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Fumitoshi Hirayama

Fumitoshi Hirayama

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 63 8371 7604 565 528 314 15093

Fumitoshi Hirayama publications per year

The chart shows the history of publications by Fumitoshi Hirayama between 1974 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Fumitoshi Hirayama published across 52 years, from 1974 to 2025, averaging 6.3 papers a year. Output peaked at 19 publications in 2006. 4 of the 326 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1974 to 2025. Vertical axis: number of publications, 0 to 19. Peak 19 publications in 2006. 1974: 1 publication 1975: 0 publications 1976: 0 publications 1977: 1 publication 1978: 11 publications 1979: 6 publications 1980: 7 publications 1981: 4 publications 1982: 8 publications 1983: 9 publications 1984: 13 publications 1985: 5 publications 1986: 3 publications 1987: 5 publications 1988: 8 publications 1989: 7 publications 1990: 6 publications 1991: 4 publications 1992: 6 publications 1993: 8 publications 1994: 3 publications 1995: 4 publications 1996: 9 publications 1997: 3 publications 1998: 4 publications 1999: 17 publications 2000: 7 publications 2001: 14 publications 2002: 12 publications 2003: 4 publications 2004: 6 publications 2005: 5 publications 2006: 19 publications 2007: 3 publications 2008: 7 publications 2009: 8 publications 2010: 6 publications 2011: 17 publications 2012: 7 publications 2013: 1 publication 2014: 7 publications 2015: 8 publications 2016: 8 publications 2017: 5 publications 2018: 6 publications 2019: 7 publications 2020: 5 publications 2021: 5 publications 2022: 2 publications 2023: 1 publication 2024: 2 publications 2025: 2 publications
1974 2025

326 publications in total across all disciplines

View publications per year as a table
Fumitoshi Hirayama: publications per year, 1974 to 2025
Year Publications
1974 1
1975 0
1976 0
1977 1
1978 11
1979 6
1980 7
1981 4
1982 8
1983 9
1984 13
1985 5
1986 3
1987 5
1988 8
1989 7
1990 6
1991 4
1992 6
1993 8
1994 3
1995 4
1996 9
1997 3
1998 4
1999 17
2000 7
2001 14
2002 12
2003 4
2004 6
2005 5
2006 19
2007 3
2008 7
2009 8
2010 6
2011 17
2012 7
2013 1
2014 7
2015 8
2016 8
2017 5
2018 6
2019 7
2020 5
2021 5
2022 2
2023 1
2024 2
2025 2
Total 326
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Fumitoshi Hirayama 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 Fumitoshi Hirayama 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, 301–320 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: 314 publications — 66th percentile

66% 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
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764 314
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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Fumitoshi Hirayama 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 Fumitoshi Hirayama 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, 62–63 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: 63 D-Index — 54th percentile

54% 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
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 63
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

Fumitoshi Hirayama is a researcher affiliated with Sojo University in Japan, with a focus on biochemistry, genetics, molecular biology, and medicine. Their work spans several subfields including molecular biology, pharmaceutical science, organic chemistry, materials chemistry, and nutrition and dietetics. The research topics frequently addressed in their publications include drug solubility and delivery systems, biochemical analysis and sensing techniques, protein purification and stability, therapeutic uses of natural elements, biocrusts and microbial ecology, metabolism and genetic disorders, as well as child nutrition and feeding issues.

Hirayama has contributed to various peer-reviewed journals, with publications in venues such as:

  • Carbohydrate Polymers
  • International Journal of Biological Macromolecules
  • Life Sciences
  • Pharmaceutics
  • Journal of Pharmacy and Pharmacology

Notable recent papers include:

  • "Effects of surface-deacetylated chitin nanofibers on non-alcoholic steatohepatitis model rats and their gut microbiota," 2020, International Journal of Biological Macromolecules
  • "Polypseudorotaxane-based supramolecular hydrogels consisting of cyclodextrins and Pluronics as stabilizing agents for antibody drugs," 2020, Carbohydrate Polymers
  • "Sacran, a sulfated polysaccharide, suppresses the absorption of lipids and modulates the intestinal flora in non-alcoholic steatohepatitis model rats," 2021, Life Sciences
  • "Development of α-Cyclodextrin-Based Orally Disintegrating Tablets for 4-Phenylbutyrate," 2024, Pharmaceutics
  • "Study of the inclusion complexes formed between 4-phenylbutyrate and α-, β- and γ-cyclodextrin in solution and evaluation on their taste-masking properties," 2022, Journal of Pharmacy and Pharmacology

The research collaborations of Hirayama are reflected in frequent partnerships with co-authors such as Daisuke Iohara, Masaki Otagiri, Makoto Anraku, Keishi Yamasaki, and Akihiro Michihara.

This body of work illustrates a comprehensive approach to addressing biochemical and therapeutic challenges, with attention to drug delivery, molecular stability, and metabolic health conditions, contributing across multiple related disciplines.

Best Publications

  • Cyclodextrin Drug Carrier Systems.

    Kaneto Uekama;Fumitoshi Hirayama;Tetsumi Irie

  • Cyclodextrin-based controlled drug release system.

    F Hirayama;K Uekama

  • Enhancement of gene expression by polyamidoamine dendrimer conjugates with alpha-, beta-, and gamma-cyclodextrins.

    Hidetoshi Arima;Fumihiro Kihara;Fumitoshi Hirayama;Kaneto Uekama

  • Inclusi on complexations of steroid hormones with cyclodextrins in water and in solid phase

    K Uekama;T Fujinaga;F Hirayama;M Otagiri

  • In vitro and in vivo gene transfer by an optimized α-cyclodextrin conjugate with polyamidoamine dendrimer

    Fumihiro Kihara;Hidetoshi Arima;Toshihito Tsutsumi;Fumitoshi Hirayama

  • Colon-specific delivery of prednisolone-appended α-cyclodextrin conjugate : Alleviation of systemic side effect after oral administration

    Hideki Yano;Fumitoshi Hirayama;Makoto Kamada;Hidetoshi Arima

  • Effects of structure of polyamidoamine dendrimer on gene transfer efficiency of the dendrimer conjugate with α-cyclodextrin

    Fumihiro Kihara;Hidetoshi Arima;Toshihito Tsutsumi;Fumitoshi Hirayama

  • Improvement of gene delivery mediated by mannosylated dendrimer/α-cyclodextrin conjugates

    Koki Wada;Hidetoshi Arima;Toshihito Tsutsumi;Yuko Chihara

  • Comparative studies of the enhancing effects of cyclodextrins on the solubility and oral bioavailability of tacrolimus in rats.

    Hidetoshi Arima;Kiyokazu Yunomae;Kouzou Miyake;Tetsumi Irie

  • Antioxidant activities of chitosans and its derivatives in in vitro and in vivo studies.

    Makoto Anraku;Janusz M. Gebicki;Daisuke Iohara;Hisao Tomida

  • Evaluation of polyamidoamine dendrimer/α-cyclodextrin conjugate (generation 3, G3) as a novel carrier for small interfering RNA (siRNA)

    Toshihito Tsutsumi;Fumitoshi Hirayama;Kaneto Uekama;Hidetoshi Arima

  • Improvement of Solubility and Oral Bioavailability of Rutin by Complexation with 2-Hydroxypropyl-β-cyclodextrin

    Kouzou Miyake;Hidetoshi Arima;Fumitoshi Hirayama;Masanobu Yamamoto

  • Determination of the Stability Constants for Inclusion Complexes of Cyclodextrins with Various Drug Molecules by High Performance Liquid Chromatography

    Kaneto Uekama;Fumitoshi Hirayama;Shouzo Nasu;Naoki Matsuo

  • Colon-Specific Drug Delivery Based on a Cyclodextrin Prodrug: Release Behavior of Biphenylylacetic Acid from Its Cyclodextrin Conjugates in Rat Intestinal Tracts after Oral Administration

    Kunihiro Minami;Fumitoshi Hirayama;Kaneto Uekama

  • Contribution of P-glycoprotein to the enhancing effects of dimethyl-beta-cyclodextrin on oral bioavailability of tacrolimus.

    Hidetoshi Arima;Kiyokazu Yunomae;Fumitoshi Hirayama;Kaneto Uekama

  • Studies on the Antitumor Bisabolane Sesquiterpenoids Isolated from Curcuma xanthorrhiza

    Hideji Itokawa;Fusayoshi Hirayama;Kazuko Funakoshi;Koichi Takeya

  • Improvement of the oral bioavailability of digitalis glycosides by cyclodextrin complexation.

    Kaneto Uekama;Toshio Fujinaga;Fumitoshi Hirayama;Masaki Otagiri

  • Improvement of dissolution and absorption characteristics of benzodiazepines by cyclodextrin complexation

    K. Uekama;S. Narisawa;F. Hirayama;M. Otagiri

  • 6A-O-[(4-Biphenylyl)acetyl]-α-, -β-, and -γ-cyclodextrins and 6A-deoxy-6A-[[(4-biphenylyl)acetyl]amino] -α-, -β-, and -γ-cyclodextrins : Potential prodrugs for colon-specific delivery

    Kaneto Uekama;Kunihiro Minami;Fumitoshi Hirayama

  • Enhancement of oral bioavailability of coenzyme Q10 by complexation with γ-cyclodextrin in healthy adults

    Keiji Terao;Daisuke Nakata;Hiroshi Fukumi;Gerhard Schmid

  • In Vitro and In Vivo gene delivery mediated by Lactosylated Dendrimer/α-Cyclodextrin Conjugates (G2) into Hepatocytes

    Hidetoshi Arima;Shogo Yamashita;Yoshimasa Mori;Yuya Hayashi

Frequent Co-Authors

Kaneto Uekama
Kaneto Uekama Sojo University
Hidetoshi Arima
Hidetoshi Arima Kumamoto University
Masaki Otagiri
Masaki Otagiri Sojo University
Toru Maruyama
Toru Maruyama Kumamoto University
Wolfram Saenger
Wolfram Saenger Freie Universität Berlin
Janusz M. Gebicki
Janusz M. Gebicki Macquarie University
Jun Li
Jun Li National University of Singapore
Kensuke Miyake
Kensuke Miyake Tokyo University of Science
Hideomi Koinuma
Hideomi Koinuma Tokyo Institute of Technology
George M. Sheldrick
George M. Sheldrick University of Göttingen

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