World's Best Scientists 2026 revealed!
Mariko Kitajima

Mariko Kitajima

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 42 17535 15862 1389 1258 218 6404

Mariko Kitajima publications per year

The chart shows the history of publications by Mariko Kitajima between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Mariko Kitajima published across 42 years, from 1984 to 2025, averaging 5.8 papers a year. Output peaked at 14 publications in 2008. 9 of the 242 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 14. Peak 14 publications in 2008. 1984: 1 publication 1985: 0 publications 1986: 1 publication 1987: 0 publications 1988: 1 publication 1989: 4 publications 1990: 1 publication 1991: 5 publications 1992: 4 publications 1993: 1 publication 1994: 11 publications 1995: 7 publications 1996: 5 publications 1997: 7 publications 1998: 7 publications 1999: 6 publications 2000: 7 publications 2001: 10 publications 2002: 11 publications 2003: 10 publications 2004: 10 publications 2005: 7 publications 2006: 9 publications 2007: 8 publications 2008: 14 publications 2009: 11 publications 2010: 14 publications 2011: 5 publications 2012: 7 publications 2013: 2 publications 2014: 9 publications 2015: 9 publications 2016: 7 publications 2017: 2 publications 2018: 3 publications 2019: 3 publications 2020: 0 publications 2021: 1 publication 2022: 6 publications 2023: 7 publications 2024: 5 publications 2025: 4 publications
1984 2025

242 publications in total across all disciplines

View publications per year as a table
Mariko Kitajima: publications per year, 1984 to 2025
Year Publications
1984 1
1985 0
1986 1
1987 0
1988 1
1989 4
1990 1
1991 5
1992 4
1993 1
1994 11
1995 7
1996 5
1997 7
1998 7
1999 6
2000 7
2001 10
2002 11
2003 10
2004 10
2005 7
2006 9
2007 8
2008 14
2009 11
2010 14
2011 5
2012 7
2013 2
2014 9
2015 9
2016 7
2017 2
2018 3
2019 3
2020 0
2021 1
2022 6
2023 7
2024 5
2025 4
Total 242
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Mariko Kitajima 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 Mariko Kitajima sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 201–220 publications, is where this scientist sits. 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
61–80 publications 1,295+

This scientist: 218 publications — 39th percentile

39% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281 218
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Mariko Kitajima 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 Mariko Kitajima sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 42–43 D-Index, is where this scientist sits. 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
40–41 D-Index 159+

This scientist: 42 D-Index — 3rd percentile

3% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612 42
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Mariko Kitajima is affiliated with Chiba University in Japan, focusing on research in biochemistry, genetics and molecular biology, chemistry, and pharmacology, toxicology and pharmaceutics. Their work spans several subfields including organic chemistry, pharmacology, molecular biology, biochemistry, and materials chemistry.

The scientist's research primarily covers topics related to alkaloids, particularly their synthesis and pharmacology. Other key areas include traditional and medicinal uses of Annonaceae, chemical synthesis and alkaloids, natural product bioactivities and synthesis, cholinesterase and neurodegenerative diseases, asymmetric synthesis and catalysis, and the synthesis and reactivity of heterocycles.

Frequent coauthors in their publications include Hayato Ishikawa, Jukiya Sakamoto, Hiromitsu Takayama, Shinya Shiomi, and Kenta Rakumitsu.

Kitajima has published extensively in several prestigious journals, with many papers appearing in:

  • Chemistry - A European Journal
  • Chemical and Pharmaceutical Bulletin
  • Organic Letters
  • The Journal of Organic Chemistry
  • Synlett

Selected recent papers include:

  • Asymmetric Total Syntheses of Mitragynine, Speciogynine, and 7-Hydroxymitragynine, 2022, Chemical and Pharmaceutical Bulletin
  • Total Syntheses of (+)-Villocarine A, (−)-Apogeissoschizine, and (+)-Geissoschizine, 2023, Chemistry - A European Journal
  • Divergent Total Syntheses of Hetero-Oligomeric Iridoid Glycosides, 2023, Organic Letters
  • Secorubenine, a Monoterpenoid Indole Alkaloid Glycoside from Adina rubescens: Isolation, Structure Elucidation, and Enantioselective Total Synthesis, 2022, Chemical and Pharmaceutical Bulletin
  • Collective Total Synthesis of β-Carboline-Type Monoterpenoid Indole Alkaloid Glycosides, 2023, Synlett

Best Publications

  • Pteropodine and isopteropodine positively modulate the function of rat muscarinic M1 and 5-HT2 receptors expressed in Xenopus oocyte

    Tai-Hyun Kang;Kinzo Matsumoto;Michihisa Tohda;Yukihisa Murakami

  • Studies on the synthesis and opioid agonistic activities of mitragynine-related indole alkaloids: discovery of opioid agonists structurally different from other opioid ligands.

    Hiromitsu Takayama;Hayato Ishikawa;Mika Kurihara;Mariko Kitajima

  • Rhynchophylline and isorhynchophylline inhibit NMDA receptors expressed in Xenopus oocytes.

    Tai-Hyun Kang;Yukihisa Murakami;Kinzo Matsumoto;Hiromitsu Takayama

  • Antioxidant and cytotoxic flavonoids from the flowers of Melastoma malabathricum L.

    Deny Susanti Deny Susanti;Hasnah Mohd. Sirat;Farediah Ahmad;Rasadah Mat Ali

  • A New Indole Alkaloid, 7 alpha-Hydroxy-7H-mitragynine, from Mitragyna speciosa in Thailand.

    Dhavadee Ponglux;Sumphan Wongseripipatana;Hiromitsu Takayama;Masae Kikuchi

  • Two new tryptamine-derived alkaloids from Chimonanthus praecox f. concolor

    Mariko Kitajima;Ikue Mori;Kazumichi Arai;Noriyuki Kogure

  • Feasible production of camptothecin by hairy root culture of Ophiorrhiza pumila

    K. Saito;H. Sudo;M. Yamazaki;M. Koseki-Nakamura

  • Protective effect of rhynchophylline and isorhynchophylline on in vitro ischemia-induced neuronal damage in the hippocampus: putative neurotransmitter receptors involved in their action

    Tai-Hyun Kang;Yukihisa Murakami;Hiromitsu Takayama;Mariko Kitajima

  • Metabolite profiling of alkaloids and strictosidine synthase activity in camptothecin producing plants.

    Yasuyo Yamazaki;Akiko Urano;Hiroshi Sudo;Mariko Kitajima

  • New type of trimeric and pentameric indole alkaloids from Psychotria rostrata.

    Hiromitsu Takayama;Ikue Mori;Mariko Kitajima;Norio Aimi

  • Prenylated flavonoids and related compounds of the Indonesian Artocarpus (Moraceae)

    Euis H. Hakim;Sjamsul A. Achmad;Lia D. Juliawaty;Lukman Makmur

  • Simultaneous analysis of mitragynine, 7-hydroxymitragynine, and other alkaloids in the psychotropic plant “kratom” ( Mitragyna speciosa ) by LC-ESI-MS

    Ruri Kikura-Hanajiri;Maiko Kawamura;Takuro Maruyama;Mariko Kitajima

  • First total synthesis of trimeric indole alkaloid, psychotrimine.

    Yohei Matsuda;Mariko Kitajima;Hiromitsu Takayama

  • Isolation of gelsedine-type indole alkaloids from Gelsemium elegans and evaluation of the cytotoxic activity of gelsemium alkaloids for A431 epidermoid carcinoma cells.

    Mariko Kitajima;Tomonori Nakamura;Noriyuki Kogure;Mio Ogawa

  • Metabolomics-oriented isolation and structure elucidation of 37 compounds including two anthocyanins from Arabidopsis thaliana.

    Ryo Nakabayashi;Miyako Kusano;Makoto Kobayashi;Takayuki Tohge

  • Involvement of μ-opioid receptors in antinociception and inhibition of gastrointestinal transit induced by 7-hydroxymitragynine, isolated from Thai herbal medicine Mitragyna speciosa

    Kenjiro Matsumoto;Yoshio Hatori;Toshihiko Murayama;Kimihito Tashima

  • Biosynthesis of camptothecin. In silico and in vivo tracer study from [1-13C]glucose

    Yasuyo Yamazaki;Mariko Kitajima;Masanori Arita;Hiromitsu Takayama

  • Lycopodium alkaloids: isolation and asymmetric synthesis.

    Mariko Kitajima;Hiromitsu Takayama

  • Isolation, structure elucidation, and total synthesis of two new Chimonanthus alkaloids, chimonamidine and chimonanthidine

    Hiromitsu Takayama;Yohei Matsuda;Kyohei Masubuchi;Atsushi Ishida

  • Asymmetric Total Synthesis of a Pentacyclic Lycopodium Alkaloid: Huperzine‐Q

    Atsushi Nakayama;Noriyuki Kogure;Mariko Kitajima;Hiromitsu Takayama

  • New lycorine-type alkaloid from Lycoris traubii and evaluation of antitrypanosomal and antimalarial activities of lycorine derivatives.

    Yosuke Toriizuka;Eri Kinoshita;Noriyuki Kogure;Mariko Kitajima

  • Chemical studies on monoterpenoid indole alkaloids from medicinal plant resources Gelsemium and Ophiorrhiza

    Mariko Kitajima

  • Structure reinvestigation of gelsemoxonine, a constituent of Gelsemium elegans, reveals a novel, azetidine-containing indole alkaloid

    Mariko Kitajima;Noriyuki Kogure;Kentaro Yamaguchi;Hiromitsu Takayama

  • First asymmetric total syntheses of cernuane-type Lycopodium alkaloids, cernuine, and cermizine D.

    Yasuhiro Nishikawa;Mariko Kitajima;Hiromitsu Takayama

  • A divergent approach for the total syntheses of cernuane-type and quinolizidine-type Lycopodium alkaloids

    Yasuhiro Nishikawa;Mariko Kitajima;Noriyuki Kogure;Hiromitsu Takayama

  • Four Novel Gelsenicine-Related Oxindole Alkaloids from the Leaves of Gelsemium elegans Benth.†

    Noriyuki Kogure;Naoko Ishii;Mariko Kitajima;Sumphan Wongseripipatana

  • Effects of Uncaria tomentosa total alkaloid and its components on experimental amnesia in mice: elucidation using the passive avoidance test.

    Mohamed A.‐F. Abdel‐Fattah;Kinzo Matsumoto;Keiichi Tabata;Hiromitsu Takayama

  • MGM-9 [(E)-methyl 2-(3-ethyl-7a,12a-(epoxyethanoxy)-9-fluoro-1,2,3,4,6,7,12,12b-octahydro-8-methoxyindolo[2,3-a]quinolizin-2-yl)-3-methoxyacrylate], a derivative of the indole alkaloid mitragynine: A novel dual-acting μ- and κ-opioid agonist with potent antinociceptive and weak rewarding effects in mice

    Kenjiro Matsumoto;Hiromitsu Takayama;Minoru Narita;Atsushi Nakamura

  • Structure characterization, biomimetic total synthesis and optical purity of two new pyrrolidine alkaloids, pandamarilactonine-a and -b, isolated from Pandanus amaryllifolius Roxb

    Hiromitsu Takayama;Tomotake Ichikawa;Toshiyuki Kuwajima;Mariko Kitajima

Frequent Co-Authors

Hiromitsu Takayama
Hiromitsu Takayama Chiba University
Joachim Stöckigt
Joachim Stöckigt Zhejiang University
Kentaro Yamaguchi
Kentaro Yamaguchi Tokushima Bunri University
Hayato Ishikawa
Hayato Ishikawa Kumamoto University
Mami Yamazaki
Mami Yamazaki Chiba University
Kazuei Igarashi
Kazuei Igarashi Chiba University
Keiko Kashiwagi
Keiko Kashiwagi Chiba Institute of Science
Yukihiro Goda
Yukihiro Goda Ministry of Health Labour and Welfare
Scott G. Franzblau
Scott G. Franzblau University of Illinois at Chicago

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