PD Dr. rer. nat. Johanna Graßmann

2022

Journal Articles

• Reichel, Julia; Graßmann, Johanna; Knoop, Oliver; Letzel, Thomas; Drewes, Jörg E.: A Novel Analytical Approach to Assessing Sorption of Trace Organic Compounds into Micro- and Nanoplastic Particles. Biomolecules 12 (7), 2022, 953 more… BibTeX Full text ( DOI )
• Reichel, Julia; Graßmann, Johanna; Knoop, Oliver; Letzel, Thomas; Drewes, Jörg E.: A Novel Analytical Approach to Assessing Sorption of Trace Organic Compounds into Micro- and Nanoplastic Particles. Biomolecules 12 (7), 2022, 953 more… BibTeX Full text ( DOI )

2021

Journal Articles

• Reichel, Julia; Graßmann, Johanna; Knoop, Oliver; Drewes, Jörg E.; Letzel, Thomas: Organic Contaminants and Interactions with Micro- and Nano-Plastics in the Aqueous Environment: Review of Analytical Methods. Molecules 26 (4), 2021, 1164 more… BibTeX Full text ( DOI )

2020

Journal Articles

• Bartonitz, Astrid; Anyanwu, Ihuoma N.; Geist, Juergen; Imhof, Hannes K.; Reichel, Julia; Graßmann, Johanna; Drewes, Joerg E.; Beggel, Sebastian: Modulation of PAH toxicity on the freshwater organism G. roeseli by microparticles. Environmental Pollution 260, 2020, 113999 more… BibTeX Full text ( DOI )
• Reichel, Julia; Graßmann, Johanna; Letzel, Thomas; Drewes, Jörg E.: Systematic Development of a Simultaneous Determination of Plastic Particle Identity and Adsorbed Organic Compounds by Thermodesorption–Pyrolysis GC/MS (TD-Pyr-GC/MS). Molecules 25 (21), 2020, 4985 more… BibTeX Full text ( DOI )
• Wahman, Rofida; Graßmann, Johanna; Sauvêtre, Andrés; Schröder, Peter; Letzel, Thomas: Lemna minor studies under various storage periods using extended-polarity extraction and metabolite non-target screening analysis. Journal of Pharmaceutical and Biomedical Analysis 188, 2020, 113362 more… BibTeX Full text ( DOI )

2019

Journal Articles

• Rofida Wahman, Johanna Grassmann, Peter Schröder, and Thomas Letzel: Plant Metabolomic Workflows Using Reversed-Phase LC and HILIC with ESI-TOF-MS. LCGC North America 37 (3), 2019, 8-15 more… BibTeX

2018

Journal Articles

• Stadlmair, Lara F.; Grosse, Sylvia; Letzel, Thomas; Drewes, Jörg E.; Grassmann, Johanna: Comprehensive MS-based screening and identification of pharmaceutical transformation products formed during enzymatic conversion. Analytical and Bioanalytical Chemistry 411 (2), 2018, 339-351 more… BibTeX Full text ( DOI )
• Stadlmair, Lara F.; Grosse, Sylvia; Letzel, Thomas; Drewes, Jörg E.; Grassmann, Johanna: Comprehensive MS-based screening and identification of pharmaceutical transformation products formed during enzymatic conversion. Analytical and Bioanalytical Chemistry, 2018 more… BibTeX Full text ( DOI )
• Stadlmair, Lara F.; Letzel, Thomas; Drewes, Jörg E.; Grassmann, Johanna: Enzymes in removal of pharmaceuticals from wastewater: A critical review of challenges, applications and screening methods for their selection. Chemosphere 205, 2018, 649-661 more… BibTeX Full text ( DOI )

2017

Journal Articles

• Stadlmair, Lara F.; Letzel, Thomas; Drewes, Jörg E.; Graßmann, Johanna: Mass spectrometry based in vitro assay investigations on the transformation of pharmaceutical compounds by oxidative enzymes. Chemosphere 174, 2017, 466 - 477 more… BibTeX Full text ( DOI )
• Stadlmair, Lara F.; Letzel, Thomas; Graßmann, Johanna: Monitoring enzymatic degradation of emerging contaminants using a chip-based robotic nano-ESI-MS tool. Analytical and Bioanalytical Chemistry 410 (1), 2017, 27-32 more… BibTeX Full text ( DOI )
• Stadlmair, Lara F.; Letzel, Thomas; Graßmann, Johanna: Monitoring enzymatic degradation of emerging contaminants using a chip-based robotic nano-ESI-MS tool. Analytical and Bioanalytical Chemistry 410 (1), 2017, 27-32 more… BibTeX Full text ( DOI )

Conference Papers / Poster

• Burkhardt, T., Grassmann, J., Letzel, T, Drewes, J.E.: Investigating the enzymatic activity in managed aquifer recharge systems. An approach combining photometry and mass spectrometry. Anakon, 2017 more… BibTeX
• Kaufmann, C., Grassmann, J., Letzel, T.: The e-learning Platform “Analytics+“ for Analytical Chemistry - Learn, Practice, Apply. Anakon, 2017 more… BibTeX
• Stadlmair, L.; Grassmann, J.; Drewes, J. E.; Letzel, T.: Enzymatischer Abbau von Pharmazeutika: Untersuchungen zu Transformationspotential und Reaktionsmechanismen mittels massenspektrometrischer Technologien. Langenau Wasserforum, 2017 more… BibTeX
• Stadlmair, L.F., Grassmann, J., Drewes, J.E., Letzel, T.: Massenspektrometrische Untersuchung der enzymatischen Transformation von Spurenstoffen in Einzelansätzen und Mischungen. Anakon, 2017 more… BibTeX
• Wahmann, R.; Graßmann, J.; Schröder, P.; Letzel, T.: Novel Analytical Strategies for Anthropogenic Compounds in Plants: Vegetable Biomonitors for Water Contaminations. Langenau Wasserforum, 2017 more… BibTeX

Misc.

• Kaufmann, C.M., Letzel,T., Grassmann,J., Pfaffl, M.W.: Effect of Perilla frutescens extracts on cell physiology in porcine jejunal epithelial cells. Phytother. Res. (31), 2017, 303-311 more… BibTeX

2016

Journal Articles

• Kaufmann, Christine M.; Grassmann, Johanna; Letzel, Thomas: HPLC method development for the online-coupling of chromatographic Perilla frutescens extract separation with xanthine oxidase enzymatic assay. Journal of Pharmaceutical and Biomedical Analysis 124, 2016, 347 - 357 more… BibTeX Full text ( DOI )

Conference Papers / Poster

• Stadlmair, L., Grassmann, J., Drewes, J.E., Letzel, T: Enzymatic Transformation of Trace Organic Chemicals – Characterization of Reaction Mechanism using Mass Spectrometric Technologies. Wasser 2016, 2016 more… BibTeX
• Stadlmair, L., Grassmann, J., Drewes, J.E., Letzel, T.: Mass Spectrometry Based investigations on the transformation of trace organic chemicals. Enzymes in the environment, 2016 more… BibTeX

2015

Journal Articles

• Burkhardt, T., Kaufmann, C.M., Letzel, T., Grassmann, J.: Enzymatic Assays Coupled with Mass Spectrometry with or without Embedded Liquid Chromatography. ChemBioChem 16 (14), 2015, 1985-1992 more… BibTeX Full text ( DOI )
• Burkhardt, T., Letzel, T., Drewes, J.E., Grassmann, J.: Comprehensive assessment of Cytochrome P450 reactions: A multiplex approach using real-time ESI-MS. Biochimica et Biophysica Acta (BBA) - General Subjects 1850 (12), 2015, 2573-2581 more… BibTeX Full text ( DOI )

Conference Papers / Poster

• Burkhardt, T., Grassmann, J., Drewes, J.E., Letzel, T.: Assessment of Cytochrome P450 reactions using real-time ESI-MS: A multiplex approach. ANAKON, 201523.-26.03.2015 more… BibTeX
• Kaufmann, C., Grassmann, J., Letzel, T.: Die asiatische ‚Wunderpflanze‘ Perilla frutescens — Inhaltsstoffe und deren regulative Funktion. 6. Lebensmittelseminar, 201519.11.2015 more… BibTeX
• Stadlmair, L., Grassmann, J., Drewes, J.E., Letzel, T.: Enzymatic Transformation of Trace Organic Chemicals – Characterization of Reaction Mechanisms using Mass Spectrometric Technologies. ANAKON, 201523.-26.03.2015 more… BibTeX

2014

Journal Articles

• Kaufmann, C.M., Graßmann, J., Treutter, D., Letzel, T.: Utilization of real-time ESI-MS to gain further insight into the course of nucleotide degradation by intestinal alkaline phosphatase. Rapid Communications in Mass Spectrometry 28 (8), 2014, 869-878 more… BibTeX Full text ( DOI )
• Krappmann, M., Kaufmann, C.M., Scheerle, R.K., Grassmann, J., Letzel, T.: Achroma Software-High-Quality Policy in (a-)Typical Mass Spectrometric Data Handling and Applied Functional Proteomics. Journal of Proteomics & Bioinformatics 9 (7), 2014, 264-271 more… BibTeX Full text ( DOI )

Conference Papers / Poster

• Burkhardt, T., Graßmann, J., Kaufmann, C., Letzel, T.: Hyphenation of effect-directed enzymatic reactions to mass spectrometry. ICMS 2014, 201424.-29.08.2014 more… BibTeX

2013

Books / Contributions to Collections

• Shinya, S., Ohnuma, T., Brzezinski, R., Scheerle, R.K., Grassmann, J., Letzel, T., Fukamizo, T.: Lysozyme Superfamily: Progress in Functional Analysis using ESI-MS and NMR Spectroscopy. In: Maang, X.G., Cheung, W.F. (Ed.): Lysozymes: Sources, Functions and Role in Disease. Nova Science Publishers, 2013, 127-154 more… BibTeX

Journal Articles

• Teutenberg, T., Zeiner, T., Portner, C., Klaßen, M., Scheerle, R., Grassmann, J., Letzel, T., Belder, D.: Entwicklung von Analysestrategien zur direkten Kopplung enzymatischer Systeme mit massenspektrometrischer Detektion. G.I.T. Laborfachzeitschrift (7), 2013, 2-3 more… BibTeX

Conference Papers / Poster

• Kaufmann, C.M., Grassmann, J., Letzel, T.: Establishment of control measurements for a multi-component enzymatic assay investigated with an online coupled continuous flow system. Proteomics Forum, 20132013 more… BibTeX
• Scheerle, R.K., Grassmann, J., Letzel, T.: Investigation of enzymatic reactions using a miniaturised and automated nanoESI-MS system. ANAKON, 201304.-07.03.2013 more… BibTeX

2012

Journal Articles

• Grassmann, J., Scheerle, R.K., Letzel, T.: Functional proteomics: application of mass spectrometry to the study of enzymology in complex mixtures. Analytical and Bioanalytical Chemistry 402 (2), 2012, 625-645 more… BibTeX Full text ( DOI )
• Scheerle, R.K., Graßmann, J., Letzel, T.: Real-time ESI-MS of Enzymatic Conversion: Impact of Organic Solvents and Multiplexing. Analytical Sciences 28 (6), 2012, 607-612 more… BibTeX Full text ( DOI )

Conference Papers / Poster

• Scheerle, R.K., Kaufmann, C., Krappmann, M., Graßmann, J., Letzel, T.: How to handle huge amount of mass spectrometric data? A new strategy with the Achroma software. Joint Conference of the Polish Mass Spectrometry Society and the German Mass Spectrometry Society (DGMS), 201204.-07.03.2012 more… BibTeX