Search Results - "Nihei, Ken"

A natural diphenolic glucoside, sonnerphenolic C: Chemical synthesis, structural revision, redox transformation, and identification as an antioxidant by Shimakage, Ryo, Iwadate, Takehiro, Nihei, Ken-ichi

“…To investigate the redox o-hydroxylation of epirhododendrin (1) with tyrosinase and vitamin C, the possible product, sonnerphenolic C (2), and its epimer,…”
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Benzonitriles as tyrosinase inhibitors with hyperbolic inhibition manner by Nihei, Ken-ichi, Kubo, Isao

“…As a novel mushroom tyrosinase inhibitor, 4-methoxybenzonitrile (anisnitrile) was identified (IC50 = 111.1 μM) with hyperbolic inhibition manner. The…”
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Tyrosinase Inhibition by 4-Substituted Benzaldehydes with Electron-Withdrawing Groups by Nihei, Ken-ichi, Kubo, Isao

“…The oxidation of 4- t -butylcatechol catalyzed by mushroom tyrosinase was inhibited by 4-bromobenzaldehyde, 4-chlorobenzaldehyde, 4-fluorobenzaldehyde,…”
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Synthesis, structural revision, and tyrosinase inhibitory activity of proposed phloretin-4-O-β-D-glucopyranoside from Homalium stenophyllum by Shimakage, Ryo, Nihei, Ken-ichi

“…Phloretin-4-O-β-D-glucopyranoside (1), isolated from Homalium stenophyllum, was synthesized for the first time through aldol condensation and Schmidt…”
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Resorcinol alkyl glucosides as potent tyrosinase inhibitors by Ishioka, Wakana, Oonuki, Sayaka, Iwadate, Takehiro, Nihei, Ken-ichi

“…[Display omitted] •Resorcinol alkyl glucosides 7–12 were developed as novel tyrosinase inhibitors.•The inhibitory activity of 7–12 increased with the length of…”
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Total synthesis of apios isoflavones and investigation of their tyrosinase inhibitory activity by Asebi, Nana, Nihei, Ken-ichi

“…Apios isoflavone glucosides 1 and 2 were synthesized for the first time via Friedel–Crafts reaction, Bischler–Napieralski-type cyclization, and phase-transfer…”
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Substituent effect of benzaldehydes on tyrosinase inhibition by Nihei, Ken-ichi, Kubo, Isao

“…Benzaldehyde inhibited the oxidation of 4-t-butylcatechol catalyzed by mushroom tyrosinase with an IC50 of 31.0 μM. The inhibition kinetics analyzed by Dixon…”
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Molecular design of potent, hydrophilic tyrosinase inhibitors based on the natural dihydrooxyresveratrol skeleton by Tanaka, Yuri, Suzuki, Marina, Kodachi, Yuka, Nihei, Ken-ichi

“…In this study, dihydrooxyresveratrol glucosides 3–6 were synthesized for the first time to the best of our knowledge by the Wittig reaction and Schmidt…”
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Chemical synthesis and tyrosinase-inhibitory activity of isotachioside and its related glycosides by Matsumoto, Takashi, Nakajima, Takuya, Iwadate, Takehiro, Nihei, Ken-ichi

“…Isotachioside (1) and its related natural product 2 are isolated from Isotachis japonica and Protea neriifolia, respectively, and are categorized as analogs of…”
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Rhododendrol glycosides as stereospecific tyrosinase inhibitors by Iwadate, Takehiro, Nihei, Ken-ichi

“…[Display omitted] Rhododendrol derivatives 3–12 have been synthesized in six steps, including aldol condensation and/or trichloroacetimidate glycosylation as…”
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Inhibitory effects of cardols and related compounds on superoxide anion generation by xanthine oxidase by Masuoka, Noriyoshi, Nihei, Ken-ichi, Maeta, Ayami, Yamagiwa, Yoshiro, Kubo, Isao

“…•Cardols (5-alkylresorcinols) and related compounds were synthesized.•They did not competitively inhibit uric acid formation by xanthine oxidase.•Some of them…”
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Isolation and characterization of FMRFamide-like peptides in the venoms of solitary sphecid wasps by Nihei, Ken-ichi, Peigneur, Steve, Tytgat, Jan, Lange, Angela B., Konno, Katsuhiro

“…•Seven peptide components in the venoms of solitary sphecid wasps, Sphex argentatus argentatus and Isodontia harmandi were isolation and chemical and…”
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Chemical synthesis, redox transformation, and identification of sonnerphenolic C, an antioxidant in Acer nikoense by Iwadate, Takehiro, Nihei, Ken-ichi

“…[Display omitted] Sonnerphenolic C (3), which was predicted in a redox product of epirhododendrin (1) isolated from Acer nikoense, was synthesized for the…”
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Extraction of strawberry leaves with supercritical carbon dioxide and entrainers: Antioxidant capacity, total phenolic content, and inhibitory effect on uric acid production of the extract by Sato, Takafumi, Ikeya, Yoshiro, Adachi, Shin-ichi, Yagasaki, Kazumi, Nihei, Ken-ichi, Itoh, Naotsugu

“…[Display omitted] •Extraction of strawberry leaf was conducted with supercritical CO2 and entrainers.•Ethanol, acetone and water improved the antioxidant…”
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Effect of temperature and pressure on the extraction of strawberry receptacles with a mixture of supercritical carbon dioxide and entrainers by Sato, Takafumi, Fukuda, Fumika, Nihei, Ken-ichi, Itoh, Naotsugu

“…[Display omitted] •Extraction of strawberries was conducted with supercritical CO2 and entrainers.•Ethanol, acetone and water improved the antioxidant…”
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Total synthesis of (−)-ribesin B and its structural revision by Horio, Kae, Nihei, Ken-ichi

“…[Display omitted] A highly symmetric dihydrofuran lignan, ribesin B (1), isolated from the leaves of Ribes nigrum, was synthesized via a process whereby the…”
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Chemical synthesis and tyrosinase inhibitory activity of resorcinol alkyl glucosides, hydroxyalkyl resorcinols, and alkyl resorcinols by Ishioka, Wakana, Nihei, Ken-ichi

“…•Resorcinol alkyl glucosides 7–12 were synthesized to develop tyrosinase inhibitors.•Hydroxyalkyl resorcinols 13–18 and alkyl resorcinols 19–24 were also…”
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Dihydroresveratrol cellobioside and xylobioside as effective melanogenesis activators by Oode, Chisato, Shimada, Wataru, Yokota, Mariko, Yamada, Yoichi, Nihei, Ken-ichi

“…Dihydroresveratrol cellobioside and xylobioside, whose structures were designed based on that of the naturally occurring melanogenesis-controlling agent…”
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Systematic approach to the chemical synthesis of arabidopyrones, the unique α-pyrones of Arabidopsis metabolites by Matsumoto, Takuya, Harima, Saki, Weng, Jing-Ke, Nihei, Ken-ichi

“…Total synthesis of two arabidopyrones, iso-arabidopyl alcohol (1) and iso-arabidopic acid (2) isolated from Arabidopsis thaliana was achieved for the first…”
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Comprehensive Analysis and Biological Characterization of Venom Components from Solitary Scoliid Wasp Campsomeriella annulata annulata by Alberto-Silva, Carlos, Vieira Portaro, Fernanda Calheta, Kodama, Roberto Tadashi, Pantaleão, Halyne Queiroz, Inagaki, Hidetoshi, Nihei, Ken-Ichi, Konno, Katsuhiro

“…Venoms of solitary wasps are utilized for prey capture (insects and spiders), paralyzing them with a stinger injection to be offered as food for their larvae…”
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