Professor Mathias Schäfer FRSC
Mathias Schäfer studierte Chemie in Köln, promovierte 1998 bei Herbert Budzikiewicz und wurde für seine Promotionsarbeit mit dem Kurt-Alder-Preis ausgezeichnet. Nach einem Postdoc-Aufenthalt an der Humboldt-Universität Berlin kehrte er 1999 nach Köln zurück. 2011 schloss er seine Habilitation in Organischer Chemie an der Universität Köln ab. Seit 2017 ist er Apl. Professor im Department für Chemie. Seit 1999 leitet er die Massenspektrometrie-Labore des Departments für Chemie. Mathias Schäfer ist seit mehr als 20 Jahren im Pan African Chemistry Network PACN der RSC engagiert und hilft dort mit, die nachhaltige Zusammenarbeit mit Wissenschaftler:innen aus Ländern mit geringfügig ausgeprägter bzw. im Aufbau befindlicher Forschungsinfrastruktur zu stärken.
Forschungsinteressen von Mathias Schäfer beinhalten unter anderem die Entwicklung von neuen Reagenzien zum chemischen Crosslinking und die detaillierte Untersuchung von Ionen mittels Gasphasen-chemie und Spektroskopie. M. Schäfer ist Koautor von zwei Massenspektrometrie-Lehrbüchern und hat 120 Publikationen in in-ternationalen Fachzeitschriften publiziert.
Mehr erfahrenPublikationen von
Prof. Dr. Mathias Schäfer
120. Marcel Bast, Julian Böing, Thomas Salomon, Eline Plaar, Igor Savić, Mathias Schäfer, Oskar Asvany, Stephan Schlemmer, Sven Thorwirth, Spectroscopic detection and characterization of cyanooxomethylium, NCCO+, Journal of Physical Chemistry A, 2025, 129, 11136–11144.
119. Wacharee Harnying, Hui-Chung Wen, Jonathan Martens, Giel Berden, Jos Oomens, Jana Roithová, Albrecht Berkessel, Mathias Schäfer* and Anthony J.H.M. Meijer*, Gas-phase Curtius and Wolff rearrangement reactions investigated by tandem-MS, IR ion spectroscopy and theory, Physical Chemistry Chemical Physics, 2025, 27, 13543–13556. DOI: 10.1039/D5CP01532D
118. Hui-Chung Wen, Felicitas Wagener, Thomas Piper, Jörg Neudörfl, Mario Thevis,* and Mathias Schäfer*, Investigations into Structures of in vitro-Derived Phase I Metabolites of a Novel 20-Keto-Steroid S42 by GC-EI HR MS Analysis and Chemical Synthesis, Drug Testing Analysis, Drug Testing and Analysis, 2025; 17:1822–1833. doi.org/10.1002/dta.3890
117. Thiemo Arndt, Mathias Schäfer, Dietmar Kuck, Martin Breugst, A Unique Intramolecular Redox Reaction by Unidirectional Migration of Three Hydrogen Atoms: Theoretical Elucidation of the 3H-Transfer Sequence, Chem. Eur. J. 2025, e202404638. https://doi.org/10.1002/chem.202404638
116. Ronald Tarazona Delgado; Burkhard Becker; Ekaterina Pushkareva; Mathias Schäfer; Carlos Rafael Borges Mendes, Polyphasic characterization and genomic insights of the cyanobacteria Aphanothece microscopica and A. stagnina from Southern Brazil with emphasis on fatty acid biosynthesis, Current Genetics 2025, 71:22. doi.org/10.1007/s00294-025-01328-7
115. Hui-Chung Wen, Tobias Wilczek, Jörg-M. Neudörfl, Felicitas Wagener, Thomas Piper, Mario Thevis, Mathias Schäfer, A comprehensive gas chromatography electron ionization high resolution mass spectrometry study of a new steroidal selective androgen receptor modulator (SARM) compound S42, J Mass Spectrom. 2024;59:e5077. doi.org/10.1002/jms.5077
114. Marcel Bast, Julian Böing, Thomas Salomon, Sven Thorwirth, Oskar Asvany, Mathias Schäfer, Stephan Schlemmer, Ro-vibrational spectra of the C-C stretching modes of C3H+ and HC3O+, Journal of Molecular Spectroscopy, 398 (2023) 111840.
113. Mathias Paul, Thomas Thomulka, Wacharee Harnying, Jörg-Martin Neudörfl, Charlie R. Adams, Jonathan Martens, Giel Berden, Jos Oomens,* Anthony J. H. M. Meijer,* Albrecht Berkessel,* and Mathias Schäfer,* Hydrogen Bonding Shuts Down Tunneling in Hydroxycarbenes: A Gas-Phase Study by Tandem-Mass Spectrometry, Infrared Ion Spectroscopy, and Theory, Journal of the American Chemical Society, 145 (2023) 12124-12135. https://doi.org/10.1021/jacs.3c01698
112. Dennis Zeh, Marcel Bast, Jonathan Martens, Giel Berden, Jos Oomens, Sandra Brünken, Stefan Schlemmer, Mathias Schäfer,* Dietmar Kuck,* Unidirectional Double and Triple Hydrogen Rearrangement Reactions Probed by Infrared Ion Spectroscopy, Journal of American Society of Mass Spectrometry 33 (2022) 1377−1392. https://doi.org/10.1021/jasms.2c00039
111. Brandon C. Stevenson, Katrin Peckelsen, Jonathan Martens, Giel Berden, Jos Oomens, Mathias Schäfer, and P. B. Armentrout,* An Investigation of Inter-Ligand Coordination and Flexibility: IRMPD Spectroscopic and Theoretical Evaluation of Calcium and Nickel Histidine Dimers, Journal of Molecular Spectroscopy, 381 (2021) 111532. https://doi.org/10.1016/j.jms.2021.111532
110. Dennis Zeh, Marcel Bast, Daniël B. Rap, Philipp C. Schmid, Sven Thorwirth*, Sandra Brünken*, Stephan Schlemmer*, Mathias Schäfer*, Cryogenic Messenger-IR Ion Spectroscopy study of phenol & aniline molecular ions and of the common fragment ion [C5H6]•+ formed by EI-MS, Journal of Molecular Spectroscopy, 378 (2021) 111453. https://doi.org/10.1016/j.jms.2021.111453
109. Hauke Engler, Markus Lansing, Christopher Gordon, Jörg-Martin Neudörfl, Mathias Schäfer, Nils Schlörer, Christophe Copéret, Albrecht Berkessel*, Olefin Epoxidation Catalyzed by Titanium-salalen Complexes: Synergistic H2O2 Activation by Dinuclear Ti-Sites, Ligand H-Bonding and π-Acidity, ACS Catalysis, 2021, 11, 3206−3217.
108. Mathias Paul, Katrin Peckelsen, Thomas Thomulka, Jonathan Martens, Giel Berden, Jos Oomens, Jörg-M. Neudörfl, Martin Breugst*, Anthony J. H. M. Meijer*, Mathias Schäfer*, and Albrecht Berkessel*, Breslow Intermediates (Aminoenols) and their Keto Tautomers: First Gas-Phase Characterization by IR Ion Spectroscopy, Chemistry a European Journal, 2021, 27, 2662 – 2669.
107. Brandon C. Stevenson, Jonathan Martens, Mathias Schäfer, Jos Oomens and P. B. Armentrout, IRMPD Spectroscopic and Theoretical Structural Investigations of Zinc and Cadmium Dications Bound to Histidine Dimers, Journal of Physical Chemistry A, 49 (2020) 10266–10276.
106. Patrick Esch, Moritz Fischer, Sven Heiles, Mathias Schäfer, Olefinic reagents tested for peptide derivatization with switchable properties: stable upon Collision Induced Dissociation and cleavable by In-Source Paternò-Büchi Reactions, Journal of Mass Spectrometry 54 (2019) 976–986. DOI: 10.1002/jms.4474
105. Christian Ihling, Patrizia Springorum, Claudio Iacobucci, Christoph Hage, Michael Goetze, Mathias Schaefer, Andrea Sinz, The Isotope-Labeled, MS-Cleavable Cross-Linker Disuccinimidyl Dibutyric Urea (DSBU) for Improved Cross-Linking/Mass Spectrometry Studies, Journal of the American Society of Mass Spectrometry, 31 (2020) 183−189.
104. Mathias Paul, Katrin Peckelsen, Thomas Thomulka, Jörg Neudörfl, Jonathan Martens, Giel Berden, Jos Oomens,Albrecht Berkessel, Anthony J. H. M. Meijer and Mathias Schäfer,Hydrogen Tunneling Avoided: Enol-Formation From a Charge-tagged Phenyl Pyruvic Acid Derivative Evidenced by Tandem-MS, IR Ion Spectroscopy and Theory, Physical Chemistry Chemical Physics, 21 (2019) 16591-16600.
103. Mathias Paul, Eric Detmar, Maria Schlangen, Martin Breugst, Jörg-Martin Neudörfl, Helmut Schwarz, Albrecht Berkessel, and Mathias Schäfer, Intermediates of N-Heterocyclic Carbene (NHC) Dimerization Probed in the Gas Phase by Ion Mobility Mass Spectrometry: C-H···꞉C Hydrogen Bonding vs. Covalent Dimer Formation, Chemistry A European Journal 25 (2019) 2511 – 2518. http://dx.doi.org/10.1002/chem.201803641
102. Andrea Sinz, Claudio Iacobucci, Michael Götze, Christoph Hage, Christian Arlt, Christian Ihling, Rico Schmidt, Christine Piotrowski, and Mathias Schaefer, A Cross-linking/Mass Spectrometry Workflow Based on MS-Cleavable Cross-Linkers and the MeroX Software for Studying Protein Structures and Protein-Protein Interactions, Nature Protocols 13 (2018) 2864–2889.
101. Mathias Schäfer, MS fundamentals and instrumentation, Encyclopedia of Analytical Science, 3rd Edition, (2019) Elsevier.
100. Claudio Iacobucci, Mathias Schäfer, Andrea Sinz, Free Radical-Initiated Peptide Sequencing (FRIPS)-Based Cross-linkers for Improved Peptide and Protein Structure Analysis, Mass Spectrometry Reviews 38 (2019) 187–201. https://doi.org/10.1002/mas.21568
99. Adam Wutkowski, Matthias Krajewski, Navratan Bagwan, Mathias Schäfer, Bhesh R. Paudyal, Ulrich. E Schaible, Dominik Schwudke, Dedicated Approach for Software-Aided Quality Control of Liquid Chromatography-High-Resolution Tandem Mass Spectrometry Quantitation of Lipid Mediators, Analytica Chimica Acta 1037 (2018) 168-176. https://doi.org/10.1016/j.aca.2018.01.044
98. Axel Klein, Natalia Arefyeva, Aaron Sandleben, Alexander Krest, Ulrich Baumann, Martin Valldor, Mathias Schäfer, Maxim Kempf, Ni(II) and Zn(II) [2 x 2] Molecular Grids with 1,4-Pyrazine-bridged Bis(thiosemicarbazones), Inorganics 2018, 6(2):51. https://doi.org/10.3390/inorganics6020051
97. Christopher Stoffels, Mhmd Oumari, Aris Perrou, Andreas Termath, Waldemar Schlundt, Hans-Günther Schmalz, Mathias Schäfer, Sabine Metzger, Vera Wewer, Edgar Schömig, Dirk Gründemann, Ergothioneine stands out from hercynine in the reaction with singlet oxygen: resistance to glutathione and TRIS in the generation of specific products indicates high reactivity, Free Radical Biology and Medicine 113 (2017) 385-394.
96. Katrin Peckelsen, Jonathan Martens, Lisa Czympiel, Jos Oomens, Giel Berden, Dirk Gründemann, Anthony Meijer, Mathias Schäfer, Ergothioneine and related Histidine Derivatives in the Gas Phase: Tautomer Structures determined by IRMPD Spectroscopy and Theory, Physical Chemistry Chemical Physics, 19 (2017) 23362 - 23372.
95. Claudio Iacobucci, Christoph Hage, Mathias Schäfer, Andrea Sinz, A Novel MS-Cleavable Azo Cross-Linker for Peptide Structure Analysis by Free Radical Initiated Peptide Sequencing (FRIPS), Journal of the American Society of Mass Spectrometry, 28 (2017)2039-2053.
94. Christoph Hage, Francesco Falvo, Mathias Schäfer, Andrea Sinz, Novel Concepts of MS-Cleavable Cross-linkers for Improved Peptide Structure Analysis, Journal of the American Society of Mass Spectrometry, 28 (2017) 2022–2038.
93. Christian Arlt, Vanessa Flegler, Christian H. Ihling, Mathias Schäfer, Iris Thondorf, Andrea Sinz, Structure of Full-Length Wild-Type Tetrameric p53 Tumor Suppressor Probed by an Integrated Mass Spectrometry-Based Approach, Angewandte Chemie 56 (2017) 275–279.
92. Christian Arlt, Michael Götze, Christian H. Ihling, Mathias Schäfer, Andrea Sinz, An Integrated Workflow for Structural Proteomics Studies based on Cross-linking/Mass Spectrometry with an MS/MS Cleavable Cross-linker, Analytical Chemistry 88 (2016) 7930−7937.
91. K. Peckelsen, J. Martens, G. Berden, J. Oomens, R.C. Dunbar, A.J.H.M. Meijer, M. Schäfer, Gas-Phase Complexes of Ni(II) and Ca(II) with Deprotonated Histidylhistidine: A Model Case for Polyhistidyl-Metal Binding Motifs, Journal of Molecular Spectroscopy 332 (2017) 38−44.
90. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Albrecht Berkessel, Anthony J. H. M. Meijer, Hydrogen Tunneling Above Room Temperature: A Gas-Phase Study of Phenylhydroxycarbene, Journal of the American Chemical Society 139 (2017) 5779−5786. DOI: 10.1021/jacs.6b10348
Cover of Issue 18, Journal of the American Chemical Society 139 (2017) 5779. & Spotlights on Recent JACS Publications, Journal of the American Chemical Society 139 (2017) 6277–6277.
89. Christoph Hage, Mathias Schäfer, Andrea Sinz, Dissociation Behavior of a TEMPO-Active Ester Cross-linker for Peptide Structure Analysis by Free Radical Initiated Peptide Sequencing (FRIPS) in Negative ESI-MS, Journal of the American Society of Mass Spectrometry, 28 (2017) 56-68. Doi: 10.1007/s13361-016-1426-9
88. Ran Wang, Bo Yang, R.R. Wu, Mary T. Rodgers, Mathias Schäfer, P.B. Armentrout, Guided Ion Beam and Computational Studies of the Decomposition of a Model Thiourea Protein Cross-Linker, Journal of Physical Chemistry B 119 (2015) 3727-3742. DOI: 10.1021/jp512997z
87. Lukas Fiebig, Joseph Held, Hans-Günther Schmalz, Mathias Schäfer, Individual steps of the Mizoroki-Heck Reaction studied in the Gas-Phase: Kinetics and Substituent Effects reveal the Intrinsic Reactivity of Intermediate Organopalladium Complexes, European Journal of Mass Spectrometry 21 (2015) 623-633.
86. Mikhail M. Kremlev, Aleksej I. Mushta, Wieland Tyrra, Yurii L. Yagupolskii, Dieter Naumann, Mathias Schäfer, Approaches to prepare perfluoroalkyl and pentafluorophenyl copper couples for cross-coupling reactions with organohalogen compounds, Dalton Transactions 44 (2015) 19693-19699.
85. Christian Ihling, Francesco Falvo, Isabel Kratochvil, Andrea Sinz, Mathias Schäfer, Dissociation Behavior of a Bifunctional TEMPO-Active Ester Reagent for Peptide Structure Analysis by Free Radical Initiated Peptide Sequencing (FRIPS) Mass Spectrometry, Journal of Mass Spectrometry 50 (2015) 396-406.
84. Mareike C. Holland, Giel Berden, Jos Oomens, Anthony J.H.M. Meijer, Mathias Schäfer, Ryan Gilmour, Infrared Multiphoton Dissociation (IRMPD) Spectroscopic Analysis of Non-Covalent Interactions in Organocatalysis, European Journal of Organic Chemistry (2014) 5675-5680. DOI: 10.1002/ejoc.201402845
83. Lisa Czympiel, Johannes Pfrommer, Wieland Tyrra, Mathias Schäfer, Sanjay Mathur, Ligand-modulated chemical and structural implications in four-, five- and six-coordinated aluminum heteroaryl-alkenolates, Inorganic Chemistry54 (2015) 25-37.
82. Lukas Fiebig, Nils Schlörer, Hans-Günther Schmalz, Mathias Schäfer, Aryl-phenyl Scrambling in intermediate organopalladium complexes. A gas-phase study of the Mizoroki-Heck reaction, Chemistry - A European Journal 20 (2014) 4906-4910. DOI: 10.1002/chem.201400115
81. Michael Götze, Jens Pettelkau, Romy Fritzsche, Christian H. Ihling, Mathias Schäfer, Andrea Sinz, Automated Assignment of MS/MS Cleavable Cross-Links in Protein 3D-Structure Analysis, Journal of the American Society of Mass Spectrometry, 26 (2015) 83-97. DOI: 10.1007/s13361-014-1001-1
80. Lukas Fiebig, Julian Kuttner, Gerhard Hilt, Martin C. Schwarzer, Gernot Frenking, Hans-Günther Schmalz, Mathias Schäfer, Cobalt Catalysis in the Gas Phase: Experimental Characterization of Cobalt(I) Complexes as Intermediates in Regioselective Diels-Alder Reactions, Journal of Organic Chemistry 78 (2013) 10485–10493. DOI: http://dx.doi.org/10.1021/jo402001g
79. Francesco Falvo, Lukas Fiebig, Mathias Schäfer, Presentation of a homobifunctional azo-reagent for protein structure analysis by collision-induced dissociative chemical cross-linking: Proof-of-Principle, International Journal of Mass Spectrometry, 354–355 (2013) 26–32. DOI: http://dx.doi.org/doi:10.1016/j.ijms.2013.04.012
78. Ellen Pauwelyn, Chien-Jui Huang, Marc Ongena, Valerie Leclere, Philippe Jacques, Peter Bleyaert, Herbert Budzikiewicz, Mathias Schäfer, Monica Höfte, New linear lipopeptides produced by Pseudomonas cichorii SF1-54 modulate virulence, swarming motility and biofilm formation, Molecular Plant-Microbe Interactions, 26 (2013) 585-598.
77. Francesco Falvo, Lukas Fiebig, Frank Dreiocker, Ran Wang, P. B. Armentrout, and Mathias Schäfer, Fragmentation reactions of thiourea- and urea-compounds examined by tandem MS-, energy-resolved CID experiments, and theory, International Journal of Mass Spectrometry, 330-332 (2012) 124-133.
76. Lisa Brückmann, Wieland Tyrra, Sanjay Mathur, Giel Berden, Jos Oomens, Anthony J.H.M. Meijer and Mathias Schäfer Examination of the coordination sphere of Al(III) in trifluoromethyl-heteroarylalkenolato-complex-ions by gas-phase IRMPD spectroscopy and computational modelling, ChemPhysChem, 13 (2012) 2037-2045. DOI: 10.1002/cphc.201200132
75. Mario Thevis, Simon Beuck, Sebastian Höppner, Andreas Thomas, Joseph Held, Mathias Schäfer, Jos Oomens, and Wilhelm Schänzer, Structure elucidation of the diagnostic product ion at m/z 97 derived from androst-4-en-3-one-based steroids by ESI-CID and IRMPD spectroscopy, Journal of the American Society of Mass Spectrometry 23 (2012) 537-546. DOI: 10.1007/s13361-011-0308-4
74. H. Budzikiewicz, M. Schäfer, Massenspektrometrie - Eine Einführung, 6. vollständig überarbeitete & aktualisierte Auflage, Wiley-VCH Weinheim, 2012.
73. Mélissa Hannauer, Mathias Schäfer, Françoise Hoegy, Patrick Gizzi, Patrick Wehrung, Gaëtan L. A. Mislin, Herbert Budzikiewicz, Isabelle J. Schalk, Biosynthesis of the pyoverdine siderophore of Pseudomonas aeruginosa involves precursors with a myristic or a myristoleic acid chain, Federation of European Biochemical Societies Letters - FEBS Letters 586 (2012) 96-101.
72. Lukas Fiebig, Hans-Günther Schmalz and Mathias Schäfer*, Heck Coupling in the Gas Phase: Examination of the Reaction Mechanism by Ion/Molecule Reactions and Mass Spectrometry, International Journal of Mass Spectrometry 308 (2011) 307-310. DOI:10.1016/j.ijms.2011.07.013.
71. Ahmad R. Massah, Frank Dreiocker, Richard F.W. Jackson, Barry T. Pickup, Jos Oomens, Anthony J.H.M. Meijer* and Mathias Schäfer*, Gas-phase study of new organozinc reagents by IRMPD-Spectroscopy, Computational modeling and Tandem-MS, Physical Chemistry Chemical Physics 13 (2011) 13255-13267. DOI: 10.1039/C1CP20747D.
70. Mathias Q. Müller, Johannes J. Zeiser, Frank Dreiocker; Andreas Pich, Mathias Schäfer, Andrea Sinz*, A Universal MALDI Cleavable Cross-Linker for Protein Structure Analysis, Rapid Communications in Mass Spectrometry 25 (2011) 155–161.
69. Andrew J. Ross, Frank Dreiocker, Mathias Schäfer, Jos Oomens, Anthony J. H. M. Meijer, Barry T. Pickup, Richard F. W. Jackson*, Evidence for the role of TMEDA in aqueous Negishi cross-coupling: synthesis of non-proteinogenic phenylalanine derivatives in water, Journal of Organic Chemistry 76 (2011) 1727-1734.
68. Mario Thevis*, Andreas Thomas, Maxie Kohler, Simon Beuck, Ines Möller, Mathias Schäfer, Grigory Rodchenkov, Sheng Yin, Joseph A. Loo, Hans Geyer, Wilhelm Schänzer, Mass spectrometry-based characterization of new drugs and methods of performance manipulation in doping control analysis, European Journal of Mass Spectrometry 16 (2010) 301-312. DOI: 10.1255/ejms.1047
67. Albrecht Berkessel*, Philipp Christ, Jörg-M. Neudörfl, Mathias Schäfer, Synthesis and Structural Characterization of a New Class of Strong Chiral Brønsted Acids: 1,1-Binaphthyl-2,2-bis(sulfuryl)imides (JINGLEs), European Journal of Organic Chemistry (2010) 5165-5170.
66. Mathias Q. Müller, Frank Dreiocker, Christian H. Ihling, Mathias Schäfer*, Andrea Sinz*, A Novel Cleavable Cross-Linker for Protein Structure Analysis: Reliable Identification of Cross-Linking Products by Tandem MS, Analytical Chemistry 82 (2010) 6958-6968.
65. Miriam K. Drayß, P. B. Armentrout, Jos Oomens*, Mathias Schäfer*, IR spectroscopy of cationized aliphatic amino acids: Stability of charge-solvated structure increases with metal cation size, International Journal of Mass Spectrometry 297 (2010) 18-27. DOI: 10.1016/j.ijms.2010.04.010
64. Mathias Q. Müller, Frank Dreiocker, Christian H. Ihling, Mathias Schäfer*, Andrea Sinz*, Fragmentation behavior of a thiourea-based reagent for protein structure analysis by collision-induced dissociative chemical cross-, Journal of Mass Spectrometry 45 (2010) 880-891. DOI: 10.1002/jms.1775
63. Frank Dreiocker, Jos Oomens, Anthony J.H.M. Meijer, Barry T. Pickup, Richard F.W. Jackson*, Mathias Schäfer*, Structure elucidation of Dimethylformamide Solvated Alkylzinc Cations in the Gas Phase, Journal of Organic Chemistry 75 (2010) 1203-1213. DOI: 10.1021/jo902492z
62. Frank Dreiocker, Mathias Q. Müller, Andrea Sinz*, Mathias Schäfer*, Collision-Induced Dissociative Chemical Cross-Linking Reagent for Protein Structure Characterization: Applied Edman Chemistry in the Gas Phase, Journal of Mass Spectrometry 45 (2010) 178-189.DOI: 10.1002/jms.1702
61. Henry Moll*, Maja Glorius, Anna Johnsson, Mathias Schäfer, Herbert Budzikiewicz, Karsten Pedersen, Gert Bernhard, Neptunium(V) complexation with natural pyoverdins and related model compounds, Radiochim. Acta 98 (2010) 571-576. DOI 10.1524/ract.2010.1755
60. Stefan Berking, Uwe Hoffmann, Mathias Schäfer, Klaus Herrmann*, Methionine in pattern control of Hydra, Central European Journal of Biology 4 (2009) 549-557. available online: DOI 10.2478/s11535-009-0038-9
59. Mario Thevis*, Simon Beuck, Andreas Thomas, Gregor Fußhöller, Nils Schlörer, Mathias Schäfer, Wilhelm Schänzer, Electron Ionization Mass Spectrometry of the Ryanodine Receptor-based Ca2+-Channel Stabilizer S-107 and its Implementation into Routine Doping Control, Rapid Communications in Mass Spectrometry, 23 (2009) 2363-2370.
58. Sandra Matthijs, Georges Laus, Jean-Marie Meyer, Kourosch Abbaspour-Tehrani, Mathias Schäfer, Herbert Budzikiewicz, Pierre Cornelis*, Siderophore-mediated iron acquisition in the entomopathogenic bacterium Pseudomonas entomophila L48 and its close relative Pseudomonas putida KT2440, Biometals 22 (2009) 951-964.
57. Mathias Schäfer*, Miriam K. Drayß, Dirk Blunk, Jeremiah M. Purcell, Christopher L. Hendrickson, Alan G. Marshall, Abhigya Mookherjee and P. B. Armentrout, Kinetic Determination of Potassium Affinities by IRMPD: Elucidation of Precursor Ion Structures, Journal of Physical Chemistry A 113 (2009) 7779-7783. DOI: 10.1021/jp903232y
56. Rabindranath, A. Raman; Maier, Anna; Schäfer, Mathias; Tieke, Bernd*, Luminescent and ionochromic polyiminofluorene with conjugated terpyridine substituent groups, Macromolecular Chemica Physics 210 (2009) 659-668.
55. Miriam K. Drayß, Dirk Blunk, Jos Oomens, Bing Gao, Thomas Wyttenbach, Michael T. Bowers and Mathias Schäfer*, Systematic study of the structures of potassiated tertiary amino acids: Salt bridge structures dominate, Journal of Physical Chemistry A 113 (2009) 9543-9550. DOI: 10.1021/jp903036t
54. Katharina Butsch, Sait Elmas, Nalinava Sen Gupta, Ronald Gust, Frank Heinrich, Axel Klein*, Yvonne von Mering, Michael Neugebauer, Ingo Ott, Mathias Schäfer, Harald Scherer, and Thilo Schurr, Organoplatinum(II) and -palladium(II) Complexes of Nucleobases and Their Derivatives, Organometallics 28 (2009) 3906-3915.
53. Miriam K. Drayß, Dirk Blunk, Jos Oomens, Nick Polfer, Carsten Schmuck, Bing Gao, Thomas Wyttenbach, Michael T. Bowers, Mathias Schäfer*, Gas-Phase Structures of Solution-Phase Zwitterions: Charge Solvation or Salt Bridge? International Journal of Mass Spectrometry 281 (2009) 97-100.
52. Mathias Schäfer*, Frank Dreiocker, Herbert Budzikiewicz, Collision-induced loss of AgH from Ag+-adducts leads exclusively to thermodynamically favored product ions, Journal of Mass Spectrometry 44 (2009) 278-284.
51. Drayß Miriam, Dirk Blunk, Jos Oomens, Mathias Schäfer*, Infrared Multiple Photon Dissociation Spectroscopy of Potassiated Proline, Journal of Physical Chemistry A 112 (2008) 11972-11974.
50. Axel G. Griesbeck*, Mathias Schäfer, Johannes Uhlig, Photooxygenation catalysis with a polyol-decorated disc-shaped porphyrine sensitizer: shell-recognition effects, Advanced Synthesis and Catalysis 350 (2008) 2104-2108.
49. Henry Moll*, Maja Glorius, Gert Bernhard, Anna Johnsson, Karsten Pedersen, Mathias Schäfer, Herbert Budzikiewicz, Characterization of Pyoverdins Secreted by a Subsurface Strain of Pseudomonas fluorescens and their Interactions with Uranium(VI), Geomicrobiology Journal 25 (2008) 157-166.
48. Albrecht Berkessel*, Marc Brandenburg, Mathias Schäfer, Mass-Spectrometrical and Kinetic Studies on the Mechanism and Degradation Pathways of Titanium Salalen Catalysts for Asymmetric Epoxidation with Aqueous Hydrogen Peroxide, Advanced Synthesis and Catalysis 350 (2008) 1287-1294.
47. Sandra Matthijs, Herbert Budzikiewicz, Mathias Schäfer, Bernard Wathelet, Pierre Cornelis*, Ornicossugatin, a new siderophore from Pseudomonas fluoreszens AF76, Zeitschrift für Naturforschung 63 (2008) 8-12.
46. Christina D. Moon*, Xue-Xian Zhang, Sandra Matthijs, Mathias Schäfer, Herbert Budzikiewicz, Paul. B. Rainey, Genomic and genetic analysis of pyoverdine-mediated iron acquisition in a plant growth-promoting bacterium, Pseudomonas fluorescens SBW25, BMC Microbiology 8 (2008) 7.
45. Jean-Marie Meyer*, Mathias Schäfer, Herbert Budzikiewicz, Siderotyping of fluorescent Pseudomonas: molecular mass determination by mass spectrometry as a powerful pyoverdine siderotyping method, Biometals21 (2008) 259-271.
44. Marc Ongena*, Emmanuel Jourdan, Akram Adam, Mathias Schäfer, Herbert Budzikiewicz, Philippe Thonart, Amino Acids, iron and growth rate as key factors influencing production of the Pseudomonas putida BTP1 benzylamine derivative involved in systemic resistance induction in different plants, Microbiology Ecology 55 (2008) 280-292.
43. Henry Moll*, Anna Johnsson, Mathias Schäfer, Karsten Pedersen, Herbert Budzikiewicz, Gert Bernhard, Curium(III) complexation with pyoverdins secreted by a groundwater strain of Pseudomonas fluorescens, BioMetals 21 (2008) 219-228.
42. Albrecht Berkessel*, Marc Brandenburg, Eva Leitterstorf, Julia Frey, Johann Lex, Mathias Schäfer, A Practical and Versatile Access to Dihydrosalen (Salalen) Ligands: Highly Enantioselective Titanium In Situ Catalysts for Asymmetric Epoxidation with Aqueous Hydrogen Peroxide, Advanced Synthesis and Catalysis 349 (2007) 2385-2391.
41. Herbert Budzikiewicz*, Mathias Schäfer, Jean-Marie Meyer, Siderotyping of Fluorescent Pseudomonads - Problems in the Determination of Molecular Masses by Mass Spectrometry, Mini-Reviews in Organic Chemistry, 4 (2007) 246-253.
40. Carsten Schmuck*, Thomas Rehm, Lars Geiger, Mathias Schäfer, Synthesis and self-association properties of flexible guanidiniocarbonyl pyrrole-carboxylate-zwitterions in DMSO: Intra- versus intermolecular charge interactions, Journal for Organic Chemistry, 72 (2007) 6162-6170.
39. Mathias Schäfer*, Miriam Drayß, Andreas Springer, Philipp Zacharias, Klaus Meerholz, Radical Cations in Electrospray Mass Spectrometry: Formation of Open-Shell Species, Examination of the Fragmentation Behaviour in ESI-MSn and Reaction Mechanism Studies via Detection of Transient Radical Cations, European Journal of Organic Chemistry 31 (2007) 5162-5174.
38. Herbert Budzikiewicz*, Mathias Schäfer, Diana Uria Fernández, Sandra Matthijs, Pierre Cornelis, Characterization of the chromophores of pyoverdins and related siderophores by electrospray tandem mass spectrometry, BioMetals 20 (2007) 135-144.
37. Herbert Budzikiewicz*, Mathias Schäfer, Diana Uria Fernández, Jean-Marie Meyer, Structure Proposal for a New Pyoverdin from Pseudomonas sp. PS 6.10, Zeitschrift für Naturforschung 61c (2006) 815-820.
36. Mathias Schäfer*, Regine Fuchs, Herbert Budzikiewicz, Andreas Springer, Jean-Marie Meyer, Michael Linscheid, Structure elucidation of cyclic pyoverdins and examination of rearrangement reactions in MS/MS experiments by determination of exact product ion masses, Journal of Mass Spectrometry 41 (2006) 1162-1170.
35. Ongena M.*, Jourdan E., Schäfer M., Kech C., Budzikiewicz H., Luxen A., Thonart P.,Isolation of an n-alkylated benzylamine derivative from Pseudomonas putida BTP1 as elicitor of induced systemic resistance in bean, Molecular Plant-Microbe Interactions 18 (2005) 562-569.
34. Budzikiewicz H., Schäfer M., Massenspektrometrie - Eine Einführung, 5. vollständig überarbeitete & aktualisierte Auflage, Wiley-VCH Weinheim, 2005.
33. Naumann D.*, Tyrra W., Quadt S., Buslei S., Pantenburg I., Schäfer M., Bis(trifluoromethylselenato(0))metallates(I) of Silver and Gold, [M(SeCF3)2]-
(M = Ag, Au), Z. Anorg. Allg. Chem. 631 (2005) 2733-2737.
32. Silberbach M.*, Schäfer M., Hüser A., Kalinowski J., Pühler A., Krämer R., Burkovski A., Adaptation of Corynebacterium glutamicum to ammonium limitation: a global analysis using transcriptome and proteome techniques, Appl. Env. Microbiol. 71 (2005) 2391-2402.
31. Kirij N.V.*, Tyrra W., Naumann D., Yagupolskii Y.L., Pantenburg I., Schäfer M., Bis(trifluoromethyltellurato(0))metallates(I) of copper, silver and gold, [M(TeCF3)2]- (M = Cu, Ag, Au), Journal of Fluorine Chemistry 125 (2004) 1933-1938.
30. Bultreys A., Gheysen I., Wathelet B., Schäfer M., Budzikiewicz H.*, The Pyoverdins of Pseudomonas syringae and Pseudomonas cichorii, Zeitschrift für Naturforschung 59c (2004) 613-618.
29. Schäfer M.*, Schmuck C., Geiger L., Chalmers M.J., Hendrickson C.L., Marshall A.G., Structurally related non-covalent complexes examined by quadrupole ion trap (QIT) MS2 and infrared multiphoton dissociation Fourier transform ion cyclotron resonance mass spectrometry IRMPD-FT-ICR MS: evidence for salt-bridge structures in the gas phase, International Journal of Mass Spectrometry 237/1 (2004) 33-45.
28. Ruangviriyachai C., Uría Fernández D., Schäfer M., Budzikiewicz H.*, Structure proposal for a new pyoverdin from a Thai Pseudomonas putida strain, Spectroscopy 18 (2004) 453-458.
27. Sandra Matthijs, Christine Baysse, Nico Koedam, Kourosh Abbaspour Tehrani, Lieve Verheyden, Herbert Budzikiewicz, Mathias Schäfer, Bart Hoorelbeke, Jean-Marie Meyer, Henri De Greve and Pierre Cornelis, The Pseudomonas siderophore quinolobactin is synthesized from xanthurenic acid, an intermediate of the kynurenine pathway Molecular Microbiology 52 (2004) 371-384.
26. Schäfer M.*, The Expanding Role of Mass Spectrometry in Biotechnology, by Gary Siuzdak, Book Review, ChemBioChem 5 (2004) 887.
25. Schäfer M., Schlörer N., Internet-Based Spectroscopy Tools: Instructive Aids for Molecular-Structure Analysis? Angewandte Chemie International Edition, 43 (2004) 2878.
24. Schäfer M., Schlörer N., Das Internet - lehrreiche Hilfe bei der molekularen Strukturaufklärung? Angewandte Chemie, 116 (2004) 2938.
23. Uría Fernández D., Geoffroy V., Schäfer M., Budzikiewicz H., Meyer J.-M.*, Structure Revision of Several Pyoverdins Produced by Plant-Growth Promoting and Plant-Deleterious Pseudomonas Species, Monatshefte für Chemie Chemical Monthly 134 (2003) 1421-1431.
22. Schäfer M.*, Schmuck C., Heil M., Cooper H.J., Hendrickson C.L., Chalmers M.J., Marshall A.G., Determination of the Activation Energy for Unimolecular Dissociation of a Non-Covalent Gas-Phase Peptide: Substrate Complex by Infrared Multiphoton Dissociation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Journal of the American Society for Mass Spectrometry, 14 (2003) 1282-1289.
21. Schäfer M.*, Supramolecular Crown Ether Adducts in the Gas Phase: From Molecular Recognition of Amines to the Covalent Coupling of Host/Guest Molecules, Angew. Chem. Int. Ed., 42 (2003) 1896-1899.
20. Schäfer M.*, Kronenether-Komplexe in der Gasphase: von der molekularen Erkennung von Aminen bis zur kovalenten Verknüpfung von Wirt- und Gastmolekülen, Angewandte Chemie, 115 (2003) 1940-1943.
19. Uría Fernández D., Fuchs R., Schäfer M., Budzikiewicz H.*, Meyer J.-M., The Pyoverdin of Pseudomonas fluorescens G173, a Novel Structural Type Accompanied by Unexpected Natural Derivatives of the Corresponding Ferribactin, Zeitschrift für Naturforschung, 58c (2003) 1-10.
18. Schäfer M., Principles and Practice of Biological Mass Spectrometry Edited by Chhabil Dass, Book Review, ChemBioChem, 3 (2002) 1159.
17. Mossialos D., Ochsner U., Baysee C., Chablain P., Pirnay J.-P., Koedam N., Budzikiewicz H., Uría Fernández D., Schäfer M., Ravel J., Cornelis P.*, Identification of new, conserved, non-ribosomal peptide synthetases from fluorescent pseudomonads involved in the biosynthesis of the siderophore pyoverdine. Molecular Microbiology, 45 (2002) 1673-1685.
16. Schalley C.A.*, Müller T., Linnartz P., Witt M., Schäfer M., Lützen A., Mass Spectrometric Characterization and Gas-Phase Chemistry of Self-Assembling Supramolecular Squares and Triangles. Chem. Eur. Journal, 8 (2002) 3538-3551.
15. Marner F.-J.*, Singab A.N.B., Al-Azizi M.M., El-Emary N.A., Schäfer M., Iridal Glycosides from IRIS SPURIA (ZEAL), cultivated in Egypt. Phytochemistry, 60 (2002) 301-307.
14. Schlegel K., Fuchs R., Schäfer M., Taraz K., Budzikiewicz H., Geoffroy V., Meyer J.-M.*, The Pyoverdins of Pseudomonas sp.96-312 and 96-318, Zeitschrift für Naturforschung, 56c (2001) 680-686.
13. O'Leary B.M., Szabo T., Svenstrup N., Schalley C.A.*, Lützen A., Schäfer M., Rebek Jr. J., "Flexiball" Toolkit: A Modular Approach to Self-Assembling Capsules, Journal of American Chemical Society, 123 (2001) 11519-11532.
12. Ongena M.*, Jacques P., Thonart P., Gwose I., Uría Fernández D., Schäfer M., Budzikiewicz H., The pyoverdin of Pseudomonas fluorescens BTP2, a novel structural type, Tetrahedron Letters 42 (2001) 5849-5851.
11. Hohlneicher U., Schäfer M., Fuchs R., Budzikiewicz H.*, Ferribactins as the Biosynthetic Precursors of the Pseudomonas Siderophores Pyoverdins, Zeitschrift für Naturforschung 56C (2001) 308-310.
10. Schäfer M. (exc. ed.) Novel Biochemical, Microbiological and Analytical Developments concerning pathogenic Bacteria: Focus on Pyoverdines and Receptor Proteins of Pseudomonads, Current Topics in Medicinal Chemistry 1 (2001).
9. Fuchs R., Schäfer M., Geoffroy V., Meyer J.-M.*, Siderotyping - a powerful tool for the characterization of pyoverdines, Current Topics in Medicinal Chemistry 1 (2001) 31-57.
8. Schäfer M.*, Budzikiewicz H., A FAB- and MALDI-mass spectrometry study of doubly charged porphyrins, Journal of Mass Spectrometry 36 (2001) 1062-1068.
7. Cornelis P.*; Baysse C., De Vos D., Naudet Y., Meyer J.-M., Budzikiewicz H., Schäfer M., Fuchs R., Vanadium interferes with siderophore-mediated iron uptake in Pseudomonas aueruginosa, Microbiology 146 (2000) 2425-2434.
6. Siethoff C.*, Wagner-Redeker W., Schäfer M., Linscheid M., HPLC-MS with an Ion Trap Mass Spectrometer, Chimica 53 (1999) 484-491.
5. Weigmann H.-J.*, Lademann J., Pelchrzim R.v., Sterry W., Hagemeister T., Molzahn R., Schäfer M., Linscheid M., Schaefer H., Shah V.P., Bioavailability of Clobetasol Propionate-Quantification of Drug Concentrations in the Stratum Corneum by Dermatokinetics using Tape Stripping, Skin Pharmacology and Applied Skin Physiology 12 (1999) 46-53.
4. Schäfer M., Entwicklung eines tandem-massenspektrometrischen Screeningverfahrens zum Nachweis tricyclischer Antidepressiva und ihrer Metaboliten aus Körperflüssigkeiten, Shaker Verlag, Dissertation Universität Köln (1998) ISBN 3-8265-4206-1, pp.145.
3. Lenz C.*, Schäfer M., Budzikiewicz H., Improved ternary matrices for the analysis of Ferry-Pyoverdines by Fast Atom Bombardment Mass Spectrometry, Journal of Mass Spectrometry 33 (1998) 984-987.
2. Dallakian P., Benoni H., Schäfer M., Budzikiewicz H.*, Mass Spectrometric and Pyrolytic behaviour of some aryl sustituted Isoxazolines, Journal of Mass Spectrometry 33 (1998) 346-357.
1. Schäfer M.*, Budzikiewicz H., Brzezinka H., Schifferdecker M., A fast screening method for tricyclic antidepressants and their urinary metabolites by FAB-tandem mass spectrometry, Spectroscopy 13 (1997) 213-226.
Tagungsbeiträge von Professor Mathias Schäfer et al.
133. T. Salomon, D. Gupta, M. Bast, S. Marlton, S. Thorwirth, O. Asvany, M. Schäfer, S. Schlemmer, Protonated Diacetylene: Fermi Resonances at highest spectral resolution, GRC Meeting: Characterizing Small and Large Ions Using Experiment and Theory, February 22 - 27, 2026, Galveston, TX, USA.
132. Mathias Schäfer, Giel Berden, Jonathan Martens, Jos Oomens, Hui-Chung Wen, Wacharee Harnying, Albrecht Berkessel, Jana Roithová, Anthony J. H. M. Meijer, Curtius and Wolff Rearrangement Reactions investigated by Tandem-MS, IR Ion Spectroscopy (IRIS) and Theory, 56. Jahrestagung der DGMS, March 4 – 7, 2025 University of Göttingen.
131. H.-C. Wen, Thomas Piper , F. Wagener, J. Neudörfl, M. Thevis, M. Schäfer, Investigation Structures of In Vitro Phase I and In Vivo Rat Metabolites of a Novel 20-Keto-Steroid S42 by GC-MS Analysis and Chemical Synthesis, MDI Workshop, DSHS Köln, 17.2.-20.2.2025, Köln.
130. Hui‑Chung Wen, Tobias Wilczek, Jörg-M. Neudörfl, Felicitas Wagener, Thomas Piper, Mario Thevis, and Mathias Schäfer, A comprehensive GC-EI-HRMS study of a new steroidal selective androgen receptor modulator (SARM) compound S42, Pan Africa Chemistry Network PACN Congress 2024, 29 - 31 October 2024, Nairobi, Kenya.
129. Anthony J. H. M. Meijer, Mathias Schäfer, Mathias Paul, Thomas Thamulka, Wacharee Harnying, Jörg-Martin Neudörfl, Charlie R. Adams, Jonathan Martens, Giel Berden, Jos Oomens, and Albrecht Berkessel, Influence of C…H–C interactions on H-tunnelling inhydroxycarbenes, 24th EUROPEAN CONFERENCE ON THE DYNAMICS OF MOLECULAR SYSTEMS, 30 June-05 July 2024, Aarhus, Denmark.
128. Mathias Schäfer, Giel Berden, Jonathan Martens, Jos Oomens, Hui-Chung Wen, Wacharee Harnying, Albrecht Berkessel, Jana Roithová, Anthony J. H. M. Meijer Curtius and Wolff Rearrangement Reactions investigated by Tandem-MS, IR Ion Spectroscopy (IRIS) and Theory, INTERNATIONAL MASS SPECTROMETRY CONFERENCE 2024, AUGUST 17-23, 2024, MELBOURNE, AUSTRALIA.
127. MARCEL BAST, JULIAN BÖING, ELINE PLAAR, THOMAS SALOMON, MATHIAS SCHÄFER, IGOR SAVIC, OSKAR ASVANY, STEPHAN SCHLEMMER, SVEN THORWIRTH, ROTATIONAL SPECTROSCOPY OF NCCO+, 77th International Symposium on Molecular Spectroscopy, JUNE 17-21, 2024, University of Illinois at Urbana-Champaign, USA.
126. Leon Hünemeyer, Alessio di Ianni, Luisa Schmidt, Andrea Sinz, Markus Krüger, Mathias Schäfer, New CID cleavable cross-linkers suitable for IMAC enrichment and structure elucidation of proteins via MS, 55th ANNUAL CONFERENCE OF THE DGMS, March 10-13, 2024 | Freising, Germany.
125. Hui-Chung Wen, Felicitas Wagener, Thomas Piper, Jörg Neudörfl, Mario Thevis, Mathias Schäfer, Investigation Structures of In Vitro and In Vivo Metabolites of a Novel 20-Keto-Steroid S42 by LC/GC-MS Analysis and Organic Synthesis,55th ANNUAL CONFERENCE OF THE DGMS, March 10-13, 2024 | Freising, Germany.
124. T. Arndt, M. Breugst, M. Schäfer and D. Kuck, UNIDIRECTIONAL TRIPLE-HYDROGEN REARRANGEMENT:MECHANISM OF AN INTRAMOLECULAR REDOX REACTION, 40th INFORMAL MEETING ON MASS SPECTROMETRY IMMS, MAY 12H-15, 2024, Budapest, Hungary.
123. MARCEL BAST, JULIAN BÖING, THOMAS SALOMON, OSKAR ASVANY, IGOR SAVIC, SANDRA BRÜNKEN, MATHIAS SCHÄFER, SVEN THORWIRTH, STEPHAN SCHLEMMER, LEAK-OUT SPECTROSCOPY OF THE C-C STRETCHING MODES OF C3H+, NCCO+ AND HC3O+, 76th International Symposium on Molecular Spectroscopy, June 19-23, 2023, University of Illinois, Urbana-Champaign, IL, USA.
122. Hui-Chung Wen, Felicitas Wagener, Jörg Neudörfl, Mario Thevis, Mathias Schäfer, Investigation Phase I Metabolism of a NEW 20-Keto-Steroid S42 by C-6 Oxidation and GC-MS Analysis, 54th Annual Conference of the DGMS, May 14 – 17, 2023, Dortmund.
121. Leon Huenemeyer, Andrea Sinz, Mathias Schäfer, New CID cleavable cross-linkers suitable for IMAC enrichment and structure elucidation of proteins via MS, 54th Annual Conference of the DGMS, May 14 – 17, 2023, Dortmund.
120. Mathias Paul, Thomas Thomulka, Wacharee Harnying, Jörg-M. Neudörfl, Charlie Adams, Jonathan Martens, Giel Berden, Jos Oomens, Anthony J. H. M. Meijer, Albrecht Berkessel, and Mathias Schäfer, C:...H-C Hydrogen Bonding Shuts Down H-Tunneling in Hydroxycarbenes: A Gas-Phase Study by Tandem-MS, IR Ion Spectroscopy, and Theory, Faraday joint interest group conference 2023, 3.-5. April, University Sheffield, UK.
119. Mathias Paul, Thomas Thomulka, Wacharee Harnying, Jörg-M. Neudörfl, Charlie Adams, Jonathan Martens, Giel Berden, Jos Oomens, Anthony J. H. M. Meijer, Albrecht Berkessel, and Mathias Schäfer, C:...H-C Hydrogen Bonding Shuts Down H-Tunneling in Hydroxycarbenes: A Gas-Phase Study by Tandem-MS, IR Ion Spectroscopy, and Theory, Gordon Research Conference on Gaseous Ions: Structures, Energetics and Reactions, From Fundamentals to Emerging Applications, February 19 - 24, 2023, Ventura Beach, CA, USA.
118. Mathias Schäfer, Discussion Leader at the Gordon Research Conference on Gaseous Ions: Structures, Energetics and Reactions, From Fundamentals to Emerging Applications, February 19 - 24, 2023, Ventura Beach, CA, USA.
117. Hui-Chung Wen,* Tobias Wilczek, Hans-Günther Schmalz, Mario Thevis, Mathias Schäfer,GC-MS Analysis of a new 20-Keto-Steroid S42, IMSC 2022, Maastricht, the Netherlands, 27th August - 2nd September.
116. Dennis Zeh, Marcel Bast, Jonathan Martens, Giel Berden, Jos Oomens, Sandra Brünken, Stefan Schlemmer, Dietmar Kuck, Mathias Schäfer,* Unidirectional Double and Triple Hydrogen Rearrangement Reactions Probed by Infrared Ion Spectroscopy, IMSC 2022, Maastricht, the Netherlands, 27th August - 2nd September.
115. Mathias Schäfer, Carbene Chemistry in the Gas Phase: H-tunneling of hydroxycarbenes and intramolecular C...H-C interactions studied by IR ion spectroscopy, Tandem-MS and Theory, CHAINS 2020, https://nwochains.nl/, December 8.-9.2020.
114. Mathias Schäfer, Anthony Meijer, Thomas Thomulka, Katrin Peckelsen, Mathias Paul, Albrecht Berkessel, Jos Oomens, Giel Berden, Jonathan Martens, Hydrogen Tunneling in the gas phase investigated by MS, IR Ion Spectroscopy, and theory: first and latest results, , 53. DGMS Jahrestagung 2020, 1.3.-4.3.2020, Münster Germany. Keynote Lecture.
113. Dennis Zeh, Marcel Bast, Sven Thorwirth, Daniel Rap, Jörg Neudörfl, Aimee Camidiade, Dietmar Kuck, Sandra Brünken, Stefan Schlemmer, Mathias Schäfer, Mechanistic Investigations of Unidirectional Hydrogen Rearrangement Reactions in EI-MS, 53. DGMS Jahrestagung 2020, 1.3.-4.3.2020, Münster Germany.
112. Mathias Schäfer, Patrick Esch, Moritz Fischer, Sven Heiles, New chemical cross-linkers for Protein Structure Elucidation with switchable properties: stable upon Collision Induced Dissociation and cleavable by In-Source Paternò-Büchi Reactions, 53. DGMS Jahrestagung 2020, 1.3.-4.3.2020, Münster Germany.
111. Mathias Schäfer, Mathias Paul, Eric Detmar, Maria Schlangen, Martin Breugst, Jörg-Martin Neudörfl, Helmut Schwarz, Albrecht Berkessel, N-Heterocyclic Carbene (NHC) Dimerization in the Gas Phase: C-H···꞉C Hydrogen Bonding vs. Covalent Dimer Formation, ASIA-OCEANIA MASS SPECTROMETRY CONFERENCE, (AOMSC 2020), JANUARY 5-7, 2020, University of Macau, China. Invited Talk.
110. Mathias Schäfer, Thomas Thomulka, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Anthony J.H.M. Meijer, Albrecht Berkessel, Intramolecular C...H-C interactions can switch off H-tunneling reactivity of hydroxycarbenes; A gas-phase study by IR ion spectroscopy, Gordon Research Conference: From Small Atomic to Large Biomolecular Ions in Isolation, February 17 - 22, 2019, Ventura Beach, CA, USA.
109. Christian Ihling, Patrizia Springorum, Michael Götze, Christoph Hage, Mathias Schäfer, Andrea Sinz, Evaluation of an Isotope-Labeled MS/MS-Cleavable Cross-Linker for Protein Structure Analysis, 52. DGMS Jahrestagung 2019 in Rostock, 10.3.-13.3.2019.
108. Mathias Schäfer, Mathias Paul, Eric Detmar, Maria Schlangen, Martin Breugst, Jörg-Martin Neudörfl, Helmut Schwarz, Albrecht Berkessel, N-Heterocyclic Carbene (NHC) Dimerization in the Gas Phase: C-H···꞉C Hydrogen Bonding vs. Covalent Dimer Formation, 52. DGMS Jahrestagung 2019 in Rostock, 10.3.-13.3.2019.
107. Mathias Schäfer, Mathias Paul, Katrin Peckelsen, Jonathan Martens, Giel Berden, Jos Oomens, Albrecht Berkessel, Anthony J. H. M. Meijer, Hydroxycarbene Formation avoided: Excusive Formation of Enol Tautomers from a Phenyl Pyruvic Acid Derivative Evidenced by IR Ion Spectroscopy and Theory, RSC Faraday Discussion Advances in Ion Spectroscopy - From Astrophysics to Biology, York, UK, 8.4.-10.4.2019.
106. Patrizia Springorum, Michael Götze, Christoph Hage, Christian Ihling, Mathias Schäfer, Andrea Sinz, EVALUATION OF AN ISOTOPE-LABELED MS/MS-CLEAVABLE CROSS-LINKER FOR PROTEIN STRUCTURE ANALYSIS, ASMS Sanibel Meeting on Chemical Cross-Linking and Covalent Labeling, 24.- 27.2019, St. Petersburg, Fl, USA.
105. Mathias Schäfer, A close look on structure and reactivity of catalysts, metal-complexes and elusive reaction intermediates in the gas phase by Tandem-MS, and theory, PACN Seminar, October 4th 2018, Addis Ababa University, Ethiopia.
104. Mathias Schäfer, Mathias Paul, Katrin Peckelsen, Jonathan Martens, Jos Oomens, Giel Berden, Albrecht Berkessel, Anthony J. H. M. Meijer,Structure and Reactivity of Gas-Phase Phenylhydroxycarbenes: Hydrogen Tunneling at Room Temperature, Invited Hot Topic Talk, Bunsen Discussion Meeting on Gas-Phase Model Systems on Catalysis, 18.4.-20.4.2018, Ulm, Germany.
103. Katrin Peckelsen, Mathias Paul, Martin Breugst, Jonathan Martens, Giel Berden, Jos Oomens, Anthony J.H.M. Meijer, Albrecht Berkessel, Mathias Schäfer, IR Ion Spectroscopy of Key Intermediates of Carbene-Catalyzed Umpolung: Breslow Intermediates vs. Keto Tautomers, 51. DGMS Jahrestagung 2018, Saarbrücken, 11.3.-15.3.2018.
102. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jos Oomens, Giel Berden, Jonathan Martens, Anthony J.H.M. Meijer, Albrecht Berkessel, Characterization of the Key Intermediates of Carbene-Catalyzed Umpolung: Breslow Intermediates vs. Keto Tautomers, IBBI Conference, 4-2018, Texel, NL.
101. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Albrecht Berkessel, Anthony J. H. M. Meijer, Structure and Reactivity of Gas-Phase Phenylhydroxycarbenes: Hydrogen Tunneling at Room Temperature, 51. Jahrestagung der DGMS & European Mass Spectrometry Meeting, 11.3.-15.3.2018, Saarbrücken.
100. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Anthony J.H.M. Meijer, Albrecht Berkessel, Intramolecular C...H-C interactions can switch off H-tunneling reactivity of hydroxycarbenes; A gas-phase study by IR ion spectroscopy, ASMS Meeting, 6-2018, San Diego, CA, USA.
99. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Albrecht Berkessel, Anthony J. H. M. Meijer, Structure and Reactivity of Gas-Phase Phenylhydroxycarbenes: Hydrogen Tunneling at Room Temperature, bi-annual user meeting of the FELIX laboratory of Radboud University, Nijmegen, NL, 1.-3.11.2017.
98. Katrin Peckelsen, Jonathan Martens, Lisa Czympiel, Jos Oomens , Giel Berden, Dirk Gründemann, Anthony J. H. M. Meijer and Mathias Schäfer, Ergothioneine and related histidine derivatives in the gas phase: tautomer structures determined by IRMPD spectroscopy, bi-annual user meeting of the FELIX laboratory of Radboud University, Nijmegen, NL, 1.-3.11.2017.
97. Christian Arlt, Michael Götze, Christian Ihling, Mathias Schäfer, Andrea Sinz, An Integrated Workflow for Structural Proteomics Studies based on Cross-linking/Mass Spectrometry with an MS/MS Cleavable Cross-linker, 50. Jahrestagung der DGMS, 5.3.-8.3.2017, Kiel.
96. Adam Wutkowski, Navratan Bagwan, Matthias Krajewski, Bhesh Raj Paudyal, Ulrich E. Schaible, Mathias Schäfer, Dominik Schwudke, Software platform to improve the quality control of Lipid mediator quantification, 50. Jahrestagung der DGMS, 5.3.-8.3.2017, Kiel.
95. Christoph Hage, Mathias Schäfer, Andrea Sinz, Dissociation behavior of a TEMPO-benzyl cross-linker for peptide structure analysis by free radical initiated peptide sequencing (FRIPS) in negative ESI-MS, 50. Jahrestagung der DGMS, 5.3.-8.3.2017, Kiel.
94. Moritz Fischer, Christoph Hage, Mathias Schäfer, Andrea Sinz, Synthesis of Isotope-Labeled Derivatives of the MS/MS-Cleavable Urea-Cross-Linker: Synthesis and Evaluation of Reactivity for Effective Protein Structure Analysis, 50. Jahrestagung der DGMS, 5.3.-8.3.2017, Kiel.
93. Mathias Schäfer, "A close look on structure and reactivity of natural products, catalysts, metal-complexes and elusive reaction intermediates in the gas phase by Tandem-MS, IRMPD-spectroscopy and theory" OC/BC-Kolloquium TU Berlin, 5.1.2017.
92. Mathias Schäfer, Katrin Peckelsen, Mathias Paul, Jonathan Martens, Jos Oomens, Giel Berden, Albrecht Berkessel, Anthony J. H. M. Meijer, Structure and Reactivity of Gas-Phase Phenylhydroxycarbenes: Hydrogen Tunneling at Room Temperature, Gordon Research Conference on Gaseous Ions: Structures, Energetics & Reactions, February 12-17, 2017, Ventura, CA, USA.
91. Mathias Schäfer, Structure and Reactivity of Phenylhydroxycarbene studied in the Gas Phase: Hydrogen Tunneling at Room Temperature, International Mass Spectrometry Society Meeting, IMSC 2016, Toronto, Invited Talk, 20.-26.8.2016, CAN.
90. Rebecca Beveridge, Zsuzsanna Orbán-Németh, Mathias Schaefer, Jan-Michael Peters, Karl Mechtler, Assessing a CID-cleavable cross-linker ‘BuUrBu’ and subsequent data analysis strategies, 64th ASMS Conference on Mass Spectrometry and Allied Topics, 5.-9.6.2016, San Antonio, TX, USA.
89. Katrin Peckelsen, Anthony J. H. M. Meijer, Jos Oomens, Giel Berden, Jonathan Martens, Rob C. Dunbar, Mathias Schäfer, Gas-phase complexes of Ni2+ and Ca2+ with Histidine: Examination of Changes in Binding Motifs via Infrared Multiple Photon Dissociation (IRMPD) Spectroscopy, Isolated Biomolecules and Biomolecular Interactions IBBI 2016, 10.4.-15.2016, Oxford, UK.
88. Michael Götze, Jens Pettelkau, Christian Ihling, Mathias Schäfer, Andrea Sinz, Efficient Identification of Cross-Linked Peptides with StavroX and MeroX in Structural Proteomics, 49. Jahrestagung der DGMS, 28.2. – 2.3.2016, Hamburg.
87. Christoph Hage, Mathias Schäfer, Andrea Sinz,Dissociation behavior of a bifunctional TEMPO-benzyl active ester used for peptide structure analysis by free radical initiated peptide sequencing (FRIPS) mass spectrometry in negative ESI-MS, 49. Jahrestagung der DGMS, 28.2. – 2.3.2016, Hamburg.
86. Moritz Fischer, Andrea Sinz, Mathias Schäfer, Synthesis of Less Hydrophobic Derivatives of MS/MS-Cleavable Cross-Linkers: Synthesis and Evaluation of Reactivity for Effective Protein Structure Analysis, 49. Jahrestagung der DGMS, 28.2. – 2.3.2016, Hamburg.
85. Katrin Peckelsen, Anthony J. H. M. Meijer, Jos Oomens, Giel Berden, Jonathan Martens, Rob C. Dunbar, Mathias Schäfer, Examination of Gas-phase Cationic Ions of Histidine Complexes via Infrared Multiple Photon Dissociation (IRMPD) Spectroscopy, 49. Jahrestagung der DGMS, 28.2. – 2.3.2016, Hamburg.
84. Christian Arlt, Michael Götze, Christian H. Ihling, Mathias Schäfer, Andrea Sinz, An Integrated Workflow for Analysis of Proteins and Protein Complexes based on Cross-linking/Mass Spectrometry with an MS/MS Cleavable Cross-linker, 64th ASMS Conference on Mass Spectrometry and Allied Topics, 5.6.- 9.6.2016, San Antonio, TX, USA.
83. Mathias Schäfer, Christian Ihling, Francesco Falvo, Andrea Sinz, Evaluation of a bifunctional TEMPO-active ester reagent for peptide structure analysis by tandem mass spectrometry, Pacifichem 2015, 15.12. - 20.12.2015, Honolulu, HI, USA
82. Christoph Hage, Andrea Sinz, Mathias Schäfer, Dissociation behavior of a bifunctional TEMPO-benzyl active ester used for peptide structure analysis by free radical initiated peptide sequencing (FRIPS) mass spectrometry in negative ion mode, 5th Symposium on Structural Proteomics, November 19-20, 2015, Halle (Saale), Germany.
81. Moritz Fischer, Andrea Sinz Mathias Schäfer, Synthesis of less hydrophobic Derivatives of MS/MS-Cleavable Cross-Linkers: Synthesis and Evaluation of Reactivity for effective Protein Structure Analysis, 5th Symposium on Structural Proteomics, November 19-20, 2015, Halle (Saale), Germany.
80. Mathias Schäfer, A closer look on tautomers and conformers of histidine derivatives such as ergothioneine and hercynine in the gas phase, FELIX-User Meeting, 28.10. -30.10.2015, Radboud University Nijmegen, NL.
79. Mathias Schäfer, Dissociation Behavior of a Bifunctional TEMPO-Active Ester Reagent for Peptide Structure Analysis by Free Radical Initiated Peptide Sequencing (FRIPS) Mass Spectrometry, Jahrestagung der Deutschen Gesellschaft für Massen-spektrometrie DGMS 1.3.-4.3.2015, Wuppertal.
78. Christian Ihling, Michael Götze, Jens Pettelkau, Romy Fritzsche, Mathias Schäfer, Andrea Sinz, Automated Assignment of MS/MS Cleavable Cross-Links in Protein 3D-Structure Analysis, Jahrestagung der Deutschen Gesellschaft für Massen-spektrometrie DGMS DGMS 1.3.-4.3.2015, Wuppertal.
77. Mathias Schäfer, Christian Ihling, Francesco Falvo, Isabel Kratochvil, Andrea Sinz, Dissociation Behavior of a Bifunctional TEMPO-Active Ester Reagent for Peptide Structure Analysis by Free Radical Initiated Peptide Sequencing (FRIPS) Mass Spectrometry, 4th Symposium on Structural Proteomics SSP 2014, November 27th-28th, Antwerp, Belgium.
76. Mathias Schäfer, Homogeneous transition metal catalysis investigated in the gas phase: mechanistic studies of the Mizoroki-Heck coupling and the regioselective Diels-Alder reaction, Indian Society of Mass Spectrometry, ISMAS 28thSymposium cum Workshop on Mass Spectrometry, 9.3.-14.3.2014,Parwanoo, Himachal Pradesh INDIA.
75. Mathias Schäfer, Lukas Fiebig, Nils Schlörer, Hans-Günther Schmalz, Gas-phase Carbopalladation of Olefines with or without Ar/Ph Scrambling: An Investigation of Intermediate Phosphine Aryl Palladium Complex Ions. 62th ASMS Conference, Baltimore, MD, USA, 15.6.-19.6.2014.
74. Mathias Schäfer, Lukas Fiebig, Nils Schlörer, Hans-Günther Schmalz, Aryl-phenyl scrambling in intermediate organopalladium complexes. A gas-phase study of the Mizoroki-Heck reaction. Bunsentagung: Gas Phase Model Systems for Catalysis, Universität Ulm, 6.4.-9.4.2014.
73. Francesco Falvo, Lukas Fiebig, Mathias Schäfer, Presentation of a homobifunctional azo-reagent for protein structure analysis by collision-induced dissociative chemical cross-linking (XL): Proof-of-Principle, 47. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, Frankfurt, 02.-05.03.2014.
72. Christian Ihling, Francesco Falvo, Mathias Schäfer, Andrea Sinz, Evaluating the Potential of a MS/MS-Cleavable Cross-Linker for 3D-Structure Analysis of Protein Complexes, 47. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, Frankfurt, 02.-05.03.2014.
71. Lukas Fiebig, Nils Schlörer, Hans-Günther Schmalz, Mathias Schäfer, Aryl-phenyl scrambling in intermediate organopalladium complexes. A gas-phase study of the Mizoroki-Heck reaction, 47. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, Frankfurt, 02.-05.03.2014.
70. Mathias Schäfer, CID-labile Compounds as effective Reagents for Chemical cross linking (XL): Concepts and Examples, Vortrag, University Antwerpen, Belgium, 29.10.2013.
69. Mathias Schäfer, Sophisticated Mass Spectrometry Experiments for Ion Structure & Reactivity Investigations: A Closer Look with IRMPD Spectroscopy and Ion-Molecule Reactions, BioSupraMol Summer School: Mass Spectrometry in Supramolecular Chemistry and Biochemistry, FU Berlin, 18.-19.9.2013, Berlin, GER.
68. Lukas Fiebig, Julian Kuttner, Gerhard Hilt, Martin C. Schwarzer, Gernot Frenking, Hans-Günther Schmalz and Mathias Schäfer, Experimental Evidence and Characterization of Cobalt(I) Complexes important in regio-selective Diels-Alder Reactions. A Gas Phase Study, HPLC MS 2013, 16.6.-20.6.2013, Amsterdam, NL.
67. Evan T. Brower, Sandra B. Gabelli, Qing Wang, Raghothama Chaerkady, Christopher E. Berndsen, Robert N. Cole, Jonathan M. Backer, Mathias Schäfer, Andrea Sinz, Kenneth W. Kinzler, Bert Vogelstein, and L. Mario Amzel, The molecular architecture of p85α as determined by SAXS and chemical cross-linking, Annual Meeting of the American Association for Cancer Research AACR, 06.-10. April 2013, Washington, DC, USA.
66. Jens Pettelkau, Romy Fritzsche, Christian Ihling, Mathias Q. Müller, Frank Dreiocker, Mathias Schäfer, Andrea Sinz, Evaluating the Potential of an MS/MS-Cleavable Cross-Linker for 3D-Structure Analysis of Protein Complexes, 61st ASMS Conference on Mass Spectrometry and Allied Topics, 9.- 13. Juni 2013 Minneapolis, MN, USA.
65. Lukas Fiebig, Julian Kuttner, Gerhard Hilt, Martin C. Schwarzer, Gernot Frenking, Hans-Günther Schmalz and Mathias Schäfer, Experimental Evidence and Characterization of Cobalt(I) Complexes important in regio-selective Diels-Alder Reactions. A Gas Phase Study, 46. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 10.-13. März 2013, Berlin, Germany.
64. Francesco Falvo, Romy Fritzsche, Mathias Schäfer, Andrea Sinz, A tandem MS study of peptides derivatized with a thiourea-reagent designed for chemical cross-linking, 46. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 10.-13. März 2013, Berlin, Germany.
63. Radouane Nagim, Maxie Kohler, Martin R. Lenze, Jürgen Schelter, Vera Steinmann, Ronald Alle, Mathias Schäfer, Heike Klesper, Klaus Meerholz, Identifizierung von Verunreinigungen in organischen Solarzellen und deren Einfluss auf die Solarzellenperformance am Beispiel eines Merocyanin-Farbstoffes, 46. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 10.-13. März 2013, Berlin, Germany.
62. Lukas Fiebig, Julian Kuttner, Gerhard Hilt, Martin C. Schwarzer, Gernot Frenking, Hans-Günther Schmalz and Mathias Schäfer, Experimental Evidence and Characterization of Cobalt(I) Complexes important in regio-selective Diels-Alder Reactions. A Gas Phase Study, 61st ASMS Conference on Mass Spectrometry and Allied Topics, 9.- 13. Juni 2013 Minneapolis, MN, USA.
61. Mario Thevis, Simon Beuck, Andreas Thomas, Sebastian Höppner, Joseph Held, Mathias Schäfer, Jos Oomens, Wilhelm Schänzer, Mass Spectrometry in Sports Drug Testing: Investigating Diagnostic Product Ions of Testosterone by ESI-CID HRMS and IRMPD Spectroscopy, 60th ASMS Conference on Mass Spectrometry and Allied Topics Vancouver, BC, Canada, May 20 - 24, 2012.
60. Francesco Falvo, Lukas Fiebig, Frank Dreiocker, Ran Wang, P. B. Armentrout, Mathias Schäfer, In-depth examination of fragmentation reactions of thiourea- and urea-compounds by tandem MS-, energy-resolved CID experiments, and theory, 19th International Mass Spectrometry Conference IMSC, Kyoto, Japan, 15.9.-21.9.2012.
59. Lukas Fiebig, Hans-Günther Schmalz and Mathias Schäfer, Heck coupling in the gas phase: Examination of the reaction mechanism by ion/molecule reactions and mass spectrometry, 60th ASMS Conference on Mass Spectrometry and Allied Topics Vancouver, BC, Canada, May 20 - 24, 2012.
58. Lisa Brückmann, Wieland Tyrra, Sanjay Mathur, Giel Berden, Jos Oomens, Anthony J.H.M. Meijer and Mathias Schäfer, Examination of the coordination sphere of Al(III) in trifluoromethyl-heteroarylalkenolato-complex-ions by gas-phase IRMPD spectroscopy and computational modelling, 60th ASMS Conference on Mass Spectrometry and Allied Topics Vancouver, BC, Canada, May 20 - 24, 2012.
57. Frank Dreiocker, Simon Beuck, Nina Winkelmann, Mario Thevis, Andrea Sinz and Mathias Schäfer, XtraQuant: New dissociative reagents for efficient relative quantitation of proteins by tandem mass spectrometry using selected reaction monitoring, Joint Conference of the Polish Mass Spectrometry Society and German Mass Spectrometry Society 2012, 4.3.-7.3.2012, Poznan, Poland.
56. Francesco Falvo, Lukas Fiebig, Frank Dreiocker and Mathias Schäfer, In-depth examination of fragmentation reactions of thiourea- and urea-compounds important as CID-labile reagents for sensitive and effective chemical crosslinking, Joint Conference of the Polish Mass Spectrometry Society and German Mass Spectrometry Society 2012, 4.3.-7.3.2012, Poznan, Poland.
55. Lukas Fiebig, Hans-Günther Schmalz and Mathias Schäfer, Heck coupling in the gas phase: Examination of the reaction mechanism by ion/molecule reactions and mass spectrometry, Joint Conference of the Polish Mass Spectrometry Society and German Mass Spectrometry Society 2012, 4.3.-7.3.2012, Poznan, Poland.
54. Thevis Mario, Beuck Simon, Höppner Sebastian, Schäfer Mathias, Held Joseph, Oomens Jos, Thomas Andreas, Schänzer Wilhelm, Mass Spectrometry in Sports Drug Testing: Investigating Diagnostic Product Ions of Testosterone by ESI-CID HRMS and IRMPD spectroscopy, Joint Conference of the Polish Mass Spectrometry Society and German Mass Spectrometry Society 2012, 4.3.-7.3.2012, Poznan, Poland.
53. Mario Thevis, Simon Beuck, Sebastian Höppner, Mathias Schäfer, Joseph Held, Jos Oomens, Andreas Thomas, Wilhelm Schänzer, Mass Spectrometry in Sports Drug Testing: Investigating Diagnostic Product Ions of Testosterone by ESI-CID HRMS and IRMPD spectroscopy, Joint Conference of the Polish Mass Spectrometry Society and German Mass Spectrometry Society, March 4 - 7, 2012, Poznan, Polen.
52. Lukas Fiebig, Hans-Günther Schmalz and Mathias Schäfer, Analysis of homogenous Transition Metal Catalyst-Substrate Interactions in the Gas Phase using a high-Resolution Orbitrap Mass Analyzer, 17th European Symposium on Organic Chemistry (ESOC 2011) 10.7.-15.7.2011, Hersonissos, Crete, Greece.
51. Frank Dreiocker, Jos Oomens, Anthony J.H.M. Meijer, Barry T. Pickup,Richard F.W. Jackson and Mathias Schäfer, MS- and IRMPD-study of Solvated Organozinc Cations in the Gas Phase: Structure Elucidation of Negishi Cross Coupling Reagents, ASMS Conference on Mass Spectrometry and Allied Topics, 5.6.-9.6.2011, Denver, USA.
50. Frank Dreiocker, Andrew J. Ross, Jos Oomens, Anthony J. H. M. Meijer, Barry T. Pickup, Richard F. W. Jackson and Mathias Schäfer, Structure elucidation of tetramethylethylenediamine (TMEDA) solvated organozinc cations in the gas phase, 44. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 27.02.-02.03.2011, ISAS, Dortmund.
49. Francesco Falvo, Frank Dreiocker and Mathias Schäfer, Tandem-MS study of the fragmentation behavior of thiourea- and urea-compounds, 44. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 27.02.-02.03.2011, ISAS, Dortmund.
48. Lukas Fiebig, Hans-Günther Schmalz and Mathias Schäfer, Analysis of homogenous Transition Metal Catalyst-Substrate Interactions in the Gas Phase using a high-Resolution Orbitrap Mass Analyzer, 44. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 27.02.-02.03.2011, ISAS, Dortmund.
47. Mathias Schäfer, Miriam K. Drayß, P.B. Armentrout and Jos Oomens, Alkali metal cationized aliphatic amino acids: charge-solvation becomes more favorable with increasing ion size, Isolated biomolecules and biomolecular interactions, IBBI 2010 Conference, 12.-17.6.2010, Fritz-Haber-Institut Berlin.
46. Mathias Q. Müller, Frank Dreiocker, Mathias Schäfer, and Andrea Sinz A Novel Cleavable Cross-Linker for Protein Structure Analysis Constant Neutral Losses Simplify Identification of Cross-Linking Products, Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS 2010, 7.-10.3.2010, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale).
45. Jos Oomens, Miriam Drayss, Peter B. Armentrout, Mathias Schäfer, Alkali metal cationized aliphatic amino acids: Charge-solvation becomes more favorable with increasing ion size, 58th ASMS Conference on Mass Spectrometry and Allied Topics, 23.5.- 27.5.2010, Salt Lake City, Utah, USA.
44. Mathias Schäfer, Ionenspektroskopie mit IRMPD, Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS 2010, 7.-10.3.2010,Martin-Luther-Universität Halle-Wittenberg, Halle (Saale).
43. Frank Dreiocker, Mathias Müller, Andrea Sinz, Mathias Schäfer, Neue dissoziative Cross-Linker für die vereinfachte massenspektrometrische Proteinstrukturaufklärung, 43. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie DGMS, 7.-10.3.2010 Halle (Saale).
42. Andrea Sinz, Frank Dreiocker, Mathias Q. Müller, Christian Ihling, Mathias Schäfer, COLLISION-INDUCED DISSOCIATIVE CHEMICAL CROSS-LINKING REAGENTS AND ESI-LTQ-ORBITRAP-MS FOR PROTEIN STRUCTURE CHARACTERIZATION, 9th European Fourier Transform Mass Spectrometry EFTMS Workshop, 6 - 9 April, 2010, Lausanne, Switzerland.
41. Miriam K. Drayß, Dirk Blunk, Jos Oomens, Peter Armentrout, Mathias Schäfer, Infrared Multiphoton Dissociation Spectroscopy of Cationized Proline and N-Methyl Alanine: Effects of Alkali-Metal Cation Size on Gas-Phase Conformation, 25th Asilomar Conference on Mass Spectrometry, October 16.-20. 2009, Pacific Grove, CA, USA.
40. Schäfer, Mathias; Dreiocker, Frank; Oomens, Jos; Jackson, Richard F. W.; Meijer, Anthony J.H.M.; Pickup, Barry T., Gas-phase examination of alkylzinc dimethylformamide cluster ions: key intermediates in the stereo-controlled synthesis of non-natural amino acids, 18th International Mass Spectrometry Conference IMSC 2009, 30.8-4.9.2009, Bremen, Germany.
39. Klesper, Heike; Nagim, Radouane; Schäfer, Mathias; Meerholz, Klaus; Low flow ESI LC-MS method for the analysis of degradation products and impurities in unpolar compounds used for organic electronics, 18th International Mass Spectrometry Conference IMSC 2009, 30.8-4.9.2009, Bremen, Germany.
38. Dreiocker, Frank; Müller, Mathias; Sinz, Andrea; Schäfer, Mathias, New dissociative cross-linker for effective protein structure elucidation by tandem mass spectrometry, 18th International Mass Spectrometry Conference IMSC 2009, 30.8-4.9.2009, Bremen, Germany.
37. Thevis, Mario; Beuck, Simon; Kohler, Maxie; Thomas, Andreas; Schäfer, Mathias; Schänzer, Wilhelm, Mass Spectrometry-Based Detection of New Drugs and Methods of Manipulation in Doping Control Analysis, 18th International Mass Spectrometry Conference IMSC 2009, 30.8-4.9.2009, Bremen, Germany.
36. Mathias Schäfer, Frank Dreiocker, Jos Oomens, Richard F.W. Jackson, Anthony J.H.M. Meijer, Barry T. Pickup, Gas-phase examination of alkylzinc dimethylformamide cluster ions: key intermediates in the stereo-controlled synthesis of non-natural amino acids, 42. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Universität Konstanz, 8.-11. März 2009.
35. Miriam Drayß, Dirk Blunk, Frank Dreiocker, Jeremiah M. Purcell, Christopher L. Hendrickson, Alan G. Marshall, Jos Oomens, Peter Armentrout, Abhigya Mookherjee, Mathias Schäfer, Untersuchung von [M + K]+ Molekülionen tertiärer Aminosäuren in der Gasphase: Molecular Modelling und Infrared Multi Photon Dissociation Spectroscopy (CO2-Laser IRMPD und Free Electron Laser for Infrared Experiments), 42. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Universität Konstanz, 8.-11. März 2009.
34. H. Moll, A. Johnsson, M. Schäfer, M. Glorius, K. Pedersen, H. Budzikiewicz, G. Bernhard, Complexation of Neptunium (V) with Pyoverdins, Migration '09, 12th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 20.9.- 25.9. Kennewick, Washington, USA 2009.
33. Miriam Drayß, Dirk Blunk, Frank Dreiocker, Jeremiah M. Purcell, Christopher L. Hendrickson, Alan G. Marshall, Jos Oomens, Abhingya Mookherjee, Peter Armentrout, Mathias Schäfer, Potassium affinity of gas-phase amino acids determined by IRMPD (CO2- and Free Electron Laser) and molecular modelling, 57th ASMS Conference on Mass Spectrometry, 31.5.– 4.6.2009, Philadelphia PA, USA 2009.
32. Mario Thevis; Simon Beuck; Andreas Thomas; Maxie Kohler; Mathias Schäfer; Wilhelm Schänzer, Mass Spectrometry in Sports Drug Testing: Characterization and Detection of RYCALs – Endurance-Enhancing Ryanodine-Calstabin-Complex Stabilizers, 57th ASMS Conference on Mass Spectrometry, 31.5.-4.6.2009, Philadelphia PA, USA 2009.
31. Mathias Schäfer, Miriam Drayß, Dirk Blunk, Carsten Schmuck, Jos Oomens, Nick Polfer, Bing Gao, Thomas Wyttenbach, Michael Bowers, Structures of guanidiniocarbonylpyrrole-derivative ions in the gas phase examined by MS/MS, FELIX induced photo-dissociation spectroscopy, Ion Mobility-MS and computational modelling, ISOLATED BIOMOLECULES AND BIOMOLECULAR INTERACTIONS, IBBI08, Valladolid, Spain, 13-18.4.2008.
30. Mathias Schäfer, Miriam Drayß, Dirk Blunk, Carsten Schmuck, Jos Oomens, Nick Polfer, Bing Gao, Thomas Wyttenbach, Michael Bowers, Structures of guanidiniocarbonylpyrrole-derivative ions in the gas phase examined by MS/MS, FELIX induced photo-dissociation spectroscopy, Ion Mobility-MS and computational modelling, 13th ISMAS Symposium cum Workshop on Mass Spectrometry, BARC Training School, Anushakti Nagar, Mumbai, 27.1.-31.1. 2008.
29. Mathias Schäfer, Prozesse der Erzeugung von Gasphasenionen mit Hilfe der Elektrosprayionisierung, 41. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Justus-Liebig-Universität Gießen, 2.-5. März 2008.
28. Frank Dreiocker, Herbert Budzikiewicz, Mathias Schäfer, MS/MS-Untersuchung des Verlusts von Silberhydrid aus [M+Ag]+ Vorläuferionen unsymmetrischer tertiärer Amine und tertiärer Aminocarbonsäuren, 41. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Justus-Liebig-Universität Gießen, 2.-5. März 2008.
27. Miriam Drayß, Mathias Schäfer, Carsten Schmuck, Dirk Blunk, Nick C. Polfer, Jos Oomens, Michael T. Bowers, Thomas Wyttenbach, Bing Gao, Examination of the Gas-Phase Ion Structure of Cationized Guanidiniocarbonyl Pyrrole Derivates (Na+) by Infrared Multi Photon Dissociation Spectroscopy (IRMPD), Computational Modelling and Ion Mobility Spectroscopy, 41. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Justus-Liebig-Universität Gießen, 2.-5. März 2008.
26. Mathias Schäfer, Andreas Springer, Philipp Zacharias, Klaus Meerholz, Electrospray Mass Spectrometry and ES-MS/MS of hole-transport materials: formation of open-shell molecular radical cations and remarkable MSn fragmentation behaviour, 55th ASMS Conference on Mass Spectrometry, 3.6.- 7.6.2007, IndianapolisIN, USA2007.
25. Miriam Drayß, Mathias Schäfer, Carsten Schmuck, Dirk Blunk, Nick C. Polfer, Jos Oomens, Sebastian Schlund, Bernd Engels, Examination of gas-phase Ion Structures of Cationized Guanidiniocarbonyl pyrroles by Infrared multi Photon Dissociation Spectroscopy (IRMPD) and Computational Modeling, 55th ASMS Conference on Mass Spectrometry, 3.6.–7.6.2007, Indianapolis IN, USA 2007.
24. Mathias Schäfer, Electrospray-MS/MS: Ion Formation, Collision Activation and Fragmentation Reactions of Organic and Bioorganic Compounds, 12th ISMAS Symposium cum Workshop on Mass Spectrometry, March 25th-30th,Dona Paula, Goa, India, 2007.
23. Frank Dreiocker , Mathias Schäfer, Juri Rappsilber, Proteinstrukturaufklärung unter Verwendung Tandem-massenspektrometrisch selektiv nachweisbarer Crosslinker¸ 40. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Universität Bremen, 11. – 14. März 2007.
22. Miriam Drayß, Mathias Schäfer, Carsten Schmuck, Dirk Blunk, Nick C. Polver, Jos Oomens, Examination of the gas-phase Ion Structure of Cationized Guanidiniocarbonyl pyrrole derivates (Na+) by Infrared multi Photon Dissociation Spectroscopy (IRMPD) and Computational Modelling, 40. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS, Universität Bremen, 11. – 14. März 2007.
21. H. Moll, A. Johnsson, M. Schäfer, M. Glorius, K. Pedersen, H. Budzikiewicz, G. Bernhard, Complexation of actinides with bioligands secreted by a subsurface strain of Pseudomonas fluorescens, Migration 2007, August 26-31, Munich, Germany, 2007.
20. Mathias Schäfer, Nick C. Polfer, Jos Oomens, Dirk Blunk, Matthew Forbes, Rebecca A. Jockusch, Examination of the gas-phase ion structure of cationized arginine (Na+, K+) by infrared multi photon dissociation spectroscopy and computational modeling, 54rd ASMS Conference on Mass Spectrometry and Allied Topics, Seattle WA, USA, 2006.
19. Mathias Schäfer, Regine Fuchs, Herbert Budzikiewicz, Andreas Springer, Michael Linscheid, Jean-Marie Meier, Tandem-MS Studie von Peptiden mit cyclischen Substrukturen: Aufklärung von skeletteralen Umlagerungsreaktionen bei CID in Quadrupol- und magnetischen Ionenfallen & Ermittlung der Primärstruktur, 39. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS 2006, Universität Mainz, 05. bis 08. März, 2006.
18. Schäfer M., Springer A., Linscheid M., Fuchs R., Budzikiewicz H., MSn-Characterization and exact mass measurement of MS2-fragmentions of a peptide with a cyclic substructure: Examination of fragmentation and rearrangement reactions, 53rd ASMS Conference on Mass Spectrometry and Allied Topics, San Antonio TX, USA, 2005.
17. Silberbach M., Schäfer M., Hüser A., Kalinowski J., Pühler A., Krämer R.,Burkovski A.: The respones of Corynebacterium glutamicum to nitrogen limitation, BioPerspectives, Wiesbaden, 10.05.-12.05.2005.
16. Silberbach M., Schäfer M., Krämer R., Burkovski A.: Global analysis of the response to nitrogen limitation in Corynebacterium glutamicum using DNA microarrays and 2-D-PAGE. Dechema Statusseminar Chiptechnologien, Frankfurt a.M., 03.02.-04.02.2005.
15. Schäfer M., Gross J., Spektreninterpretation, Thermo Electron LC-MS Anwenderforum, Göttingen, Germany, 5.10.2004.
14. Schäfer M., Schmuck C., Geiger L., Hendrickson C.L., Chalmers M.J., Marshall A.G., Structurally related non-covalent complexes examined by quadrupole ion trap (QIT) MS2 and infrared multiphoton dissociation Fourier transform ion cyclotron resonance mass spectrometry (IRMPD-FT-ICR MS): evidence for salt-bridge structures in the gas phase, 52th ASMS Conference on Mass Spectrometry and Allied Topics, Nashville TN, USA, 2004.
13. Schäfer M., Schmuck C., Heil M., Cooper H.J., Hendrickson C.L., Chalmers M.J., Marshall A.G., Determination of the gas-phase activation energy for the unimolecular dissociation of a non-covalent complex by infrared multiphoton dissociation tandem Fourier transform ion cyclotron resonance mass spectrometry, 51th ASMS Conference on Mass Spectrometry and Allied Topics, Montreal, Canada, 2003.
12. Bellahn I., Krämer R., Waffenschmidt S., Schäfer M., Proteome analysis of the vacuole of Saccharomyces cerevisiae, Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS 2002, DKFZ Heidelberg, 03. bis 06. März, 2002.
11. Uría Fernández D., Schäfer M., Budzikiewicz H., Heim S., Möglichkeiten und Grenzen von MALDI-MS Fingerprints am Beispiel der Strukturaufklärung eines Membranproteins von Pseudomonas fluorescens G173, Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS 2002, DKFZ Heidelberg, 03. bis 06. März, 2002.
10. Silberbach M.M., Bendt A.K., Krämer R., Schäfer M., Burkovski A., Proteome analysis of Corynebacterium glutamicum, Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie, DGMS 2002, DKFZ Heidelberg, 03.bis 06.März, 2002.
9. Schäfer M., Schmickler H., Budzikiewicz H., Fuchs R., Strukturaufklärung von Methaboliten des Antidepressivums Opipramol mittels MS/MS, LC-MSn und NMR; XIII. Massenspektrometische Diskussionsveranstaltung, Universität Wien, Austria 19.-20. Februar 2002.
8. Ongena M., Schäfer M., Budzikiewicz H., Jacques P., Dommes J., Thonart P., Isolation of new metabolites from Pseudomonas putida involved in plant resistance induction, PSEUDOMONAS 2001, Brussels, Belgium, 2001.
7. Uría Fernández D., Budzikiewicz H., Taraz K., Schäfer M., Fast Characterisation of the different siderophores of pseudomonas fluorescens G173, PSEUDOMONAS2001, Brussels/Belgium, 2001.
6. Schäfer M., Hohlneicher U., Fuchs R., Budzikiewicz H., Examination of the biosynthetic pathway of Pseudomonas Siderophores by means of MSn-Ion-Trap experiments, 49thASMS Conference on Mass Spectrometry and Allied Topics, Chicago IL, USA, 2000.
5. Schäfer M., Budzikiewicz H., A mass spectrometric study of doubly charged porphyrins, 48th ASMS Conference on Mass Spectrometry and Allied Topics, Long Beach CA, USA, 2000.
4. Cornelis P.; Baysse C., De Vos D., Naudet Y., Meyer J.-M., Budzikiewicz H., Schäfer M., Fuchs R., Vanadium interferes with siderophore-mediated iron uptake in Pseudomonas aueruginosa, 2. International Biometals Symposium, Tübingen, Germany, 2000.
3. Schäfer M., Hagemeister T., Molzahn R., Linscheid M., Weigmann H.-J., Lademann J., Pelchrzim R. v., Sterry W., Determination of Clobetasol Propionate in Stratum Corneum Extracts by Means of HPLC and LC-MS, Jahrestagung DGMS, Oldenburg, Deutschland, 1999.
2. Schäfer M., Hagemeister T., Molzahn R., Linscheid M., Weigmann H.-J., Lademann J., Pelchrzim R. v., Sterry W., Determination of Clobetasol Propionate in Stratum Corneum Extracts by Means of HPLC and LC-MS, Proceedings 47th ASMS Conf. Mass Spectrom. Allied Topics, Dallas TX, USA, 1999.
1. Budzikiewicz H., Bold P., Schäfer M., Dallakian P., Brzezinka H., Screening procedures for drugs in body fluids, Proceedings ASMS 45th Conf. Mass Spectrom. Allied Topics, Palm Springs CA, USA (1997) 1095.