Ray H. Liu

1.0k total citations
45 papers, 790 citations indexed

About

Ray H. Liu is a scholar working on Spectroscopy, Toxicology and Molecular Biology. According to data from OpenAlex, Ray H. Liu has authored 45 papers receiving a total of 790 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Spectroscopy, 22 papers in Toxicology and 16 papers in Molecular Biology. Recurrent topics in Ray H. Liu's work include Forensic Toxicology and Drug Analysis (22 papers), Analytical Chemistry and Chromatography (20 papers) and Mass Spectrometry Techniques and Applications (18 papers). Ray H. Liu is often cited by papers focused on Forensic Toxicology and Drug Analysis (22 papers), Analytical Chemistry and Chromatography (20 papers) and Mass Spectrometry Techniques and Applications (18 papers). Ray H. Liu collaborates with scholars based in Taiwan, United States and Sweden. Ray H. Liu's co-authors include Dongliang Lin, Warren W. Ku, Hsiu‐O Ho, Tsung‐Li Kuo, Edwin G. Piotrowski, Dennis V. Canfield, Wei-Tun Chang, Chih‐Hung Wu, Russell J. Lewis and Michael G. Legendre and has published in prestigious journals such as Analytical Chemistry, Journal of Agricultural and Food Chemistry and Journal of Neurochemistry.

In The Last Decade

Ray H. Liu

44 papers receiving 735 citations

Peers

Ray H. Liu
Francis M. Urry United States
Tatsuo Shinozuka Japan
Amitava Dasgupta United States
Akihiro Nakamoto Japan
Tohru Kojima Japan
Yan Shi China
Camilla Montesano Italy
Daniela Remane Germany
Veniero Gambaro Italy
A. De Leenheer Belgium
Francis M. Urry United States
Ray H. Liu
Citations per year, relative to Ray H. Liu Ray H. Liu (= 1×) peers Francis M. Urry

Countries citing papers authored by Ray H. Liu

Since Specialization
Citations

This map shows the geographic impact of Ray H. Liu'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 Ray H. Liu with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ray H. Liu more than expected).

Fields of papers citing papers by Ray H. Liu

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ray H. Liu. 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 Ray H. Liu. The network helps show where Ray H. Liu may publish in the future.

Co-authorship network of co-authors of Ray H. Liu

This figure shows the co-authorship network connecting the top 25 collaborators of Ray H. Liu. A scholar is included among the top collaborators of Ray H. Liu 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 Ray H. Liu. Ray H. Liu is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Liu, Ray H., et al.. (2017). Simultaneous Quantitation of Methamphetamine, Ketamine, Opiates and their Metabolites in Urine by SPE and LC–MS-MS. Journal of Analytical Toxicology. 41(8). 679–687. 34 indexed citations
2.
Wang, Yushan, et al.. (2012). Methadone concentrations in blood, plasma, and oral fluid determined by isotope-dilution gas chromatography–mass spectrometry. Analytical and Bioanalytical Chemistry. 405(12). 3921–3928. 21 indexed citations
3.
Hambsch, Boris, Mélanie Meyer, Charilaos Avrabos, et al.. (2010). Methylglyoxal‐mediated anxiolysis involves increased protein modification and elevated expression of glyoxalase 1 in the brain. Journal of Neurochemistry. 113(5). 1240–1251. 51 indexed citations
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Wang, Yushan, et al.. (2010). Issues pertaining to the analysis of buprenorphine and its metabolites by gas chromatography–mass spectrometry. Journal of Chromatography A. 1217(10). 1688–1694. 5 indexed citations
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Liu, Ray H., et al.. (2007). Famprofazone as the Source of Methamphetamine and Amphetamine in Urine Specimen Collected During Sport Competition. Journal of Forensic Sciences. 52(2). 479–486. 7 indexed citations
9.
Liu, Ray H., et al.. (2007). Intensity of the Internal Standard Response as the Basis for Reporting a Test Specimen as Negative or Inconclusive. Journal of Analytical Toxicology. 31(9). 549–554. 4 indexed citations
10.
Wu, Chih‐Hung, et al.. (2007). Evaluation of various derivatization approaches for gas chromatography–mass spectrometry analysis of buprenorphine and norbuprenorphine. Journal of Chromatography A. 1182(1). 93–112. 11 indexed citations
11.
Liu, Ray H., et al.. (2007). GC‐MS analysis of multiply derivatized opioids in urine. Journal of Mass Spectrometry. 42(8). 1012–1023. 38 indexed citations
12.
Liu, Ray H., et al.. (2006). Artifacts in the GC–MS profiling of underivatized methamphetamine hydrochloride. Forensic Science International. 162(1-3). 113–120. 17 indexed citations
13.
Lewis, Russell J., et al.. (2005). Enantiomeric determination of ephedrines and norephedrines by chiral derivatization gas chromatography–mass spectrometry approaches. Journal of Chromatography B. 825(1). 88–95. 38 indexed citations
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Liu, Ray H., et al.. (2002). Peer Reviewed: Isotopically Labeled Analogues for Drug Quantitation. Analytical Chemistry. 74(23). 618 A–626 A. 41 indexed citations
17.
Chang, Wei-Tun & Ray H. Liu. (2001). Mechanistic Studies on the Use of 2H- and 13C-Analogues as Internal Standards in Selected Ion Monitoring GC-MS Quantitative Determination—Butalbital Example. Journal of Analytical Toxicology. 25(8). 659–669. 4 indexed citations
18.
Kuo, Tsung‐Li, Dongliang Lin, Ray H. Liu, Fumio Moriya, & Yoshiaki Hashimoto. (2001). Spectra interference between diquat and paraquat by second derivative spectrophotometry. Forensic Science International. 121(1-2). 134–139. 30 indexed citations
19.
Lin, Dongliang, Wei-Tun Chang, Tsung‐Li Kuo, & Ray H. Liu. (2000). Chemical Derivatization and the Selection of Deuterated Internal Standard for Quantitative Determination—Methamphetamine Example*. Journal of Analytical Toxicology. 24(4). 275–280. 16 indexed citations
20.
Liu, Ray H., Michael G. Legendre, Ralph J. Berni, et al.. (1987). Enantiomeric composition analysis of amphetamine and methamphetamine by chiral phase high-performance liquid chromatography-mass spectrometry. Journal of Chromatography A. 398. 239–246. 25 indexed citations

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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