Shin-ichi Nagaoka
Ehime University
237 Papers
2.3K Citations
Shin-ichi Nagaoka is an academic researcher from Ehime University. The author has contributed to research in topics: Photoionization & Auger electron spectroscopy. The author has an hindex of 31, co-authored 235 publications. Previous affiliations of Shin-ichi Nagaoka include Kyoto University & National Institutes of Natural Sciences, Japan.
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Papers
Correlation among Singlet-Oxygen Quenching, Free-Radical Scavenging, and Excited-State Intramolecular-Proton-Transfer Activities in Hydroxyflavones, Anthocyanidins, and 1-Hydroxyanthraquinones
TL;DR: Singlet-oxygen (1O2) quenching, free-radical scavenging, and excited-state intramolecular proton-transfer (ESIPT) activities of hydroxyflavones, anthocyanidins, and 1-hydroxyanthraquinones were studied by means of laser, stopped-flow, and steady-state spectroscopies.
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Development of a Singlet Oxygen Absorption Capacity (SOAC) Assay Method. Measurements of the SOAC Values for Carotenoids and α-Tocopherol in an Aqueous Triton X-100 Micellar Solution.
TL;DR: Second-order rate constants (kQ) for the reaction of singlet oxygen (1O2) with eight different carotenoids and α-tocopherol (α-Toc) were measured in an aqueous Triton X-100 (5.0 wt %) micellar solution, demonstrating that the kQ values of AOs in homogeneous and heterogeneous solutions vary notably depending on the polarity of the reaction field.
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Development of a new free radical absorption capacity assay method for antioxidants: aroxyl radical absorption capacity (ARAC).
TL;DR: The aroxyl radical method has the advantage of treating a stable and isolable radical (aroxyl radical) in a user-friendly organic solvent (ethanol) and would be useful in free radical absorption capacity assay of antioxidative reagents and foods.
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Notable effects of the metal salts on the formation and decay reactions of α-tocopheroxyl radical in acetonitrile solution. The complex formation between α-tocopheroxyl and metal cations.
Yutaro Kohno,Miyabi Fujii,Chihiro Matsuoka,Haruka Hashimoto,Aya Ouchi,Shin-ichi Nagaoka,Kazuo Mukai +6 more
TL;DR: The results indicate that the hydrogen transfer reaction of α-TocH proceeds via an electron transfer intermediate from α- TocH to ArO(•) radicals followed by proton transfer, resulting in the acceleration of electron transfer.
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