Peer-reviewed Paper

2024

[128] E. Sekera, A. Somogyi, Z. Takats, F. Stappert, C. Thom, O. J. Schmitz, C. Moeckel, B. Paizs, J. Sommertune, Utilization of bis-MPA Dendrimers for the Calibration of Ion Mobility Collision Cross Section Calculations, Journal of the American Society for Mass Spectrometry (2024) doi.org/10.1021/jasms.3c00428

[127]   Z. Yao, K. Zhu, T. Gu, O. J. Schmitz, D. Li, An active derivatization detection method for inline monitoring the isolation of carbohydrates by preparative liquid chromatography, Journal of Chromatography A (2024) doi.org/10.1016/j.chroma.2024.464730

[126]   A. K. Mallik, L. Montero, S. W. Meckelmann O. J. Schmitz, Facile preparation of embedded polar group-containing pentafluorophenyl stationary phases for highly selective separations of diverse analytes, Journal of Chromatography A (2024) 1717:464688

[125]   M. Rogava, T. J. Aprati, W.-Y. Chi, J. C. Melms, C. Hug, S.H. Davis, E.M. Earlie, C. Chung, S. K. Deshmukh, S. Wu, G. Sledge, S. Tang, P. Ho, A. D. Amin, L. Caprio, C. Gurjao, S. Tagore, B. Ngo, M. J. Lee, G. Zanetti, Y. Wang, S. Chen, W. Ge, L. Martins Nascentes Melo, G. Akkies, J. Rösler, G. T. Gibney, O. J. Schmitz, M. Sykes, R. J. Creusot, T. Tüting, D. Schadendorf, M. Röcken, T. K. Eigentler, A. Molotkov, A. Mintz, S. F. Bakhoum, S. Beyaz, L. C. Cantley, P. K. Sorger, S. W. Meckelmann, A. Tasdogan, D. Liu, A. M. Laughney, B. Izar, Loss of Pip4k2c confers liver-metastatic organotropism, Nature Cancer (2024) doi.org/10.1038/s43018-023-00704-x 

[124]   A. Pape, O. J. Schmitz, Dielectric barrier discharge in mass spectrometry - an overview over plasma investigations and ion sources applications, Trends in Analytical Chemistry (2024) 170:117420

2023

[123]   S. Imada, H. Shin, S. Khawaled, S. W. Meckelmann, C. A Whittaker, R. Oliveira Corrêa, D. Pradhan, G. Calibasi-Kocal, L. Martins Nascentes Melo, G. Allies, P. Wittenhofer, O. J. Schmitz, J. Roper, M. Aurelio Ramirez Vinolo, C.-W. Cheng, A. Tasdogan, Ö. H Yilmaz, Post-fast refeeding enhances intestinal stem cell-mediated regeneration and tumourigenesis through mTORC1-dependent polyamine synthesisRes Sq [Preprint]. 2023 Jan 10:rs.3.rs-2320717. doi: 10.21203/rs.3.rs-2320717/v1. PMID: 36711807; PMCID: PMC9882602.

[122]   M. M. A. Omar, A. A. Elbashir, O. J. Schmitz, A. K. Ziyada, A. Osman, Validation of high-performance liquid chromatography coupled with LTQ orbitrap mass spectrometry for analysis of acrylamide, Journal of Food Measurement and Characterization, doi.org/10.1007/s11694-023-02223-w

[121]   A. Mallik, L. Montero, J. Roesler, S. Meckelmann, O. J. Schmitz, Surface-modification of silica with beta-alanine derivative for unique applications in liquid chromatography, ACS Applied Materials & Interfaces (2023) 15(46):54176-54184, doi.org/10.1021/acsami.3c11932

[120]   L. Mondello, P. Dugo, P. Donato, M. Herrero, L. Montero, Oliver J. Schmitz, Comprehensive two-dimensional liquid chromatography, Nature Reviews Methods Primers (2023) 3:86, doi.org/10.1038/s43586-023-00269-0

[119]   J. F. Ayala-Cabrera, L. Montero, T. Sahlabji, O. J. Schmitz, Comprehensive two-dimensional gas chromatography with flow modulator coupled via tube plasma ionization to an atmospheric pressure high-resolution mass spectrometer for the analysis of vermouth volatile profile, Analytical and Bioanalytical Chemistry (2023) 415(13):2561-2573, doi.org/10.1007/s00216-023-04688-6

[118]   A. K. Mallik, L. Montero, S. W. Meckelmann, O. J. Schmitz, Design of -Alanine-Derived Novel C18 Stationary Phase Containing Embedded Urea and Amide Groups for the Separation of Versatile Analytes, Analytical Chemistry (2023) 95:6172–6181

[117]   J. Lu, X. Hiong, M. Ma, B. Chen, Y. Chen, O. J. Schmitz, Enhancing the compatibility of normal-phase chromatography x reversed−phase chromatography by combination of low−temperature sensitive aqueous-phase compatible normal- phase chromatography and at−column dilution modulation, Journal of Chromatography A (2023) 1691:463821

[116]   L. Montero, J. F. Ayala-Cabrera, F. F. Bristy, O. J. Schmitz, Multi-2D LC × LC as a Novel and Powerful Implement for the Maximum Separation of Complex Samples, Analytical Chemistry (2023) 95:3398-3405

[115]   J. F. Ayala-Cabrera, L. Montero, S. W. Meckelmann, F. Uteschil, O. J. Schmitz, Review on atmospheric pressure ionization sources for gas chromatography-mass spectrometry. Part I: Current ion source developments and improvements in ionization strategies, Analytica Chimica Acta (2023) 1238:340353

[114]    J. F. Ayala-Cabrera, L. Montero, S. W. Meckelmann, F. Uteschil, O. J. Schmitz, Review on atmospheric pressure ionization sources for gas chromatography-mass spectrometry. Part II: Current applications, Analytica Chimica Acta (2023) 1238:340379 

2022

[113]   D. Maehler, S. Hoefgen, U. Münchberg, O. J. Schmitz, J. Rautschek, Y. Huang, E. Freier, V. Valiante, Time-resolved multiparameter analytics on a cell-free production platform for acyl-CoA precursors, Analytical Science Advances (2022) 3:289-296

[112]   L. Kuschmierz, M. Meyer, C. Bräsen, J. Wingender, O. J. Schmitz, B. Siebers, Exopolysaccharide composition and size in Sulfolobus acidocaldarius biofilms, Frontiers Microbiology (2022) 13:982745

[111]   V. Dosedělová, M. Laštovičková, J. F. Ayala-Cabrera, J. Dolina, Š. Konečný , O. J. Schmitz, P. Kubáň, Quantification and identification of bile acids in saliva by liquid chromatography-mass spectrometry: Possible non-invasive diagnostics of Barret´s esophagus?  Journal of Chromatography A (2022) 1676:463287

[110]   S. K. Heuser, A. LoBue, J. Li, Z. Zhuge, F. Leo, T. Suvorava, A. Olson, R. Schneckmann, D. D. Guimaraes Braga, T. Srivrastava, L. Montero, O. J. Schmitz, J. P. Schmitt, M. Grandoch, E. Weitzberg, J. O. Lundberg, J. Pernow, M. Kelm, M. Carlström, M. M. Cortese-Krott, Downregulation of eNOS and preserved endothelial function in endothelial-specific arginase 1-deficient mice, Nitric Oxide (2022), doi.org/10.1016/j.niox.2022.06.004

[109]   Y. Großmann, U. Schreiber, C. Mayer, O. J. Schmitz, Aliphatic aldehydes in the Earth’s crust – remains of prebiotic chemistry? Life (2022) 12: 925; https://doi.org/10.3390/life12070925

[108]   J. F. Ayala-Cabrera, J. Turkowski, F. Uteschil, O. J. Schmitz, Development of a tube plasma ion source for gas chromatography-mass spectrometry analysis and comparison with other atmospheric pressure ionization techniques, Analytical Chemistry (2022) 94:9595-9602

[107]   T. Koehler, J. Wingender, M. Lueling, S. W. Meckelmann, U. Telgheder, O. J. Schmitz, Characterization of the extracellular volatile metabolome of Pseudomonas aeruginosa applying an in vitro biofilm model under cystic fibrosis-like conditions, Frontiers in Bioscience – Landmark (2022), 27:156

[106]   A. R. Ziefuß, T. Hupfeld, S. W. Meckelmann, M. Meyer, O. J. Schmitz, W. Kaziur-Cegla, L. K. Tintrop, T. Schmidt, B. Gökce, S. Barcikowski, Ultrafast cold-brewing of coffee by picosecond-pulsed laser extraction, npj Science of Food (2022) 16:19; 10.1038/s41538-022-00134-6 

[105]   L. Montero, S. Meckelmann, H. Kim, J. F. Ayala-Cabrera, O. J. Schmitz, Differentiation of the cannabinoid and phenolic compounds of industrial hemp varieties by LC×LC-HRMS, Analytical and Bioanalytical Chemistry (2022); https://doi.org/10.1007/s00216-022-03925-8

2021

[104]   M. Meyer, L. Montero, S. W. Meckelmann, O. J. Schmitz, Comparative study for analysis of carbohydrates in biological samples, Analytical and Bioanalytical Chemistry (2021) doi.org/10.1007/s00216-021-03845-z

[103]   K. Tötsch, J. Fjeldsted, S. Stow, O. J. Schmitz, S. W. Meckelmann, Effect of Sampling Rate and Data Pretreatment for targeted and non-targeted Analysis by means of Liquid Chromatography coupled to Drift Time Ion Mobility Quadruple Time-Of-Flight Mass Spectrometry, Journal of the American Society for Mass Spectrometry (2021) 32(10):2592-2603 

[102]   T. T. Bui, T. H. Nguyen, H. A. Duong, H. V. Pham, O. J. Schmitz, V. T. Nguyen, Q. A. Ngo, Hepatoprotective effect of water extract formulation from Stixis suaveolens and Pandanus tonkinensis against liver injury induced by acetaminophen and in vitro CCl4-induced toxicity, Vietnam Journal of Chemistry (2021) 59(6):836-845, doi: 10/1002/vjch.202100054

[101]   D. Brecht, F. Uteschil, O. J. Schmitz, Development of an inverse-low-temperature plasma ionization source for LC-MS, Rapid Communication in Mass Spectrometry (2021) 34:e8845

[100]   F. E. O. Suliman, S. K. Al Burtomani, A. A. Elbashir, O. J. Schmitz, Capillary electrophoresis and molecular modeling of the chiral separation of aromatic amino acids using α/β‐cyclodextrin and 18‐crown‐6, Electrophoresis (2021) 42(17):1800-1809

[99]    J. F. Ayala-Cabrera, C. Lipok, J. Li, E. Moyano,  O. J. Schmitz, F. J. Santos, Ionic Liquid Stationary Phase for Improving Comprehensive Two-dimensional Gas Chromatographic Separation of Polychlorinated Naphthalenes, Journal of Chromatography A (2021) 1635: 461732-461737

[98]   J. F. Ayala-Cabrera, C. Lipok, E. Moyano, O. J. Schmitz, F. J. Santos, Atmospheric Pressure Ionization for Gas Chromatography-High Resolution Mass Spectrometry Determination of Polychlorinated Naphthalenes,
Chemosphere (2021) 263:127963-127973

[97]   P. Rusch, A. V. Hirner, O. Schmitz, R. Kimmig, O. Hoffmann, M. Diel, Zinc distribution within breast cancer tissue of different intrinsic subtypes, Archives of Gynecology and Obstetrics (2021) 303:195–205(2021)

2020

[96]   L. Montero, O. J. Schmitz, S. W. Meckelmann, Chemical Characterization of eight Herbal Liqueurs by means of Liquid Chromatography Coupled with Ion Mobility Quadrupole Time-of-Flight Mass Spectrometry, Journal of Chromatography A (2020) 1631:461560-461571

[95]   C. Lipok, F. Uteschil, O. J. Schmitz*, Development of an atmospheric pressure chemical ionization interface for GC-MS, Molecules (2020) 25:3253-3265

[94]    J. Li, C. Rumancev, H. V. Lutze, T. C. Schmidt, A. Rosenhahn, O. J. Schmitz*, Effect of ozone stress on the intracellular metabolites from Cobetia marina, Analytical and Bioanalytical Chemistry (2020) 412:5853-5861

[93]   S. Hellhake, S. W. Meckelmann, M. T. Empl, K. Rentmeister, W. Wißdorf, P. Steinberg, O. J. Schmitz, T. Benter, N. H. Schebb, Non-targeted and targeted analysis of oxylipins in combination with charge switch derivatization by ion mobility high resolution mass spectrometry, Analytical and Bioanalytical Chemistry (2020) 412:5743-5757

[92]   D. Brecht, F. Uteschil, O. J. Schmitz* Development of a fast-switching dual (ESI/APCI) ionization source for liquid chromatography mass spectrometry, Rapid Communication in Mass Spectrometry (2020) 34 (17):e8845

[91]   B. Peng, D. Kopczynski, B. Pratt, C. Ejsing, B. Burla, M. Hermansson, P. Benke, S. Tan, M. Chan, F. Torta, D. Schwudke, S. Meckelmann, C. Coman, O. J. Schmitz, B. MacLean, M.-C. Manke, O. Borst, M. Wenk, N. Hoffmann R. Ahrends LipidCreator workbench to probe the lipidomic landscape, Nature Communications (2020) 11:2057-2070

[90]   T. Koehler, I. Ackermann, D. Brecht, F. Uteschil, J. Wingender, U. Telgheder, O. J. Schmitz* Analysis of volatile metabolites from in vitro biofilms of Pseudomonas aeruginosa with thin-film microextraction by thermal desorption gas chromatography-mass spectrometry, Analytical and Bioanalytical Chemistry (2020) 412:2881–2892

[89]   Y. Chen, L. Montero, J. Luo, J. Li, O. J. Schmitz* Application of the new at-column dilution (ACD) modulator for the two-dimensional RPxHILIC analysis of Buddleja davidii, Analytical and Bioanalytical Chemistry (2020) 412:1483–1495 (open access)

[88]   Q. A. Ngo, D. T. Hoang, T. Duc, H. A. Duong, O. J. Schmitz, H. V. Pham Characterization of volatile components from Ethyl acetate extract of Stixis suaveolens (Roxb.) by comprehensive two-dimensional gas chromatography hyphenated with a time-of-flight mass spectrometer, Vietnam Journal of Chemistry (2020) 58:261-266

2019

[87]   Y. Chen, L. Montero, O. J. Schmitz* Advance in on-line two-dimensional liquid chromatography modulation technology, Trends in Analytical Chemistry (2019) 120:115647

[86]   Y. Chen, J. Li, O. J. Schmitz* Development of an at-column dilution modulator for flexible and precise control of dilution factors to overcome mobile phase incompatibility in comprehensive two-dimensional liquid chromatography, Analytical Chemistry (2019) 91:10251-10257

[85]   A. Doell, O. J. Schmitz, M. Hollmann Shedding light into the subcutis – A mass spec based immuno-capture assay enables full characterization of therapeutic antibodies after injection in-vivo, Analytical Chemistry (2019) 91: 9490-9499

[84]   C. Hellmann, O. J. Schmitz* How to deal with mercury in sediments? A critical review about used methods for the speciation of mercury in sediments, Chromatographia (2019) 82: 125-141

[83]   D. Brecht, F. Uteschil, O. J. Schmitz* Thermogravimetry coupled to an atmospheric pressure photo ionization quadrupole mass spectrometry for the product control of pharmaceutical formulations and the analysis of plasticizers in polymers, Talanta (2019) 198:440-446

[82]   C. Koch, M. Nachev, J. Klein, D. Koester, O. J. Schmitz, T. Schmidt, B. Sures Degradation of the polymeric brominated flame retardant "Polymeric FR" by heat and UV, Environmental Science & Technology (2019) 53:1453-1462

2018

[81]   S. Brüggen, O. J. Schmitz* A new concept for regulatory water monitoring via high-performance liquid chromatography coupled to high-resolution mass spectrometry, Journal of Analysis and Testing (2018) 2:342-351

[80]   K. Jooß, S. W. Meckelmann, J. Klein, O. J. Schmitz, C. Neusüß Capillary zone electrophoresis coupled to drift tube ion mobility-mass spectrometry for the analysis of native and APTS-labeled N-glycans, Analytical and Bioanalytical Chemistry (Paper in Forefront, org/10.1007/s00216-018-1515-7)

[79]   L. C. Weiss, B. Albada, S. M. Becker, S. W. Meckelmann, J. Klein, M. Meyer, O. J. Schmitz, U. Sommer, M. Leo, J.  Zagermann, N. Metzler-Nolte, R. Tollrian The scent of predation: Identification of an aquatic infochemical – the Chaoborus kairomone, Nature Chemical Biology (2018) 14:1133-1139

[78]   V. Hinnekamp, J. Klein, S. Meckelmann, P. Balsaa, T. Schmidt, O. J. Schmitz* Comparison of CCS Values Determined by Traveling Wave Ion Mobility Mass Spectrometry and Drift Tube Ion Mobility Mass Spectrometry, Analytical Chemistry (2018) 90:12042-12050

[77]   C. Mayer, U. Schreiber, M. J. Dávila, O. J. Schmitz, A. Bronja, M. Meyer, J. Klein, S. W. Meckelmann Molecular Evolution in a Peptide-Vesicle System, Life (2018) 8: 16 (open access)

[76]   C. Lipok, J. Hippler, O. J. Schmitz* A four dimensional separation method based on continuous heart-cutting gas chromatography with ion mobility and high resolution mass spectrometry, Journal of Chromatography A (2018) 1536:50-57

2017

[75]   S. Horst, O. J. Schmitz* Quantitative analysis of bisphenol A in recycled paper with a novel Direct Inlet Probe – Atmospheric Pressure Photoionization-IonTrap-MS, Journal of Analysis and Testing (2017) 1:255-263 (open access)

[74]   A. A. Deeb, S. Stephan, O. J. Schmitz, T. C. Schmidt Suspect screening of micropollutants and their transformation products in advanced wastewater treatment, Science of the Total Environment (2017) 601-602:1247-1253

[73]   P. Weyrauch, A. V. Zaytsev, S. Stephan, L. Kocks, O. J. Schmitz, B. T. Golding, R. U. Meckenstock Conversion of cis-2-carboxycyclohexylacetyl-CoA in the downstream pathway of anaerobic naphthalene degradation, Environmental Microbiology (2017) 19:2819-2830

[72]   U. Schreiber, C. Mayer, O. J. Schmitz, P. Rosendahl, A. Bronja, M. Greule, F. Keppler, I. Mulder, T. Sattler, H. F. Schöler Organic compounds in fluid inclusions of Archean quartz – archives of prebiotic chemistry on early Earth, PLoS ONE 12(6): e0177570

[71]   H. Y. Aboul-Enein, A. A. Elbashir, O. J. Schmitz Application of capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D): an update, Biomedical Chromatography (2017) e3945 (DOI 10.1002/bmc.3945)

[70]   S. Stephan, J. Hippler, T. Köhler, D. Brecht, O. J. Schmitz* A powerful four-dimensional separation method for complex samples, Journal of Analysis and Testing (2017) 1:1-9 (open access)

[69]   A. Abu awwad, T. Arafat, O. J. Schmitz* Study the Influence of Licorice and Pomegranate Drinks on Nicotine Metabolism in Human Urine, Journal of Pharmaceutical and Biomedical Analysis 132 (2017) 60-65

[68]   M. M. A. Omar, A. A. Elbashir , O. J. Schmitz* Capillary Electrophoresis Method with UV-detection for Analysis of Free Amino Acids concentrations in Food, Food Chemistry (2017) 214:300-307

2016

[67]   A. Abu awwad, T. Arafat, O. J. Schmitz* Determination of Nicotine and Cotinine in Human Blood by Dried Blood Spot-LC-Orbitrap MS Technique, Journal of Analytical & Pharmaceutical Research (2016) 3:1-7

[66]   C. Koch, A. Dundua, J. Aragon-Gomez, M. Nachev, S. Stephan, S. Willach, M. Ulbricht, O.J. Schmitz, T. Schmidt, B. Sures Degradation of polymeric brominated flame retardants: Development of an analytical approach using PolyFR and UV irradiation, Environmental Science & Technology (2016) 50:12912–12920

[65]   S. Scherer, E. Wollrab, L. Codutti, T. Carlomagno, S. Gomes da Costa, A. Volkmer, A. Bronja, O. J. Schmitz, A. Ott Chemical analysis of a "Miller-type" complex prebiotic broth Part II: gas, oil, water and the oil/water-interface, Origins of Life and Evolution of Biospheres, DOI 10.1007/s11084-016-9528-8

[64]   S. Stephan, J. Hippler, T. Köhler, A. Deep, T. Schmidt, O. J. Schmitz* Contaminant screening of wastewater with HPLC-IM-qTOF-MS and LC+LCIM-qTOF-MS using a CCS database, Analytical and Bioanalytical Chemistry (2016) 408:6545-6555

[63]   A. Abu awwad, T. Arafat, O. J. Schmitz* Simultaneous determination of nicotine, cotinine and nicotine N-oxide in human plasma, semen and sperm by LC-Orbitrap MS, Analytical and Bioanalytical Chemistry (2016) 408:6473-6481

[62]   T. Arafat, B. Arafat, A. Abu awwad, O. J. Schmitz Determination of Fenofibric Acid in Human Plasma by LC-MS/MS and LC-UV, Chromatography (2016) 79:685-692

[61]   C. Lenzen, G. A. Winterfeld, O. J. Schmitz* Comparison of Piracetam measured with HPLC-DAD, HPLC-ESI-MS, DIP-APCI-MS and a newly developed and optimized DIP-ESI-MS, Analytical and Bioanalytical Chemistry (2016) 408:4103-4110

[60]   S. Stephan, C. Jakob, J. Hippler, O. J. Schmitz* A novel four-dimensional analytical approach for complex samples, Analytical and Bioanalytical Chemistry (2016) 408:3751-3759

[59]   P. Rosendahl, J. Hippler, O. J. Schmitz*, O. Hoffmann, P. Rusch Cyclic volatile methylsiloxanes in human blood as markers for ruptured silicone gel-filled breast implants, Analytical and Bioanalytical Chemistry (2016) 408:3309-3317

[58]   A. Li, O. J. Schmitz, S. Stephan, C. Lenzen, P. Y.-K. Yue, K. Li, H. Li, K. S.-Y. Leung Photocatalytic transformation of acesulfame: transformation products identification and embryotoxicity study, Water Research (2016) 89:68-75

[57]   D. Klink, O. J. Schmitz* SFC-APLI-(TOF)MS – a novel hyphenation of Supercritical Fluid Chromatography to Atmospheric Pressure Laser Ionization Mass Spectrometry, Analytical Chemistry (2016) 88:1058-1064

 

2015

[56]   D. Li, L. Gan, A. Bronja; O. J. Schmitz* Gas chromatography coupled to atmospheric pressure ionization mass spectrometer (GC-API-MS): Review, Analytica Chimica Acta (2015) 891:43-61

[55]   F. O. Suliman, A. A. Elbashir, O. J. Schmitz Study on the separation of ofloxacin enantiomers by hydroxyl-propyl-ß-cyclodextrin as a chiral selector in capillary electrophoresis: a computational approach, Journal of Inclusion Phenomena and Macrocyclic Chemistry (2015) DOI 10.1007/s10847-015-0547-2

[54]   E. Deibel, D. Klink, O. J. Schmitz* New derivatization strategies for the ultrasensitive analysis of non-aromatic analytes with APLI-TOF-MS, Analytical and Bioanalytical Chemistry (2015) 407:7425-7434

[53]   M. M. A. Omar, A. A. Elbashir, O. J. Schmitz* Determination of acrylamide in Sudanese food by high performance liquid chromatography coupled with LTQ Orbitrap mass spectrometry, Food Chemistry (2015) 176:342-349

[52]   D. Li, C. Jakob, O. J. Schmitz* Review: Practical considerations in comprehensive two-dimensional liquid chromatography systems (LCxLC) with Reversed-phases in both dimensions, Analytical and Bioanalytical Chemistry (2015) 407:153-167

[51]   V. Elsner, V. Wulf, M. Wirtz, O. J. Schmitz* Reproducibility of retention time and peak area in comprehensive two-dimensional liquid chromatography, Analytical and Bioanalytical Chemistry (2015) 407:279-284

[50]   D. Li, O. J. Schmitz* Comprehensive two-dimensional liquid cromatography tandem DAD and accurate mass QTOF-MS for the analysis of flavinoids and iridoid glycosides in Heditys diffusa, Analytical and Bioanalytical Chemistry (2015) 407:231-240

2014

[49]   A. A. Elbashir, S. Krieger, O. J. Schmitz* Simultaneous Determination of Polyamines and Acetylpolyamines in human urine by Capillary Electrophoresis with Fluorescence Detection, Electrophoresis 35 (2014) 570-576

[48]   D. Li, R. Dück, O. J. Schmitz* The Advantage of Mixed-Mode Separation in the First Dimension of Comprehensive Two-Dimensional Liquid-Chromatography, J. Chromatogr. A (2014) 1358:128-135

[47]   S. Krieger, O. J. Schmitz* Non-destructive mass spectrometric plasticiser screening using a direct inlet probe-atmospheric pressure chemical ionization source and ion trap MS, Rapid Commun. Mass Spectrom. 28 (2014) 1862-1870

[46]   A. A. Elbashir, M. M. A. Omar, W. A. W. Ibrahim, O. J. Schmitz, H. Y. Aboul-Enein Acrylamide Analysis in Food by Liquid Chromatographic and Gas Chromatographic Methods, Critical Reviews in Analytical Chemistry, 44 (2014) 107-141

2013

[45]   S. Krieger, H. Hayen, O. J. Schmitz* Quantification of coumarin in cinnamon and woodruff-beverages using DIP-APCI-MS and LC-MS, Analytical and Bioanalytical Chemistry DOI: 10.1007/s00216-013-7238-x

[44]   S. Pelz, J.-M. Zhang, I. Kanelidis, D. Klink, L. Hyzak, V. Wulf, O. J. Schmitz, J.-C. Gasse, R. Frahm, A. Pütz, A. Colsmann, U. Lemmer, E. Holder Synthesis and Characterization of Star-Shaped Donor–Acceptor–Donor Structures, Eur. J. Org. Chem. 2013, 4761-4769

[43]   D. Li, O. J. Schmitz* Using of shift gradient in second dimension to improve the separation space in comprehensive two-dimensional liquid chromatography, Analytical and Bioanalytical Chemistry 405 (2013) 6511-6517

[42]   N. Wienand, M. Constapel, K. Budde, J. Marzinkowski, S. Gäb, O. J. Schmitz* Degradation of a Fluorine-Free Perfluorooctane Sulfonate Substitute in Chromium Plating Solutions, Chem. Eng. Technol. 36 (2013) 390-397

[41]   L. Hyzak, S. Giese, H.-W. Kling, V. Wulf, D. Melchior, M. Köhler, O. J. Schmitz* Improvements to the compressed-sample (CS) technique for MALDI-TOF mass spectrometry, Analytical and Bioanalytical Chemistry 405 (2013) 1417-1424

[40]   S. Krieger, A. von Trotha, K. S.-Y. Leung, O. J. Schmitz* Development, optimization and use of an APCI source with temperature-controlled vaporization of solid and liquid samples, Analytical and Bioanalytical Chemistry 405 (2013) 1373-1381

2012

[39]   V. Elsner, S. Laun, D. Melchior, M. Köhler, O. J. Schmitz* Analysis of fatty alcohol derivatives with comprehensive two-dimensional liquid chromatography coupled with mass spectrometry, Journal of Chromatography A 1268 (2012) 22-28

[38]   G. Dierkes, S. Krieger, R. Dück, A. Bongartz, O. J. Schmitz, H. Hayen HPLC-MS Profiling of Phenolic Compounds for Evaluation of Olive Oil Bitterness and Pungency, J. Agric. Food Chem. 60 (2012) 7597-7606

[37]   R. Dück, H. Sonderfeld, O. J. Schmitz* A simple method for the determination of peak distribution in comprehensive two-dimensional liquid chromatography, J. Chromatogr. A 1246 (2012) 69-75

2011

[36]   L. Hyzak, R. Moos, F. von Rath, V. Wulf, M. Wirtz, D. Melchior, H.-W. Kling, M. Köhler, S. Gäb, O. J. Schmitz* Quantitative MALDI-(TOF)MS analysis of synthetic polymers and peptides, Analytical Chemistry 83 (2011) 9467-9471

2010

[35]   N. Tian, D. Lenkeit, S. Pelz, L. H. Fischer, D. Escudero, R. Schiewek, D. Klink, O. J. Schmitz, L. González, M. Schäferling, E. Holder Structure-property relationship of red and green emitting iridium(III) complexes with respect to their temperature and oxygen sensitivity, European Journal of Inorganic Chemistry (2010), 4875-4885

[34]   V. Wulf, N. Wienand, M. Wirtz, H.-W. Kling, S. Gäb, O. J. Schmitz* Analysis of special surfactants by comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry, Journal of Chromatography A 1217 (2010) 749-754

[33]   R. Dück, V. Wulf, M. Geißler, H.-U. Baier, M. Wirtz, H.-W. Kling, S. Gäb, O. J. Schmitz* Combination of chemical and electron-impact ionisation with GCxGC-qMS for the characterization of fatty alcohol alkoxylate polymers in the low molecular range up to 700 Da, Analytical and Bioanalytical Chemistry 396 (2010) 2273-2283

[32]   B. de Montera, D. El-Zeihery, S. Müller, H. Jammes, G. Brem, H.-D. Reichenbach, F. Scheipl, P. Chavatte-Palmer, V. Zakhartchenko, O. J. Schmitz, E. Wolf, J.-P. Renard, S. Hiendleder Quantification of leukocyte genomic 5-methylcytosine levels reveals epigentic plasticity of healthy adult cloned cattle, Cellular Reprogramming 12 (2010) 175-181

2009

[31]   N. Tian, A. Thiessen, R. Schiewek, O. J. Schmitz, D. Hertel, K. Meerholz, E. Holder Efficient Synthesis of Carbazolyl- and Thienyl-Substituted β-Diketonates and Properties of Their Red and Green Light-Emitting Ir(III) Complexes, Journal of Organic Chemistry 74 (2009) 2718-2725

[30]   C. Fu, G. Lu, O. J. Schmitz, Z. Li, K. S.-Y. Leung Improved Chromatographic Fingerprints for Facile Differentiation of Two Ganoderma Spp., Biomedical Chromatography 23 (2009) 280-288

2008

[29]   R. Schiewek, R. Mönnikes, V. Wulf, S. Gäb, K. J. Brockmann, T. Benter, O. J. Schmitz* A universal ionization label for the APLI-(TOF)MS analysis of small molecules and polymers, Angewandte Chemie Int. Ed. 47 (2008) 9989-9992 und Angewandte Chemie 120 (2008) 10138-10142

[28]   W. Chan, H. Yue, W. T. Poon, Y.-W. Chan, O. J. Schmitz, D. W. J. Kwong, R. N. S. Wong, Z. Cai Quantification of aristolochic acid-derived DNA adducts in rat kidney, liver by using liquid chromatography-electrospray ionization mass spectrometry, Mutation Research 646 (2008) 17-24

[27]   R. Schiewek, M. Lorenz, K. J. Brockmann, T. Benter, S. Gäb, O. J. Schmitz* Development of a multimode ion-source for LC- and GC-MS, Analytical and Bioanalytical Chemistry 392 (2008) 87-96

[26]   P. Schmitt-Kopplin, M. Englmann, R. Rossello-Mora, R. Schiewek, K. J. Brockmann, T. Benter, O. J. Schmitz* Combining Chip-ESI with APLI (cESILI) as a multimode source for the analysis of complex mixtures with ultrahigh resolution mass spectrometry, Analytical and Bioanalytical Chemistry 391 (2008) 2803-280

[25]   V. M. Arlt, M. Stiborová, C. J. Henderson, M. Thiemann, E. Frei, D. Aimová, R. Singh, G. Gamboa da Costa, O. J. Schmitz, P. B. Farmer, C. R. Wolf, D. H. Phillips Metabolic activation of benzo[a]pyrene in vitro by hepatic cytochrome P450 contrasts with detoxification in vivo: experiments with Hepatic Cytochrome P450 Reductase Null mice, Carcinogenesis 29 (2008) 656-665

[24]   M. Lorenz, R. Schiewek, K. J. Brockmann, O. J. Schmitz, S. Gäb, T. Benter The destribution of ion acceptance in atmospheric pressure ion sources: Spatially resolvedAPLI measurements, Journal of the American Society for Mass Spectrometry 19 (2008) 400-410

[23]   G. Vogt, M. Huber, M. Thiemann, G. van den Boogaart, O. J. Schmitz, C. D. Schubart Production of different phenotypes from the same genotype in the same environment by developmental variation, Journal of Experimental Biology 211 (2008) 510-523

2007

[22]   R. Schiewek, M. Schellenträger, R. Mönnikes, M. Lorenz, R. Giese, K. J. Brockmann, S. Gäb, T. Benter, O. J. Schmitz* Ultra-sensitive determination of polycyclic aromatic compounds with atmospheric-pressure laser ionization as an interface for GC-MS, Analytical Chemistry 79 (2007) 4135-4140

[21]   J. Hübner, R. Taheri, D. Melchior, H.-W. Kling, S. Gäb, O. J. Schmitz* Analysis of tensides in complex samples with comprehensive two-dimensional gas chromatography coupled with a time-of-flight mass spectrometer, Analytical and Bioanalytical Chemistry 388 (2007) 1755-1762

[20]   R. Schiewek, M. Wirtz, M. Thiemann, K. Plitt, G. Vogt, O. J. Schmitz* Determination of the DNA methylation level of the marbled crayfish: An increase in sample throughput by an optimised sample preparation, Journal of Chromatography B 850 (2007) 548-552

2006

[19]   S. Hiendleder, M. Wirtz, C. Mund, M. Klempt, H.-D. Reichenbach, M. Stojkovic, M. Weppert, H. Wenigerkind, M. Elmlinger, F. Lyko, O. J. Schmitz, E. Wolf Tissue-specific effects of in vitro fertilization procedures on genomic cytosine methylation levels in overgrown and normal sized bovine fetuses, Biology of Reproduction 75 (2006) 17-23

[18]   J. Hübner, A. Nguyen, F. Turcu, D. Melchior, H.-W. Kling, S. Gäb, O. J. Schmitz* Analysis of alkyl polyglucosides in industrial products by capillary electrophoresis with pulsed-amperometric detection, Analytical and Bioanalytical Chemistry 384 (2006) 259-264

[17]   O. J. Schmitz Analysis of DNA modifications, Analytical and Bioanalytical Chemistry 384 (2006) 34-36

2005

[16]   S. Droste, M. Schellenträger, M. Constapel, S. Gäb, M. Lorenz, K. J. Brockmann, T. Benter, D. Lubda, O. J. Schmitz* A Silica-based Monolithic Column in capillary-HPLC and CEC coupled with ESI- MS or ES-APLI-MS, Electrophoresis 26 (2005) 4098-4103

[15]   M. Corcoran, A. Parker, J. Orchard, Z. Davis, M. Wirtz, O. J. Schmitz, D. Oscier ZAP-70 methylation status is associated with ZAP-70 expression status in chronic lymphocytic leukemia, Haematologica 90 (2005) 1078-1088

[14]   M. Wirtz, C. A. Schumann, M. Schellenträger, S. Gäb, J. vom Brocke, M. L. A. Podeschwa, H.-J. Altenbach, D. Oscier, O. J. Schmitz* CE-LIF analysis of endogenous damage in mitochondrial and genomic DNA, Electrophoresis 26 (2005) 2599-2607

[13]   M. Constapel, M. Schellenträger, O. J. Schmitz, S. Gäb, K. J. Brockmann, R. Giese, T. Benter Atmospheric-Pressure Laser Ionization: A Novel Ionization Method for Liquid Chromatography – Mass Spectrometry, Rapid Communication in Mass Spectrometry 19 (2005) 326-336

2004

[12]   F. Lyko, D. Stach, A. Benner, S. Stilgenbauer, H. Döhner, M. Wirtz, M. Wießler, O. J. Schmitz* Quantitative analysis of DNA methylation in chronic lymphocytic leukemia patients, Electrophoresis 25 (2004) 1530-1535

[11]   M. Wirtz, D. Stach, H.-C. Kliem, M. Wiessler, O. J. Schmitz* Determination of the DNA methylation level in tumor cells by capillary electrophoresis and laser-induced-fluorescence detection, Electrophoresis 25 (2004) 839-845

2003

[10]   D. Stach, O. J. Schmitz, S. Stilgenbauer, A. Benner, H. Döhner, M. Wießler, F. Lyko Capillary electrophoretic analysis of genomic DNA methylation levels, Nucleic Acids Research 31 (2003) e2

2002

[9]   O. J. Schmitz, C. Wörth, D. Stach, M. Wießler DNA adducts as biomarkers for carcinogenesis analysed by capillary electrophoresis, Angewandte Chemie Int. Ed. 41 (2002) 445-448 and Angewandte Chemie 114 (2002) 461-464

2001

[8]   D. Stach, O. J. Schmitz* Decrease in concentration of free catechins in tea over time determined by micellar electrokinetic chromatography, Journal of Chromatography A 924 (2001) 519-522

2000

[7]   C. C. T. Wörth, M. Wießler, O. J. Schmitz* Analysis of catechins and caffeine in tea extracts by micellar electrokinetic chromatography, Electrophoresis 21 (2000) 3634-3638

[6]   O. J. Schmitz, E. Richter Capillary Zone Electrophoresis with On-Line Blotting for Separation and Detection of 32P-postlabeled DNA-Adducts, Biomarkers 5(4) (2000) 314-321

[5]   C. C. T. Wörth, O. J. Schmitz, M. Wießler Synthesis of fluorescently labeled alkylated DNA-adduct standards and separation by capillary electrophoresis, Electrophoresis 21 (2000) 2086-2091

[4]   K.-C. Schroff, P. Lovich, O. J. Schmitz, S. Aschhoff, E. Richter, J. Remien Effects of cotinine at cholinergic nicotinic receptors of the sympathetic superior cervical ganglion of the mouse, Toxicology 144 (2000) 99-105

1998

[3]   O. J. Schmitz, D. Melchior, W. Schuhmann, S. Gäb Postcolumn derivatisation for selective laser-induced fluorescence detection in MEKC of fatty acid hydroperoxides, Journal of Chromatography A 814 (1998) 261-265

1997

[2]   O. J. Schmitz, S. Gäb Separation of unsaturated fatty acids and related isomeric hydroperoxides by micellar electrokinetic chromatography, Journal of Chromatography A 781 (1997) 215-221

[1]   O. J. Schmitz, S. Gäb Separation of isomeric hydroperoxides of unsaturated fatty acids by CE, Journal of Chromatography A 767 (1997) 249-253

* corresponding author