TY - CONF A1 - Hoffmann, Holger A1 - Knizia, Christian A1 - Panne, Ulrich A1 - Schneider, Rudolf T1 - Evaluation of a polyclonal anti-sulfamethoxazole and a monoclonal anti-estrone antibody in different types of environmental water samples T2 - 15th International Conference on Chemistry and the Environment (EuChems) CY - Leipzig DA - 2015-09-20 PY - 2015 AN - OPUS4-34515 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sötebier, Carina A1 - Bierkandt, Frank A1 - Jakubowski, Norbert A1 - Panne, Ulrich A1 - Weidner, Steffen T1 - Analysis of Silver Nanoparticles Using AF4 Coupled to ICP-MS: Investigating Sample Loss and Recovery Rates T2 - 10th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials ICEENN 2015 CY - Vienna, Austria DA - 2015-09-06 PY - 2015 AN - OPUS4-34098 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jakubowski, Norbert A1 - Lindner, Uwe A1 - Lingott, Jana A1 - Panne, Ulrich A1 - Richter, Silke T1 - Determination and Speciation of Lanthanoides by ICP-MS T2 - Analysis of Rare Earth Elements, Methods and Application (AREE 2015) CY - Kleve, Germany DA - 2015-10-05 PY - 2015 AN - OPUS4-34523 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Unger, Wolfgang A1 - Dietrich, Paul A1 - Nietzold, Carolin A1 - Ivanov-Pankov, S. A1 - Lippitz, Andreas A1 - Weigel, W. A1 - Panne, Ulrich T1 - Surface Chemical Analysis of Carbohydrates on Epoxy-Functionalized Surfaces T2 - 16th European Conference on Applications of Surface and Interface Analysis (ECASIA 15) CY - Granada, Spain DA - 2015-09-28 PY - 2015 AN - OPUS4-34812 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Demidov, Alexandr A1 - Eschlboeck-Fuchs, S A1 - Gornushkin, Igor B. A1 - Huber, N. A1 - Heitz, J. A1 - Roessler, R. A1 - Schmid, Thomas A1 - Panne, Ulrich T1 - Two calibration-free approaches of analysis of industrial oxides by laser-induced breakdown spectroskopy T2 - EMSLIBS 2015 CY - Linz, Austria DA - 2015-09-14 PY - 2015 AN - OPUS4-35166 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Richter, Janine A1 - Fettig, Ina A1 - Philipp, Rosemarie A1 - Jakubowski, Norbert A1 - Panne, Ulrich T1 - Critical pollutant tributyltin in surface water systems T2 - ICCE 2015 CY - Leipzig, Germany DA - 2015-09-20 PY - 2015 AN - OPUS4-35001 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Michalik-Onichimowska, Aleksandra A1 - Riedel, Jens A1 - Panne, Ulrich T1 - Monitoring of Thiol-Ene Coupling by Mass Spectrometry and Ion Mobility Spectrometry N2 - The carbon-sulfur bond is frequently occurring in natural products and pharmaceuticals. In a wide range of industrial applications such as polymers and bioorganic functionalization, biomaterials and nanostructured networks formation and microdevice fabrication the targeted construction of C-S bonds is being synthetically important. The synthesis of thioethers is mainly conducted by radical thiol-ene click reactions typically initiated by thermal or UV activation of a radical initiator or direct radical formation via UV irradiation. The reported conversion yields are high after relatively short irradiation times, thus, a fast reaction monitoring is necessary to optimize reaction conditions in terms of total yield and occurrence of undesired by-products. Especially for fast reactions, rapid response is the key feature for online monitoring. The latter gets increasingly important in process analytical approaches for quality assurance and to better control the conversion rate by feedback control. For a headspace analysis, gas detection methods like ion mobility spectrometry (IMS) and mass spectrometry (MS) are especially suitable to this aim since they provide response times in the ms - s range. Moreover, as complementary methods they provide comprehensive information about the molecule and it's structure. The aim of the work is to qualitatively interrogate the sample composition of a photocatalytically initiated thiol-ene coupling in real time. This contribution presents primary results of direct analysis of the photoinitiated synthesis of methyl 2-((tert-butoxycarbonyl)amino)-3-((3-hydroxypropyl)thio) propanoate by IMS and MS utilizing different ionization sources. The thiol-ene reaction is performed between N-Boc-cysteine methyl ester and allyl alcohol utilizing Ru(bpz)3(PF6)2 catalyst as a photoinitiator and p-toluidine as a redox mediator, irradiated at 450 nm according to the procedure presented in [2]. The obtained results were validated by NMR analysis unambiguously indicating the formation of the newly formed C-S bond and additionally providing total reaction yield calibration curves for a quantitative analysis. T2 - ESCRE 2015 CY - München DA - 2015-10-27 PY - 2015 AN - OPUS4-34779 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wagner, Sabine A1 - Wan, Wei A1 - Biyikal, Mustafa A1 - Panne, Ulrich A1 - Rurack, Knut A1 - Carrasco, Sergio A1 - Moreno-Bondi, Maria C. T1 - Fluorescent Nanosensor based on Molecularly Imprinted Polymer for the Detection of Contaminants in Water N2 - As the interest in rapid and sensitive detection methods is growing, molecularly imprinted polymers (MIPs) are increasingly considered as an alternative to bio-macromolecular recognition units such as antibodies or enzymes due to their facilely tailorable selectivity towards certain analytes or a group of structurally related species. The low production costs, stability, robustness and format adaptability of MIPs combined with the possibility to imprint and thus their ability to recognize a wide variety of target analytes can be potentially useful in chemical sensor applications.[1] With regard to optical sensing technologies, however, MIPs have only been used in considerably few applications, especially in fluorescence sensors. This limitation is basically due to the fact that the incorporation of a fluorescently responding moiety into a polymer matrix is a challenge. One way to overcome this limitation is to use tailor-made fluorescent indicator monomers and thin MIP-shells on silica particles.[2] Here, we present silica sensor particles with a thin MIP layer which was grown onto the silica surface via reversible addition-fragmentation chain transfer (RAFT) polymerization. The homogeneous MIP shell contains fluorescent phenoxazine-urea monomers as signal generation elements. The carboxylate salts of the antibiotic ampicillin (AMPI) and the herbicide 2,4 dichlorophenoxyacetic acid (2,4-D) were used as templates in those studies. In this case, hydrogen bonds are formed between the urea group of the fluorescent monomer and the carboxylate group of the template. To investigate the binding behavior of the MIPs and the control non-imprinted polymer (NIP) particles in terms of discrimination and imprinting factor, titration experiments with AMPI and 2,4-D salts were performed directly in organic solution. In order to study the detection possibilities in aqueous solution, a simple phase-transfer assay using fluorescence spectroscopy was investigated for both analytes. T2 - Adlershofer Forschungsforum 2016 CY - Berlin, Germany DA - 2015-11-11 PY - 2015 AN - OPUS4-35238 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Michalik-Onichimowska, Aleksandra A1 - Riedel, Jens A1 - Panne, Ulrich A1 - Löhmannsröben, Hans-Gerd A1 - Beitz, Toralf T1 - The effect of laser pulse duration on atmospheric pressure IR-MALDI using liquid matrices N2 - Matrix assisted laser desorption/ionization using liquid matrices and infrared laser irradiation (liquid IR-MALDI) is an attractive detection scheme since it enables a direct coupling to liquid chromatographic separation techniques.1 Albeit extensive studies have been targeted to achieve a more general understanding of the underlying ionization mechanism, the exact role of individual contributions, such as thermal vaporization, phase explosion or photoablation, could not be exhaustively identified.2 This contribution will present a direct comparison of ion mobility (IM) spectra obtained by utilizing an optical parametric oscillator and an Er:YAG laser, both operating at a central wavelength of = 2.94 µm, but with temporal pulse widths of 7 ns or several hundred µs, respectively. Thus, the resulting peak power of the Er:YAG laser is three orders of magnitude smaller than that of the OPO, however supplies a tenfold higher energy per pulse. In addition to the mere detection efficiencies, analysis of the IM spectrometric results gives insights into the initial solvation state of the formed ions. Accompanying high speed shadowgraphy imaging experiments contribute towards a better understanding of the involved liquid-gas phase transition dynamics. T2 - Bunsentagung 2015 CY - Bochum DA - 2015-05-14 PY - 2015 AN - OPUS4-34777 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zhang, Zhiyang A1 - Buurman, Merwe A1 - Panne, Ulrich A1 - Kneipp, Janina A1 - Merk, Verginia T1 - SERS characterization of photo-induced dimerization N2 - Dimercaptoazobenzene (DMAB) can be formed from different precursors (e.g., p-Nitrothiophenol and p-Aminothiophenol, see also examples in Figure) by a reaction that can be influenced by localized surface plasmons.[1] Many reaction parameters were shown to influence the pathway of DMAB formation. The mechanism of DMAB formation is studied by surface enhanced Raman scattering (SERS). It is very interesting to delineate effects due to properties of the reacting molecular species and those related to the plasmonic properties of the nanostructures. Currently, we achieve this e.g., by the comparison of the usage of nanoparticle solutions and immobilized nanoparticles.[2] We perform this work, since we aim at modifying and controlling the reaction conditions precisely in microscopic volumes, exploiting the multifunctional properties of different plasmonic nanoparticles [3]. In our poster, we will show and discuss SERS data obtained in experiments at varying reaction and excitation conditions. T2 - Molecular Plasmonics 2015 CY - Jena, Germany DA - 2015-05-07 PY - 2015 AN - OPUS4-34662 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -