Hisao Oka

5.8k total citations
166 papers, 5.0k citations indexed

About

Hisao Oka is a scholar working on Analytical Chemistry, Spectroscopy and Molecular Biology. According to data from OpenAlex, Hisao Oka has authored 166 papers receiving a total of 5.0k indexed citations (citations by other indexed papers that have themselves been cited), including 79 papers in Analytical Chemistry, 41 papers in Spectroscopy and 38 papers in Molecular Biology. Recurrent topics in Hisao Oka's work include Chromatography in Natural Products (41 papers), Analytical Chemistry and Chromatography (33 papers) and Pesticide Residue Analysis and Safety (24 papers). Hisao Oka is often cited by papers focused on Chromatography in Natural Products (41 papers), Analytical Chemistry and Chromatography (33 papers) and Pesticide Residue Analysis and Safety (24 papers). Hisao Oka collaborates with scholars based in Japan, United States and Czechia. Hisao Oka's co-authors include Yoshitomo Ikai, Ken‐ichi Harada, Yuko Ito, Makoto Suzuki, Kiyonaga Fujii, Hiroshi Matsumoto, Yoichiro Ito, Kenichi Harada, Makoto Suzuki and Hiroyuki Nakazawa and has published in prestigious journals such as The Journal of Experimental Medicine, SHILAP Revista de lepidopterología and Analytical Chemistry.

In The Last Decade

Hisao Oka

163 papers receiving 4.7k citations

Peers

Countries citing papers authored by Hisao Oka

Since Specialization

Citations

This map shows the geographic impact of Hisao Oka's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hisao Oka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hisao Oka more than expected).

Fields of papers citing papers by Hisao Oka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hisao Oka. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hisao Oka. The network helps show where Hisao Oka may publish in the future.

Co-authorship network of co-authors of Hisao Oka

This figure shows the co-authorship network connecting the top 25 collaborators of Hisao Oka. A scholar is included among the top collaborators of Hisao Oka based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hisao Oka. Hisao Oka is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Efficiency of Sea Pandan Leaves (Pandanus tectorius) in the Biosorption of Mercury (Hg) in Coastal Areas 2024 ·SHILAP Revista de lepidopterología ·(unknown), (unknown), Hilfi Pardi, Hisao Oka	2
2	Treatment experience of artificial muscle type dynamic splint for patients with chronic nature of wrist joint contractures 2021 ·Zenodo (CERN European Organization for Nuclear Research) ·Jun‐ichi Nakayama, Kazunori Ogawa, Hisao Oka, (unknown)	0
3	Preparative purification of gentamicin components using high‐speed counter‐current chromatography coupled with electrospray mass spectrometry 2011 ·Journal of Separation Science ·Kōichi Inoue, (unknown), Masakazu Horie, Tomoaki Hino, Hisao Oka	10
4	Efficient purification of xanthomonasin A and B from Monascus yellow colorant by high-speed countercurrent chromatography 2010 ·Kōichi Inoue, Yuka Ito, (unknown), Kaname Tsutsumiuchi, (unknown), Tomoaki Hino, Hisao Oka	3
5	LC/ESI-MS/MS Method for the Simultaneous Determination of Macrocyclic Lactone Parasiticides in Livestock Products and Fish 2010 ·Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) ·Kōichi Inoue, (unknown), Tomoaki Hino, Hisao Oka	5
6	Determination of Phthalates in Diet and Bedding for Experimental Animals Using Gas Chromatography-Mass Spectrometry 2009 ·Bulletin of Environmental Contamination and Toxicology ·Fumio Kondo, Masanao Okumura, Hisao Oka, Hiroyuki Nakazawa, Shun‐ichiro Izumi, Tsunehisa Makino	9
7	Application of dual counter-current chromatography for rapid sample preparation of N-methylcarbamate pesticides in vegetable oil and citrus fruit 2006 ·Journal of Chromatography A ·Yuko Ito, Tomomi Goto, SADAJI YAMADA, Hiroshi Matsumoto, Hisao Oka, Nobuyuki Takahashi, Hiroyuki Nakazawa, Hisamitsu Nagase, Yoichiro Ito	27
8	Analysis of Plasticizer Phthalate and Adipate Esters in Stationeries, Cosmetics, and Household Commodities by GC and GC/MS 2004 ·Hisao Oka, Yuko Ito, Tomomi Goto, Yoshitomo Ikai, Fumio Kondo, Hiroshi Matsumoto, Tsunehisa Makino, Hiroyuki Nakazawa	3
9	Application of ion-exchange cartridge clean-up in food analysis 2004 ·Journal of Chromatography A ·Yuko Ito, Tomomi Goto, Hisao Oka, Hiroshi Matsumoto, Kazue Takeba	21
10	Determination of Benzimidazole Anthelmintics in Livestock Foods by HPLC 2003 ·Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) ·Kazue Takeba, (unknown), (unknown), (unknown), Hisao Oka, Yuko Ito, Hiroyuki Nakazawa	2
11	2001 ·Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) ·Hisao Oka, (unknown), (unknown)	7
12	Analysis of Turmeric Oleoresin, Gardenia Yellow, and Annatto Extract in Foods Using Reversed-phase Thin-layer Chromatography/Scanning Densitometry. 2000 ·Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) ·(unknown), Eiji Ueno, Yuko Ito, Hisao Oka, Tomoko Hayashi, (unknown), SADAJI YAMADA, Hiroshi Matsumoto, Toru Ito, Takashi Maruyama, (unknown), (unknown)	8
13	Separation of antibiotics by counter-current chromatography 1998 ·Journal of Chromatography A ·Hisao Oka, Ken‐ichi Harada, Yuko Ito, Yoichiro Ito	73
14	Isolation of bacitracins A and F by high-speed counter-current chromatography 1991 ·Journal of Chromatography A ·Ken‐ichi Harada, Yoshitomo Ikai, Yumiko Yamazaki, Hisao Oka, Makoto Suzuki, Hiroyuki Nakazawa, Yoichiro Ito	21
15	Systematic search for suitable two-phase solvent systems for high-speed counter-current chromatography 1991 ·Journal of Chromatography A ·(unknown), Hisao Oka, Yoichiro Ito	152
16	Improved high-speed counter-current chromatograph with three multilayer coils connected in series 1989 ·Journal of Chromatography A ·Yoichiro Ito, Hisao Oka, (unknown)	28
17	Improved cross-axis synchronous flow-through coil planet centrifuge for performing counter-current chromatography 1989 ·Journal of Chromatography A ·Yoichiro Ito, Hisao Oka, (unknown)	22
18	Improvement of chemical analysis of antibiotics 1989 ·Journal of Chromatography A ·Hisao Oka, Yoshitomo Ikai, Norihisa Kawamura, Masuo Yamada, Ken‐ichi Harada, Yumiko Yamazaki, Makoto Suzuki	48
19	Horizontal flow-through coil planet centrifuge equipped with a set of multilayer coils around the column holder 1988 ·Journal of Chromatography A ·(unknown), Hisao Oka	25
20	HUNDRED DAY LEUKEMIA: PREFERENTIAL INDUCTION IN RAT BY PULSE-DOSES OF 7,8,12-TRIMETHYLBENZ(A)ANTHRACENE 1970 ·The Journal of Experimental Medicine ·Charles Huggins, LORRAINE C. GRAND, Hisao Oka	28

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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