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  1. Article: Structural characterization of melanoidin formed from d-glucose and l-alanine at different temperatures applying FTIR, NMR, EPR, and MALDI-ToF-MS

    Mohsin, Ghassan Faisal / Franz-Josef Schmitt / Clemens Kanzler / Jan Dirk Epping / Sabine Flemig / Andrea Hornemann

    Food chemistry. 2018 Apr. 15, v. 245

    2018  

    Abstract: The aim of this study was to identify specific chemical bonds and characteristic structures in melanoidins formed from d-glucose and l-alanine between 130 and 200 °C. The results might be used to control the type and amount of melanoidin produced during ... ...

    Abstract The aim of this study was to identify specific chemical bonds and characteristic structures in melanoidins formed from d-glucose and l-alanine between 130 and 200 °C. The results might be used to control the type and amount of melanoidin produced during food processing. For this purpose, complementary techniques, such as FTIR, NMR, EPR, and MALDI-ToF, were employed. At 160 °C color, solubility and UV/Vis absorption change characteristically and consequently, structural transformations could be observed in FTIR and NMR spectra. For example, sharp signals of N-H, C-N, and C-H oscillations in the l-alanine spectrum are prone to inhomogeneous broadening in melanoidins prepared above 150 °C. These changes are caused due to formation of heterogeneous macromolecular structures and occur during condensation reactions that lead to an increasing loss of water from the melanoidins with increasing temperatures. Additionally, MALDI-ToF-MS indicates the polymerization of glyoxal/glyoxylic acid and EPR shows the formation of radical structures.
    Keywords Fourier transform infrared spectroscopy ; absorption ; alanine ; chemical bonding ; color ; condensation reactions ; electron paramagnetic resonance spectroscopy ; food processing ; glucose ; glyoxylic acid ; melanoidins ; nuclear magnetic resonance spectroscopy ; polymerization ; solubility ; temperature
    Language English
    Dates of publication 2018-0415
    Size p. 761-767.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 243123-3
    ISSN 1873-7072 ; 0308-8146
    ISSN (online) 1873-7072
    ISSN 0308-8146
    DOI 10.1016/j.foodchem.2017.11.115
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Correction to Infrared Nanospectroscopy of Phospholipid and Surfactin Monolayer Domains

    Bernd Kästner / C. Magnus Johnson / Peter Hermann / Mattias Kruskopf / Klaus Pierz / Arne Hoehl / Andrea Hornemann / Georg Ulrich / Jakob Fehmel / Piotr Patoka / Eckard Rühl / Gerhard Ulm

    ACS Omega, Vol 5, Iss 25, Pp 15762-

    2020  Volume 15762

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2020-06-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Infrared Nanospectroscopy of Phospholipid and Surfactin Monolayer Domains

    Bernd Kästner / C. Magnus Johnson / Peter Hermann / Mattias Kruskopf / Klaus Pierz / Arne Hoehl / Andrea Hornemann / Georg Ulrich / Jakob Fehmel / Piotr Patoka / Eckart Rühl / Gerhard Ulm

    ACS Omega, Vol 3, Iss 4, Pp 4141-

    2018  Volume 4147

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2018-04-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: A methodological inter-comparison study on the detection of surface contaminant sodium dodecyl sulfate applying ambient- and vacuum-based techniques

    Giovannozzi, Andrea M / Andrea Hornemann / Beatrix Pollakowski-Herrmann / Felicia M. Green / Paul Gunning / Tara L. Salter / Rory T. Steven / Josephine Bunch / Chiara Portesi / Bonnie J. Tyler / Burkhard Beckhoff / Andrea Mario Rossi

    Analytical and bioanalytical chemistry. 2019 Jan., v. 411, no. 1

    2019  

    Abstract: Biomedical devices are complex products requiring numerous assembly steps along the industrial process chain, which can carry the potential of surface contamination. Cleanliness has to be analytically assessed with respect to ensuring safety and efficacy. ...

    Abstract Biomedical devices are complex products requiring numerous assembly steps along the industrial process chain, which can carry the potential of surface contamination. Cleanliness has to be analytically assessed with respect to ensuring safety and efficacy. Although several analytical techniques are routinely employed for such evaluation, a reliable analysis chain that guarantees metrological traceability and quantification capability is desirable. This calls for analytical tools that are cascaded in a sensible way to immediately identify and localize possible contamination, both qualitatively and quantitatively. In this systematic inter-comparative approach, we produced and characterized sodium dodecyl sulfate (SDS) films mimicking contamination on inorganic and organic substrates, with potential use as reference materials for ambient techniques, i.e., ambient mass spectrometry (AMS), infrared and Raman spectroscopy, to reliably determine amounts of contamination. Non-invasive and complementary vibrational spectroscopy techniques offer a priori chemical identification with integrated chemical imaging tools to follow the contaminant distribution, even on devices with complex geometry. AMS also provides fingerprint outputs for a fast qualitative identification of surface contaminations to be used at the end of the traceability chain due to its ablative effect on the sample. To absolutely determine the mass of SDS, the vacuum-based reference-free technique X-ray fluorescence was employed for calibration. Convex hip liners were deliberately contaminated with SDS to emulate real biomedical devices with an industrially relevant substance. Implementation of the aforementioned analytical techniques is discussed with respect to combining multimodal technical setups to decrease uncertainties that may arise if a single technique approach is adopted. Graphical abstract ᅟ
    Keywords Raman spectroscopy ; X-ray fluorescence spectroscopy ; fluorescence ; geometry ; image analysis ; mass spectrometry ; medical equipment ; sodium dodecyl sulfate ; traceability ; uncertainty
    Language English
    Dates of publication 2019-01
    Size p. 217-229.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ISSN 1618-2642
    DOI 10.1007/s00216-018-1431-x
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