• 2021
• 2018
• 2017
• 2016
• 2015
• 2014
• 2013
• 2012
• 2011
• 2010
• 2009
• 2008
• 2007
• 2006
• 2005
• 2004
• 2003
• 2002
• 2001
• 2000
• 1995

2021

• Fraschetti C.,* Letzel M. C., Paletta M., Mattay J., Crestoni M.E., Chiavarino B., Filippi A. Unprotected Galactosamine as a Dynamic Key for a Cyclochiral Lock. J. Am. Soc. Mass Spectrom.. 2021; 2021(24): 736-743. doi: 10.1021/jasms.0c00437.

2018

• Kuck D., Heitkamp S., Letzel M., Ahmed I., Krohn K. Consecutive loss of two benzyl radicals from the [M + Na]+ adduct ions of pyrogallol tribenzyl ether and its derivatives. European Journal of Mass Spectrometry. 2018; 24(1): 23-32. doi: 10.1177/1469066717729300.

2017

• Letzel M C, Schäfer H-J, Fröhlich R. Diastereoselective anodic hetero- and homo-coupling of menthol-, 8-methylmenthol- and 8-phenylmenthol-2-alkylmalonates. Beilstein Journal of Organic Chemistry. 2017; 13(null): 33-42. doi: 10.3762/bjoc.13.5.
• Tesch M, Kudruk S, Letzel M, Studer A. Orthogonal Click Postfunctionalization of Alternating Copolymers Prepared by Nitroxide-Mediated Polymerization. Chemistry - A European Journal. 2017; 23(25): 5915-5919. doi: 10.1002/chem.201605639.
• Thierbach S., Birmes F., Letzel M., Hennecke U., Fetzner S. Chemical Modification and Detoxification of the Pseudomonas aeruginosa Toxin 2-Heptyl-4-hydroxyquinoline N-Oxide by Environmental and Pathogenic Bacteria. ACS Chemical Biology. 2017; 12(9): 2305-2312. doi: 10.1021/acschembio.7b00345.

2016

• Elghamry I., El-Ayaan U., Youssef M., Al-Shihry S., Letzel M., Mattay J. Photochemical and DNA degradation studies on tenoxicam, lornoxicam, and their photolysis products. Monatshefte fur Chemie. 2016; 2016: 1-6. doi: 10.1007/s00706-016-1765-z.
• Hickert S., Cramer B., Letzel M., Humpf H. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry imaging of ochratoxin A and fumonisins in mold-infected food. Rapid Communications in Mass Spectrometry. 2016; 30(23): 2508-2516. doi: 10.1002/rcm.7733.
• Mitra R., Thiele M., Octa-Smolin F., Letzel M., Niemeyer J. A bifunctional chiral [2]catenane based on 1,1′-binaphthyl-phosphates. Chemical Communications. 2016; 52(35): 5977-5980. doi: 10.1039/c6cc01980c.

2015

• Kuck D., Heitkamp S., Sproß J., Letzel M., Ahmed I., Krohn K., Parker R., Wang Y., Robbins V., Ames W., Schettler P., Hark R. Consecutive losses of two benzyl radicals from the [M+Na]⁺ adduct ions of di- and tri(benzyloxy)benzenes under ESI/CID conditions. International Journal of Mass Spectrometry. 2015; 377(1): 23-38. doi: 10.1016/j.ijms.2014.06.013.
• Radunsky C, Kösters J, Letzel MC, Yogendra S, Schwickert C, Manck S, Sarkar B, Pöttgen R, Weigand JJ, Neugebauer J, Müller J. Dioxygen Activation by an in situ Reduced Cu^II Hydrazone Complex. European Journal of Inorganic Chemistry. 2015; 2015: 4006-4012. doi: 10.1002/ejic.201500556.
• Tesch M., Hepperle J., Klaasen H., Letzel M., Studer A. Alternating copolymerization by nitroxide-mediated polymerization and subsequent orthogonal functionalization. Angewandte Chemie - International Edition. 2015; 54(17): 5054-5059. doi: 10.1002/anie.201412206.
• Volkenhoff A., Weiler A., Letzel M., Stehling M., Klämbt C., Schirmeier S. Glial glycolysis is essential for neuronal survival in drosophila. Cell Metabolism. 2015; 22(3): 437-447. doi: 10.1016/j.cmet.2015.07.006.

2014

• Kuck D., Heitkamp S., Sproß J., Letzel M., Ahmed I., Krohn K., Parker R., Wang Y., Robbins V., Ames W., Schettler P., Hark R. Consecutive losses of two benzyl radicals from the [M + Na]+ adduct ions of di- and tri(benzyloxy)benzenes under ESI/CID conditions. International Journal of Mass Spectrometry. 2014; null(null). doi: 10.1016/j.ijms.2014.06.013.
• Kuck D., Salameh L., Onwuka K., Letzel M. Unidirectional triple hydrogen rearrangement in the radical cations of electron-rich 3-aryl-1-propanols: Further evidence and limitation. European Journal of Mass Spectrometry. 2014; 20(1): 51-61. doi: 10.1255/ejms.1239.
• Pirkl A., Meier M., Popkova Y., Letzel M., Schnapp A., Schiller J., Dreisewerd K. Analysis of free fatty acids by ultraviolet laser desorption ionization mass spectrometry using insect wings as hydrophobic sample substrates. Analytical Chemistry. 2014; 86(21): 10763-10771. doi: 10.1021/ac5020047.

2013

• Letzel M., Barth D., Kuck D., Grützmacher H., Kim S., Yim M., Choe J. Unimolecular reactions of gaseous picoline radical cations. A new experimental and computational study. International Journal of Mass Spectrometry. 2013; 336(null): 1-16. doi: 10.1016/j.ijms.2012.11.005.
• Rozhenko A., Schoeller W., Letzel M., Decker B., Mattay J. Anion-π interactions in adducts of anionic guests with octahydroxy-pyridine[4]arene: Theoretical and experimental elucidation. New Journal of Chemistry. 2013; 37(2): 356-365. doi: 10.1039/c2nj40670e.

2012

• Amick A., Hoegg E., Harrison S., Houston K., Hark R., Reingold I., Barth D., Letzel M., Kuck D. Site-specific hydrogen exchange and hydrogen transfer processes preceding the fragmentation of long-lived radical cations of ethyl dihydrocinnamate and related arylalkanoates. International Journal of Mass Spectrometry. 2012; null(null): 206-215. doi: 10.1016/j.ijms.2012.01.005.
• Fraschetti C., Letzel M., Filippi A., Speranza M., Mattay J. Enantioselective supramolecular devices in the gas phase. Resorcin[4]arene as a model system. Beilstein Journal of Organic Chemistry. 2012; 8(null): 539-550. doi: 10.3762/bjoc.8.62.
• Fraschetti C., Letzel M., Paletta M., Mattay J., Speranza M., Filippi A., Aschi M., Rozhenko A. Cyclochiral resorcin[4]arenes as effective enantioselectors in the gas phase. Journal of Mass Spectrometry. 2012; 47(1): 72-78. doi: 10.1002/jms.2028.

2011

• Botta B., Fraschetti C., D'Acquarica I., Sacco F., Mattay J., Letzel M., Speranza M. Unprecedented gas-phase chiroselective logic gates. Organic and Biomolecular Chemistry. 2011; 9(6): 1717-1719. doi: 10.1039/c0ob00664e.
• Kuck D., Grützmacher H., Barth D., Heitkamp S., Letzel M. The role of ion/neutral complexes in the fragmentation of N-benzyl-(alkylpyridinium) ions. International Journal of Mass Spectrometry. 2011; 306(null): 159-166. doi: 10.1016/j.ijms.2010.10.006.
• Kuck D., Matthias C., Barth D., Letzel M. Isomerization of the constituents of ion/neutral complexes during the fragmentation of protonated dialkyl-substituted 1,3-diphenylpropanes. International Journal of Mass Spectrometry. 2011; 306(null): 167-174. doi: 10.1016/j.ijms.2010.10.007.

2010

• Krohn K., Ahmed I., John M., Letzel M., Kuck D. Stereoselective synthesis of benzylated prodelphinidins and their diastereomers with use of the mitsunobu reaction in the preparation of their gallocatechin precursors. European Journal of Organic Chemistry. 2010; null(13): 2544-2554. doi: 10.1002/ejoc.201000053.

2009

• Botta B., Fraschetti C., D'Acquarica I., Speranza M., Novara F., Mattay J., Letzel M. Gas-Phase enantioselectivity of chiral N-Linked peptidoresorc[4]arene isomers toward dipeptides. Journal of Physical Chemistry A. 2009; 113(52): 14625-14629. doi: 10.1021/jp904374h.
• Botta B., Fraschetti C., Novara F., Tafi A., Sacco F., Mannina L., Sobolev A., Mattay J., Letzel M., Speranza M. Interactions of vinca alkaloid subunits with chiral amido[4]resorcinarenes: A dynamic, kinetic, and spectroscopic study. Organic and Biomolecular Chemistry. 2009; 7(9): 1798-1806. doi: 10.1039/b900735k.
• Böcker S., Letzel M., Lipták Z., Pervukhin A. SIRIUS: Decomposing isotope patterns for metabolite identification. Bioinformatics. 2009; 25(2): 218-224. doi: 10.1093/bioinformatics/btn603.
• Sekiguchi O., Meyer V., Letzel M., Kuck D., Uggerud E. Energetics and reaction mechanisms for the competitive losses of H 2, CH4 and C2H4 from protonated methylbenzenes-implications to the methanol-to-hydrocarbons (MTH) process. European Journal of Mass Spectrometry. 2009; 15(2): 167-181. doi: 10.1255/ejms.953.

2008

• Igoli J., Onyiriuka S., Letzel M., Nwaji M., Gray A. Cassane diterpenoids from Lonchocarpus laxiflorus. Natural Product Communications. 2008; 3(1): 5-10.
• König H., Marsmann H., Letzel M. Thioether Functionalized Octasilsesquioxanes. In: Auner Norbert, Weis Johann, editors. : Organosilicon Chemistry I: From Molecules to Materials. 2008 S. 425-428. doi: 10.1002/9783527620777.ch69d.
• Letzel M., Grützmacher H., Stein D., Grützmacher H. Trends in the reactions of gaseous phenyl pnictogen radical cations C 6H5EH2̇+ (E = N, P, As). Dalton Transactions. 2008; null(25): 3282-3291. doi: 10.1039/b801970c.
• Letzel M., Schäfer C., Novara F., Speranza M., Rozhenko A., Schoeller W., Mattay J. A kinetic study of guest displacement reactions on a host-guest complex with a photoswitchable calixarene. Journal of Mass Spectrometry. 2008; 43(11): 1553-1564. doi: 10.1002/jms.1464.
• Schröder T., Brodbeck R., Letzel M., Mix A., Schnatwinkel B., Tonigold M., Volkmer D., Mattay J. A self-assembling metallosupramolecular cage based on cavitand-terpyridine subunits. Tetrahedron Letters. 2008; 49(41): 5939-5942. doi: 10.1016/j.tetlet.2008.07.143.

2007

• Botta B., D'Acquarica I., Nevola L., Sacco F., Lopez Z., Zappia G., Fraschetti C., Speranza M., Tafi A., Caporuscio F., Letzel M., Mattay J. Bis(diamido)-bridged basket resorcin[4]arenes as enantioselective receptors for amino acids and amines. European Journal of Organic Chemistry. 2007; null(36): 5995-6002. doi: 10.1002/ejoc.200700829.

2006

• Böcker S., Letzel M., Lipták Z., Pervukhin A. Decomposing metabolomic isotope patterns. Proccedings of the 6th International Workshop on Algorithms in Bioinformatics, WABI 2006; Zurich, che. 2006. . S. 12-23.
• Letzel M., Kirchhoff D., Grützmacher H., Stein D., Grützmacher H. Isomerization and fragmentation reactions of gaseous phenylarsane radical cations and phenylarsanyl cations. A study by tandem mass spectrometry and theoretical calculations. Dalton Transactions. 2006; null(16): 2008-2016. doi: 10.1039/b514312h.
• Rozhenko A., Schoeller W., Letzel M., Decker B., Agena C., Mattay J. Calixarenes as hosts for ammonium cations: A quantum chemical study and mass-spectrometric investigations. Chemistry - A European Journal. 2006; 12(35): 8995-9000. doi: 10.1002/chem.200501520.
• Schäfer C., Decker B., Letzel M., Novara F., Eckel R., Ros R., Anselmetti D., Mattay J. On the way to supramolecular photochemistry at the single-molecule level. Pure and Applied Chemistry. 2006; 78(12): 2247-2259. doi: 10.1351/pac200678122247.
• Sekiguchi O., Letzel M., Kuck D., Uggerud E. The unimolecular dissociation of protonated glyoxylic acid: Structure and dynamics of a step-by-step process. International Journal of Mass Spectrometry. 2006; null(null): 177-184. doi: 10.1016/j.ijms.2005.12.041.
• Svelle S., Bjørgen M., Kolboe S., Kuck D., Letzel M., Olsbye U., Sekiguchi O., Uggerud E. Intermediates in the methanol-to-hydrocarbons (MTH) reaction: A gas phase study of the unimolecular reactivity of multiply methylated benzenium cations. Catalysis Letters. 2006; 109(null): 25-35. doi: 10.1007/s10562-006-0052-8.

2005

• Rozhenko A., Schoeller W., Letzel M., Decker B., Agena C., Mattay J. Conformational features of calix[4]arenes with alkali metal cations: A quantum chemical investigation with density functional theory. Journal of Molecular Structure: THEOCHEM. 2005; 732(null): 7-20. doi: 10.1016/j.theochem.2005.06.041.
• Schulte T, Siegenthaler KO, Luftmann H, Letzel M, Studer A. Nitroxide-mediated polymerization of N-isopropylacrylamide: Electrospray ionization mass spectrometry, matrix-assisted laser desorption ionization mass spectrometry, and multiple-angle laser light scattering studies on nitroxide-terminated poly-N-isopropylacrylamides. MACROMOLECULES. 2005; 38(16): 6833-6840. doi: 10.1021/ma050343n.

2004

• Letzel M., Decker B., Rozhenko A., Schoeller W., Mattay J. Encapsulated guest molecules in the dimer of octahydroxypyridine[4]arene. Journal of the American Chemical Society. 2004; 126(31): 9669-9674. doi: 10.1021/ja049128x.
• Mehdizadeh A., Letzel M., Klaes M., Agena C., Mattay J. Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. European Journal of Mass Spectrometry. 2004; 10(5): 649-655. doi: 10.1255/ejms.675.
• Oley M., Letzel M., Ragg H. Inhibition of furin by serpin Spn4A from Drosophila melanogaster. FEBS Letters. 2004; 577(null): 165-169. doi: 10.1016/j.febslet.2004.10.003.

2003

• Leitão E., Bittencourt V., Haido R., Valente A., Peter-Katalinic J., Letzel M., de Souza L., Barreto-Bergter E. β-Galactofuranose-containing O-linked oligosaccharides present in the cell wall peptidogalactomannan of Aspergillus fumigatus contain immunodominant epitopes. Glycobiology. 2003; 13(10): 681-692. doi: 10.1093/glycob/cwg089.

2002

• Bahrke S., Einarsson J., Gislason J., Haebel S., Letzel M., Peter-Katalinić J., Peter M. Sequence analysis of chitooligosaccharides by matrix-assisted laser desorption ionization postsource decay mass spectrometry. Biomacromolecules. 2002; 3(4): 696-704. doi: 10.1021/bm020010n.
• Letzel M., Agena C., Mattay J. Investigation of homo- and heterodimer alkali metal cation complexes of resorc[4]arenes by electrospray ionization mass spectrometry. Journal of Mass Spectrometry. 2002; 37(1): 63-68. doi: 10.1002/jms.247.
• Letzel M., Grützmacher H., Fürst T., Mayer K., Wiegrebe W. Functional group migration in benzaldoxime-O-n-propyl ether radical cation. International Journal of Mass Spectrometry. 2002; 217(null): 153-168. doi: 10.1016/S1387-3806(02)00571-7.
• Müller A., Diemann E., Shah S., Kuhlmann C., Letzel M. Soccer-playing metal oxide giant spheres: A first step towards patterning structurally well defined nano-object collectives. Chemical Communications. 2002; null(5): 440-441.

2001

• Hollah P, Hausberg M, Kosch M, Barenbrock M, Letzel M, Schlatter E, Rahn KH. A novel assay for determination of diadenosine polyphosphates in human platelets: studies in normotensive subjects and in patients with essential hypertension. J Hypertens. 2001; 19(2): 237-45. doi: 10.1097/00004872-200102000-00010.
• Letzel M., Agena C., Mattay J. Letter: Calibration of electrospray mass spectrometers with rccc-2,8,14,20-tetra-n-octyl-5,11,17,23- tetrahydroxyresorc[4]arene in the high mass range up to m/z 6000. European Journal of Mass Spectrometry. 2001; 7(1): 35-38.

2000

• Letzel Matthias C., Synstad B., Eijsink V.G. H. , Peter-Katalinić Jasna, Peter Martin G. Libraries of chito-oligosaccharides of mixed acetylation patterns and their interactions with chitinases. In: Peter G., Muzzarelli R.A.A., Domard A., editors. : Advan. Chitin Science 2000, Vol. IV. 2000 S. 545-552.

1995

• Schäfer H. J., Klotz-Berendes B., Letzel M., Zielinski C., Schoo N., Lohl T. Höweler U. Diastereoselective and Enantioselective Conversions at the Anode and the Cathode. In: Torii Sigeru, editor. : Novel Trends in Electroorganic Synthesis. 1995 S. 149-154.