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Chemistry
Japan
2026

D-Index & Metrics

Chemistry

D-Index
97
Citations
35235
World Ranking
1462
National Ranking
67

Etsuo Niki publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Etsuo Niki sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 416 publications — 82nd percentile

82% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Etsuo Niki D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Etsuo Niki sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 97 D-Index — 92nd percentile

92% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Chemistry in Japan Leader Award
  • 2025 - Research.com Chemistry in Japan Leader Award
  • 2022 - Research.com Chemistry in Japan Leader Award

Overview

Etsuo Niki is affiliated with the University of Tokyo in Japan and conducts research predominantly in the intersecting fields of Medicine, Chemistry, and Biochemistry, Genetics and Molecular Biology. Their work focuses primarily on areas such as Free Radicals and Antioxidants, Antioxidant Activity and Oxidative Stress, and Vitamin C and Antioxidants Research, with additional contributions to Sulfur Compounds in Biology, Redox Biology and Oxidative Stress, Cholesterol and Lipid Metabolism, and Phytochemicals and Antioxidant Activities.

The primary publication venues for this scientist include Free Radical Biology and Medicine, Free Radical Research, Antioxidants and Redox Signaling, Biochemical and Biophysical Research Communications, and Journal of Berry Research. These journals reflect a concentration in biochemical and oxidative stress research.

Among recent scholarly publications are:

  • Lipid oxidation that is, and is not, inhibited by vitamin E: Consideration about physiological functions of vitamin E, 2021, Free Radical Biology and Medicine
  • Antioxidant action of vitamin Ein vivo as assessed from its reaction products with multiple biological oxidants, 2020, Free Radical Research
  • Actions of Thiols, Persulfides, and Polysulfides as Free Radical Scavenging Antioxidants, 2023, Antioxidants and Redox Signaling
  • Antioxidant action of persulfides and polysulfides against free radical-mediated lipid peroxidation, 2022, Free Radical Research
  • Cholesterol is more readily oxidized than phospholipid linoleates in cell membranes to produce cholesterol hydroperoxides, 2023, Free Radical Biology and Medicine

Frequent collaborators in research include Noriko Noguchi, Yoshiro Saito, Takayuki Kaneko, Yuichiro Mita, and Kanako Nozawa-Kumada. This network suggests a collaborative approach in biochemical and antioxidant research.

Their work demonstrates an emphasis on biochemical mechanisms behind antioxidant activity, particularly the behavior of vitamin E and sulfur-containing compounds in oxidative stress. Research output further addresses lipid metabolism and the complex biochemical interactions of free radicals within biological systems, as indicated by the topics and the specificity of publications.

Best Publications

  • Lipid peroxidation: mechanisms, inhibition, and biological effects.

    Etsuo Niki;Yasukazu Yoshida;Yoshiro Saito;Noriko Noguchi

  • Lipid peroxidation: physiological levels and dual biological effects.

    Unknown

  • Antioxidants in relation to lipid peroxidation

    Etsuo Niki

  • Assessment of antioxidant capacity in vitro and in vivo.

    Unknown

  • Protein-bound acrolein: Potential markers for oxidative stress

    Koji Uchida;Masamichi Kanematsu;Kensuke Sakai;Tsukasa Matsuda

  • Free radical initiators as source of water- or lipid-soluble peroxyl radicals.

    Etsuo Niki

  • Inhibition of oxidation of methyl linoleate in solution by vitamin E and vitamin C.

    E Niki;T Saito;A Kawakami;Y Kamiya

  • Acrolein Is a Product of Lipid Peroxidation Reaction: FORMATION OF FREE ACROLEIN AND ITS CONJUGATE WITH LYSINE RESIDUES IN OXIDIZED LOW DENSITY LIPOPROTEINS *

    Koji Uchida;Masamichi Kanematsu;Yasujiro Morimitsu;Toshihiko Osawa

  • Role of vitamin E as a lipid-soluble peroxyl radical scavenger: in vitro and in vivo evidence.

    Unknown

  • Action of ascorbic acid as a scavenger of active and stable oxygen radicals.

    Etsuo Niki

  • Interaction among vitamin C, vitamin E, and beta-carotene.

    Etsuo Niki;Noriko Noguchi;Hidevasu Tsuchihashi;Naohiro Gotoh

  • Interaction of ascorbate and alpha-tocopherol.

    Etsuo Niki

  • Free-radical chain oxidation of rat red blood cells by molecular oxygen and its inhibition by α-tocopherol

    Masayuki Miki;Hiroshi Tamai;Makoto Mino;Yorihiro Yamamoto

  • Free radical-mediated chain oxidation of low density lipoprotein and its synergistic inhibition by vitamin E and vitamin C.

    Keizo Sato;Etsuo Niki;Hiroyuki Shimasaki

  • Comparative study on the action of tocopherols and tocotrienols as antioxidant: chemical and physical effects.

    Yasukazu Yoshida;Etsuo Niki;Noriko Noguchi

  • A comparison of screening methods for antioxidant activity in seaweeds

    R. Matsukawa;Z. Dubinsky;E. Kishimoto;K. Masaki

  • REGENERATION OF VITAMIN E FROM α-CHROMANOXYL RADICAL BY GLUTATHIONE AND VITAMIN C

    Etsuo Niki;Jyunichi Tsuchiya;Ritsuko Tanimura;Yoshio Kamiya

  • Antioxidant effects of phytosterol and its components.

    Yasukazu Yoshida;Etsuo Niki

  • Dynamics of antioxidant action of vitamin E.

    Etsijo Niki;Noriko Noguchi

  • Protein Adsorption of Ultrafine Metal Oxide and Its Influence on Cytotoxicity toward Cultured Cells

    Masanori Horie;Keiko Nishio;Katsuhide Fujita;Shigehisa Endoh

  • Oxidative hemolysis of erythrocytes and its inhibition by free radical scavengers.

    E Niki;E Komuro;M Takahashi;S Urano

  • Cell death caused by selenium deficiency and protective effect of antioxidants

    Yoshiro Saito;Yasukazu Yoshida;Takashi Akazawa;Kazuhiko Takahashi

  • A novel fluorescent probe diphenyl‐1‐pyrenylphosphine to follow lipid peroxidation in cell membranes

    Yuko Okimoto;Akira Watanabe;Etsuo Niki;Takashi Yamashita

Frequent Co-Authors

Noriko Noguchi
Noriko Noguchi Doshisha University
Yasukazu Yoshida
Yasukazu Yoshida National Institute of Advanced Industrial Science and Technology
Tatsuhiko Kodama
Tatsuhiko Kodama University of Tokyo
Hitoshi Iwahashi
Hitoshi Iwahashi Gifu University
Koji Uchida
Koji Uchida University of Tokyo
Xian-Yong Wei
Xian-Yong Wei China University of Mining and Technology
Takao Hamakubo
Takao Hamakubo Nippon Medical School
Motohiro Takeya
Motohiro Takeya Kumamoto Health Science University
Akira Watanabe
Akira Watanabe Kyoto University
Yoshiro Saito
Yoshiro Saito Tohoku University

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