimental rates are smaller than expected some solvents. Both cobalt manganese able to terminate reaction chains they therefore act as inhibitors high concentrations. ratio propagation constant (k 3 ) square root termination 6 for acetic acid...