Helmut Sapper

417 total citations
21 papers, 366 citations indexed

About

Helmut Sapper is a scholar working on Spectroscopy, Molecular Biology and Physical and Theoretical Chemistry. According to data from OpenAlex, Helmut Sapper has authored 21 papers receiving a total of 366 indexed citations (citations by other indexed papers that have themselves been cited), including 7 papers in Spectroscopy, 5 papers in Molecular Biology and 5 papers in Physical and Theoretical Chemistry. Recurrent topics in Helmut Sapper's work include Analytical Chemistry and Chromatography (4 papers), Crystallography and molecular interactions (4 papers) and Vitamin C and Antioxidants Research (4 papers). Helmut Sapper is often cited by papers focused on Analytical Chemistry and Chromatography (4 papers), Crystallography and molecular interactions (4 papers) and Vitamin C and Antioxidants Research (4 papers). Helmut Sapper collaborates with scholars based in Germany, Czechia and Canada. Helmut Sapper's co-authors include David G. Cameron, Henry H. Mantsch, W. Lohmann, W. Lohmann, W. Schimmack, Sa‐Ouk Kang, Hans‐Otto Kalinowski and Michael Matthies and has published in prestigious journals such as Chemical Physics Letters, Biochemical Pharmacology and Molecular Pharmacology.

In The Last Decade

Helmut Sapper

21 papers receiving 346 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Helmut Sapper Germany 9 168 130 79 51 45 21 366
Birgitta Dahlén Sweden 12 256 1.5× 284 2.2× 132 1.7× 80 1.6× 38 0.8× 27 656
G. Bech Nielsen Denmark 11 76 0.5× 168 1.3× 87 1.1× 50 1.0× 51 1.1× 24 429
Susan R. Fahrenholtz United States 11 102 0.6× 235 1.8× 89 1.1× 40 0.8× 15 0.3× 18 522
Elisabeth Sjöstrand United States 11 73 0.4× 229 1.8× 45 0.6× 49 1.0× 15 0.3× 34 424
P. A. S. SMITH 4 105 0.6× 228 1.8× 60 0.8× 45 0.9× 14 0.3× 5 402
Kazumitsu Naoe Japan 16 226 1.3× 161 1.2× 134 1.7× 75 1.5× 14 0.3× 34 454
A.‐B. Hörnfeldt Sweden 15 101 0.6× 227 1.7× 33 0.4× 68 1.3× 14 0.3× 21 451
Lloyd N. Ferguson United States 11 52 0.3× 176 1.4× 66 0.8× 87 1.7× 42 0.9× 36 373
M.B. Sierra Argentina 11 210 1.3× 181 1.4× 60 0.8× 51 1.0× 65 1.4× 16 437
Harold A. Fiess United States 7 142 0.8× 60 0.5× 68 0.9× 70 1.4× 24 0.5× 8 349

Countries citing papers authored by Helmut Sapper

Since Specialization
Citations

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

Fields of papers citing papers by Helmut Sapper

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Helmut Sapper. 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 Helmut Sapper. The network helps show where Helmut Sapper may publish in the future.

Co-authorship network of co-authors of Helmut Sapper

This figure shows the co-authorship network connecting the top 25 collaborators of Helmut Sapper. A scholar is included among the top collaborators of Helmut Sapper 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 Helmut Sapper. Helmut Sapper 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.
Sapper, Helmut, et al.. (1985). The diffusion of L(+)-ascorbic acid across DPPC vesicle membranes. Journal of Microencapsulation. 2(1). 23–30. 6 indexed citations
2.
Sapper, Helmut, et al.. (1985). 1H NMR red-ox titration of copper(II)-histidine and -oligopeptide complexes with L(+)-ascorbic acid. Inorganica Chimica Acta. 106(1). 25–29. 5 indexed citations
3.
Sapper, Helmut, et al.. (1984). The Influence of Amino Acid Ligands and Vitamin C on the Reduction Potential of Fe(III): Polarographie and Electron Spin Resonance Investigations. Zeitschrift für Naturforschung C. 39(1-2). 102–106. 3 indexed citations
4.
Lohmann, W., et al.. (1984). 1H- and 13C-NMR spectra of ascorbate and isoascorbate. Die Naturwissenschaften. 71(9). 477–478. 2 indexed citations
5.
Sapper, Helmut, et al.. (1983). Carbon‐13 NMR spectra of 1,4‐benzodiazepines—influence of the 7‐substituent. Organic Magnetic Resonance. 21(5). 319–321. 3 indexed citations
6.
7.
Sapper, Helmut. (1982). The reversibility of the vitamin C redox system : electrochemical reasons and biological aspects. Medical Entomology and Zoology. 37. 942–946. 11 indexed citations
8.
Sapper, Helmut, et al.. (1982). Analysis and applications of 13C NMR lanthanide induced shifts of 1,4‐benzodiazepines. Organic Magnetic Resonance. 19(1). 49–53. 8 indexed citations
9.
Sapper, Helmut, et al.. (1982). The Reversibility of the Vitamin C Redox System: Electrochemical Reasons and Biological Aspects. Zeitschrift für Naturforschung C. 37(10). 942–946. 54 indexed citations
10.
Kang, Sa‐Ouk, et al.. (1982). The Oxidative Degradation of ʟ-Ascorbic Acid via an α-Ketoaldehyde. Zeitschrift für Naturforschung C. 37(11-12). 1064–1069. 22 indexed citations
11.
Sapper, Helmut, David G. Cameron, & Henry H. Mantsch. (1981). The thermotropic phase behavior of ascorbyl palmitate: an infrared spectroscopic study. Canadian Journal of Chemistry. 59(16). 2543–2549. 158 indexed citations
12.
Sapper, Helmut, et al.. (1980). 1H-NMR investigations of a hammet-type substituent effect on the hydrogen bond interaction of some 1,4-benzodiazepines. Biochemical Pharmacology. 29(2). 137–140. 7 indexed citations
13.
14.
Sapper, Helmut, et al.. (1979). 1H-NMR and IR investigations on the amine-phosphate interaction in catecholamine-ATP complexes.. PubMed. 25(4). 263–8. 2 indexed citations
15.
Matthies, Michael & Helmut Sapper. (1979). Proton-transfer effect in hydrogen-bonded complexes of phospho-diester groups with amines in non-aqueous solvents. Chemical Physics Letters. 68(1). 61–64. 3 indexed citations
16.
Sapper, Helmut, et al.. (1978). 1H -NMRInvestigations on the Hydrogen Bond Formation between the Tranquilizers Diazepam and Nitrazepam and Some Nucleobases. Zeitschrift für Naturforschung C. 33(11-12). 870–875. 8 indexed citations
17.
Sapper, Helmut & W. Lohmann. (1978). Stacking interaction of nucleobases: NMR investigations. European Biophysics Journal. 4(4). 327–335. 23 indexed citations
18.
Sapper, Helmut & W. Lohmann. (1978). Association of some psychotomimetic compounds with 6-methylpurine in aqueous solutions. Biochemical Pharmacology. 27(4). 595–599. 2 indexed citations
19.
Sapper, Helmut & W. Lohmann. (1976). Self-association and Binding Sites of Some Psychotomimetic Tryptamine Derivatives and Related Compounds: Nuclear Magnetic Resonance Investigations. Molecular Pharmacology. 12(4). 605–611. 4 indexed citations
20.
Schimmack, W., Helmut Sapper, & W. Lohmann. (1975). Stacking interactions of nucleobases: NMR-Investigations II. Selfassociation of purine- and pyrimidine-derivatives. European Biophysics Journal. 1(4). 311–318. 14 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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