Andreas G. Helfer

874 total citations
20 papers, 679 citations indexed

About

Andreas G. Helfer is a scholar working on Toxicology, Organic Chemistry and Molecular Biology. According to data from OpenAlex, Andreas G. Helfer has authored 20 papers receiving a total of 679 indexed citations (citations by other indexed papers that have themselves been cited), including 6 papers in Toxicology, 3 papers in Organic Chemistry and 3 papers in Molecular Biology. Recurrent topics in Andreas G. Helfer's work include Forensic Toxicology and Drug Analysis (5 papers), Metabolomics and Mass Spectrometry Studies (3 papers) and Analytical Chemistry and Chromatography (3 papers). Andreas G. Helfer is often cited by papers focused on Forensic Toxicology and Drug Analysis (5 papers), Metabolomics and Mass Spectrometry Studies (3 papers) and Analytical Chemistry and Chromatography (3 papers). Andreas G. Helfer collaborates with scholars based in Germany, United Kingdom and France. Andreas G. Helfer's co-authors include Hans H. Maurer, Markus R. Meyer, Julian A. Michely, Armin Weber, Simon D. Brandt, Hannah M. Jahn, Anja Scheller, Frank Kirchhoff, Alexei Verkhratsky and Volker Auwärter and has published in prestigious journals such as Scientific Reports, Journal of Chromatography A and Analytica Chimica Acta.

In The Last Decade

Andreas G. Helfer

19 papers receiving 665 citations

Peers

Countries citing papers authored by Andreas G. Helfer

Since Specialization

Citations

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

Fields of papers citing papers by Andreas G. Helfer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Andreas G. Helfer. 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 Andreas G. Helfer. The network helps show where Andreas G. Helfer may publish in the future.

Co-authorship network of co-authors of Andreas G. Helfer

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work	Indexed citations
1	Refined protocols of tamoxifen injection for inducible DNA recombination in mouse astroglia 2018 ·Scientific Reports ·Hannah M. Jahn, (unknown), Andreas G. Helfer, Julian A. Michely, Alexei Verkhratsky, Hans H. Maurer, Anja Scheller, Frank Kirchhoff	88
2	Liquid chromatography-high resolution-tandem mass spectrometry using Orbitrap technology for comprehensive screening to detect drugs and their metabolites in blood plasma 2017 ·Analytica Chimica Acta ·Andreas G. Helfer, Julian A. Michely, Armin Weber, Markus R. Meyer, Hans H. Maurer	60
3	The effect of renal denervation in moderate treatment-resistant hypertension with confirmed medication adherence 2016 ·Journal of Hypertension ·Christian Ott, Felix Mahfoud, Axel Schmid, Sebastian Ewen, Stefan W. Toennes, Markus R. Meyer, Andreas G. Helfer, Hans H. Maurer, Tilmann Ditting, Roland Veelken, (unknown), Michael Uder, Michael Böhm, Roland E. Schmieder	6
4	LC-HR-MS/MS standard urine screening approach: Pros and cons of automated on-line extraction by turbulent flow chromatography versus dilute-and-shoot and comparison with established urine precipitation 2016 ·Journal of Chromatography B ·Andreas G. Helfer, Julian A. Michely, Armin Weber, Markus R. Meyer, Hans H. Maurer	19
5	Metabolic patterns of JWH‐210, RCS‐4, and THC in pig urine elucidated using LC‐HR‐MS/MS: Do they reflect patterns in humans? 2016 ·Drug Testing and Analysis ·Nadine Schaefer, Andreas G. Helfer, Mattias Kettner, Matthias W. Laschke, (unknown), Andreas H. Ewald, Markus R. Meyer, Michael D. Menger, Hans H. Maurer, Peter H. Schmidt	11
6	Orbitrap technology for comprehensive metabolite-based liquid chromatographic–high resolution-tandem mass spectrometric urine drug screening – Exemplified for cardiovascular drugs 2015 ·Analytica Chimica Acta ·Andreas G. Helfer, Julian A. Michely, Armin Weber, Markus R. Meyer, Hans H. Maurer	114
7	Studies on the metabolism and toxicological detection of the new psychoactive designer drug 2-(4-iodo-2,5-dimethoxyphenyl)-N-[(2-methoxyphenyl)methyl]ethanamine (25I-NBOMe) in human and rat urine using GC-MS, LC-MSn, and LC-HR-MS/MS 2015 ·Analytical and Bioanalytical Chemistry ·(unknown), Andreas G. Helfer, Julian A. Michely, Volker Auwärter, Simon D. Brandt, Markus R. Meyer, Hans H. Maurer	66
8	Blood pressure changes after catheter-based renal denervation are related to reductions in total peripheral resistance 2015 ·Journal of Hypertension ·Sebastian Ewen, Bodo Cremers, Markus R. Meyer, Luca Donazzan, Ingrid Kindermann, Christian Ukena, Andreas G. Helfer, Hans H. Maurer, Ulrich Laufs, Guıdo Grassı, Michael Böhm, Felix Mahfoud	34
9	Blood pressure reductions following catheter-based renal denervation are not related to improvements in adherence to antihypertensive drugs measured by urine/plasma toxicological analysis 2015 ·Clinical Research in Cardiology ·Sebastian Ewen, Markus R. Meyer, Bodo Cremers, Ulrich Laufs, Andreas G. Helfer, Dominik Linz, Ingrid Kindermann, Christian Ukena, Michel Burnier, Stefan Wagenpfeil, Hans H. Maurer, Michael Böhm, Felix Mahfoud	59
10	Metabolism of the new psychoactive substances N,N-diallyltryptamine (DALT) and 5-methoxy-DALT and their detectability in urine by GC–MS, LC–MS n , and LC–HR–MS–MS 2015 ·Analytical and Bioanalytical Chemistry ·Julian A. Michely, Andreas G. Helfer, Simon D. Brandt, Markus R. Meyer, Hans H. Maurer	41
11	No‐carrier‐added labeling of the neuroprotective Ebselen with selenium‐73 and selenium‐75 2015 ·Journal of Labelled Compounds and Radiopharmaceuticals ·Andreas G. Helfer, Johannes Ermert, (unknown), Heinz H. Coenen	4
12	Acute combined poisoning with the new designer drug 4-methyl-N-ethyl-cathinone (4-MEC) and gammabutyrolactone (GBL): A case report with different analytical approaches for identification of some metabolites 2014 ·Annales de Toxicologie Analytique ·Alain Turcant, D. Boels, Andreas G. Helfer, (unknown), Marie Deguigne, Bénédicte Lelièvre, Markus R. Meyer, Hans H. Maurer	8
13	Current Position of High-Resolution MS for Drug Quantification in Clinical & Forensic Toxicology 2014 ·Bioanalysis ·Markus R. Meyer, Andreas G. Helfer, Hans H. Maurer	37
14	Elucidation of the metabolites of the novel psychoactive substance 4‐methyl‐N‐ethyl‐cathinone (4‐MEC) in human urine and pooled liver microsomes by GC‐MS and LC‐HR‐MS/MS techniques and of its detectability by GC‐MS or LC‐MSⁿ standard screening approaches 2014 ·Drug Testing and Analysis ·Andreas G. Helfer, Alain Turcant, D. Boels, (unknown), Bénédicte Lelièvre, Jessica Welter, Markus R. Meyer, Hans H. Maurer	41
15	Direct analysis of the mushroom poisons α- and β-amanitin in human urine using a novel on-line turbulent flow chromatography mode coupled to liquid chromatography–high resolution-mass spectrometry/mass spectrometry 2013 ·Journal of Chromatography A ·Andreas G. Helfer, Markus R. Meyer, Julian A. Michely, Hans H. Maurer	44
16	Bis(4-benzyloxyphenyl)iodonium salts as effective precursors for the no-carrier-added radiosynthesis of 4-[18F]fluorophenol 2013 ·Applied Radiation and Isotopes ·Andreas G. Helfer, (unknown), Johannes Ermert, Angelo Infantino, Heinz H. Coenen	8
17	Carrier‐effect on palladium‐catalyzed, nucleophilic ¹⁸F‐fluorination of aryl triflates 2012 ·Journal of Labelled Compounds and Radiopharmaceuticals ·Jens Cardinale, Johannes Ermert, (unknown), Andreas G. Helfer, Marie Brandt, Heinz H. Coenen	18
18	Chemistry and Pharmacology of Neglected Helminthic Diseases 2011 ·Current Medicinal Chemistry ·(unknown), Andreas G. Helfer, David Kotlyar, James Trevor Oswald, Thomas Efferth	17
19	Two New Botrydial Derivatives fromHymenoscyphus epiphyllusand their Biological Activities 1991 ·Planta Medica ·Heidrun Anke, Andreas G. Helfer, (unknown), (unknown), Wölfgang Steglich	1
20	Geschichte der Wirtschaftspolitik in Osteuropa 1987 ·Włodzimierz Brus, (unknown), Andreas G. Helfer	3

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.

Explore authors with similar magnitude of impact