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Organisationseinheit der BAM
- 1 Analytische Chemie; Referenzmaterialien (1087) (entfernen)
Paper des Monats
- ja (12)
Laser induced plasma (LIP) is a dynamic, short living event which presents significant difficulty for modeling. In this report, a collisional-dominated chemical model developed earlier* is expanded by the inclusion of a new method for calculation of chemical reactions. The model consists of the coupled Navier-Stokes, state, radiative transfer, material transport, and chemical equations. The latter are written in terms of atomic and molecular partition functions rather than reaction rates. Typically, a solution of such the system of chemical equations is difficult for the entire range of plasma temperatures and densities because reaction constants may vary by hundreds orders of magnitude owing to extreme plasma conditions. No numerical solver of non-linear systems of equations handles this situation with ease. We resolve the problem by using a hierarchical approach. First, we rank the reactions according to their ascendancy. Second, we exploit either the contraction or Newton-Raphson algorithms to solve the system of chemical equations. We illustrate the approach by performing a series of calculations for reacting species Si, C, N, Ca, Cl and their molecules in laser induced plasmas.
This course will provide an introduction to plasma diagnostic techniques. The major focus of the course will be on the discussions of the practical procedures as well as the underlying physical principles for the measurements of plasma fundamental characteristics (e.g., temperatures, thermodynamic properties, and electron number density). Particular emphasis will be placed on inductively coupled plasma–atomic emission spectrometry, but other analytical plasmas will also be used as examples when appropriate. Selected examples on how one can manipulate the operating conditions of the plasma source, based on the results of plasma diagnostic measurements, to improve its performance used for spectrochemical analysis will also be covered. Topics to be covered include thermal equilibrium, line profiles, temperatures, electron densities, excitation processes, microreactions, pump and probe diagnostics, tomography, temporal and spatial resolution. Basis of plasma computer modeling will be presented.
Biotransformation processes of fluopyram (FLP), a new succinate dehydrogenase inhibitor (SDHI) fungicide, were investigated by electrochemistry (EC) coupled online to liquid chromatography (LC) and electrospray mass spectrometry (ESI-MS). Oxidative phase I metabolite production was achieved using an electrochemical flow-through cell equipped with a boron doped diamond (BDD) electrode. Structural elucidation and prediction of oxidative metabolism pathways were assured by retention time, isotopic patterns, fragmentation, and accurate mass measurements using EC/LC/MS, LC-MS/MS, and/or high resolution mass spectrometry (HRMS). The results obtained by EC were compared with conventional in vitro studies by incubating FLP with rat and human liver microsomes (RLM, HLM). Known phase I metabolites of FLP (benzamide, benzoic acid, 7-hydroxyl, 8-hydroxyl, 7,8-dihydroxyl FLP, lactam FLP, pyridyl acetic acid, and Z/E-olefin FLP) were successfully simulated by EC/LC/MS. New metabolites including an imide, hydroxyl lactam, and 7-hydroxyl pyridyl acetic acid oxidative metabolites were predicted for the first time in our study using EC/LC/MS and liver microsomes. We found oxidation by dechlorination to be one of the major metabolism mechanisms of FLP. Thus, our results revealed that EC/LC/MS-based metabolic elucidation was more advantageous on time and cost of analysis and enabled matrix-free detection with valuable information about the mechanisms and intermediates of metabolism processes.
Online coupling of electrochemistry with mass spectrometry (EC/MS) is highly promising for prediction and simulation of metabolic processes of xenobiotics in living organisms. Less time and cost of analysis, matrix free detection, and automation make EC/MS-based metabolomics superior over traditional in-vivo and in-vitro methods. Furthermore, EC/MS has a special feature to identify reactive intermediates and reaction mechanisms.
The main objective of this work was to simulate biotransformation processes of pesticides by EC/MS and to elucidate the Transformation products (TPs). We have studied the oxidative phase I metabolism processes of selected pesticides by EC/MS or with liquid chromatography (EC/LC/MS) and compared the derived TPs with cytochrome based metabolites. The electrochemical TPs were produced by boron-doped diamond electrode, separated by LC, and detected by single quadrupole ESI-MS online. Structural identification of both electrochemical oxidation and liver microsome metabolites were based on accurate mass measurements by FT-ICR high-resolution mass spectrometry, isotopic pattern, MS/MS fragmentation, and Retention time alignments.
Main phase I oxidative metabolites by P-oxidation, N- & O- dealkylation, dechlorination, hydroxylation, and -OH- oxidation have been identified. Many targeted and untargeted metabolites have been identified by EC/(LC)/MS. Additionally, reactive species have been trapped online by biomolecules to study phase II conjugative reactions. Furthermore, we synthesized TP standards by EC/MS and applied them for pesticide's TPs occurrence investigation in foodstuf matrices.
Tandem MS techniques are widely used for both, structure and sequence elucidation of biopolymers. Thereby, fragmentation activation is realized by various methods, for example with lasers or collisions with neutral gases. In this study, we present a new Tandem MS system using a commercially available vacuum ultraviolet lamp. On the one hand, this approach provides efficient fragmentation in both ionization modes, positive as well as negative. On the other hand, it enables an additional previously not achieved post ionization of the fragments. While the first results in atypical fragment patterns and, thus provides orthogonal information, the second is crucial especially to identify low abundant ions.
Heritage Lecture
(2018)
After finishing my diploma thesis in plasma physics in 1981, I dreamt of a future in a research lab to develop novel fusion reactors for energy production or to study universal plasmas and their emission in the cosmos. This dream never became real, however I found my first job in a team to build up a new museum dedicated to “Energy”, and this first part of my career was already finished after a year, because the funding was not extended. So, I found immediately a new job as a young scientist in the institute for analytical sciences (originally ISAS: Institute for Plasmachemistry and Applied Spectroscopy) in 1982 to develop novel plasma ion sources for inorganic mass spectrometry. The first source of interest was based on a glow discharge for direct analysis of conducting solids (technically supported by Finnigan MAT, Bremen). Here I adopted the design of the Grimm type discharge for the first time, which was well known in optical emission spectroscopy, and coupled it to a quadrupole mass analyzer. The advantage of this design was that flat craters are produced by sputtering which made this source very powerful for in-depth analysis of technical layers. This then became the topic of my PhD, which was not originally planned, and I had to learn a lot about surface analysis. However, since the first project was too successful we established a small team (in cooperation with Jose Broekaert - an expert in ICP-OES) which started with the development of our own inductively coupled plasma ion source in 1986 coupled to a quadrupole and in 1989 to a sector field mass spectrometer (funded by the Minister of Science and Technology; again in cooperation with Finnigan MAT). The latter device was launched to the market in 1993 as the Element 1.
The second decade of my career was still related to instrumental development but mainly of glow discharge sources. In an EU funded project first an automated glow discharge sector field instrument was developed where the Grimm type geometry was combined with a fast flow concept (in cooperation with Volker Hoffmann at IFW in Dresden). This was done in cooperation with VG (which became later a part of Thermo Fisher Scientific together with Finnigan MAT), so that it is not surprising that this concept for the Element GD. This project was later continued in the third phase of my career, again funded by the EU and in cooperation with the group of Alfredo Sanz-Medel (Rosario Pereiro and Jorge Pisonero), to develop a fast flow, but now rf-powered GD ion source in combination with a time-of-flight mass spectrometer, which was later launched to the market commercially by Horiba Jobin Yvon (France) for in-depth profiling of thin layers even of non-conducting materials.
In the first decade of my career I started to study already “analytical chemistry” from the scratch because the instruments developed have been applied now for direct analysis of solid materials, technical layers and environmental samples. In case of environmental applications our ICP-MS (the quadrupole and the sector field instrument) was coupled with separation techniques, so that this period of instrumental development was dominated in the second decade by development of high efficiency sample introduction systems in combination with speciation studies of Pt group elements, arsenic, selenium and phosphorus (in DNA and phosphorylated proteins), Ni and Cr. Additionally, we continued with the analysis of solid ceramic materials (Al2O3, SiC, SiN) and ambient air-born particles. At the end of the second decade we complemented our instrumental pool by a collision and reaction cell instrument in cooperation with Micromass and used this instrument for speciation studies of peptides and proteins and demonstrated that by ICP-HEX-MS quantitative proteomics is feasible. Therefore, we more and more focused in the following years on metalloproteins and published a famous paper on “Metallobiomolecules: The basis of life, the challenge of atomic spectroscopy” (together with Luc Moens and Ryszard Lobinski). For detection of metalloproteins we applied typical workflows of biochemistry and proteomics, for which I had to extend my knowledge about biochemistry and proteomics. As a new analytical tool, we used a homemade laser ablation cell for sample introduction of metalloproteins after their separation by gel electrophoresis and extended this work by applying metal-tagging of antibodies for Western blot assays. For this purpose, proteins were separated in SDS-PAGE and electroblotted onto membranes. Specific detection of proteins even not containing any metal could be performed by laser ablation ICP-MS using the metal tagged antibodies for indirect detection. This research was interrupted in 2009 by a movement from ISAS (where atomic spectroscopy was declining) to BAM (the Federal Institute for Materials Research and Testing, Berlin) where this research direction was fostered. The experience we achieved at ISAS in the previously mentioned projects were now used here at BAM in the fourth decade for materials research and the development of a quantitative elemental microscope with cellular resolution. So, at the end of my career I am trying to apply all my knowledge and expertise to develop analytical methods and to apply multimodal spectroscopies to decipher the construction code of the cellular machinery, which is the most precise and complex machinery I have ever seen. If we were able to understand how this machinery works, we can better diagnose and treat a malfunction in case of the development of a disease.
Finally, I can conclude that lifelong learning starts before school but does not end at the end of this lecture. It looks like this heritage lecture will be focused on my career only, but this is not the case because some highlights of my career will be used to illustrate a few universal principles: how to have fun, how to find friends and how this all leads to an increase of joy and joy is the basis of new ideas (which must not always be related to your profession) and novel ideas are essential for a successful and satisfying career. So, this heritage lecture wants to answer the most important question of a life which was dedicated to plasma spectrochemistry:
1) Is it possible - at all - to have fun in this research direction?
2) Can we learn already today what we need tomorrow?
3) How can we still realize our scientific dreams of cutting edge research in times of cutting budgets? Which automatically leads to the next question:
4) Is necessity the mother of invention?
All questions will be answered! Controversial discussions (for angry or disappointed colleagues) will be stimulated and my visions of future research (for students and postdocs) and instrumental developments (for manufacturer) will be presented. Finally, conclusions will be drawn by the auditorium (everybody) and thanks will be given to Ramon Barnes (by me) already in advance!
Heritage Lecture
(2018)
After finishing my diploma thesis in plasma physics in 1981, I dreamt of a future in a research lab to develop novel fusion reactors for energy production or to study universal plasmas and their emission in the cosmos. This dream never became real, however I found my first job in a team to build up a new museum dedicated to “Energy”, and this first part of my career was already finished after a year, because the funding was not extended. So, I found immediately a new job as a young scientist in the institute for analytical sciences (originally ISAS: Institute for Plasmachemistry and Applied Spectroscopy) in 1982 to develop novel plasma ion sources for inorganic mass spectrometry. The first source of interest was based on a glow discharge for direct analysis of conducting solids (technically supported by Finnigan MAT, Bremen). Here I adopted the design of the Grimm type discharge for the first time, which was well known in optical emission spectroscopy, and coupled it to a quadrupole mass analyzer. The advantage of this design was that flat craters are produced by sputtering which made this source very powerful for in-depth analysis of technical layers. This then became the topic of my PhD, which was not originally planned, and I had to learn a lot about surface analysis. However, since the first project was too successful we established a small team (in cooperation with Jose Broekaert - an expert in ICP-OES) which started with the development of our own inductively coupled plasma ion source in 1986 coupled to a quadrupole and in 1989 to a sector field mass spectrometer (funded by the Minister of Science and Technology; again in cooperation with Finnigan MAT). The latter device was launched to the market in 1993 as the Element 1.
The second decade of my career was still related to instrumental development but mainly of glow discharge sources. In an EU funded project first an automated glow discharge sector field instrument was developed where the Grimm type geometry was combined with a fast flow concept (in cooperation with Volker Hoffmann at IFW in Dresden). This was done in cooperation with VG (which became later a part of Thermo Fisher Scientific together with Finnigan MAT), so that it is not surprising that this concept for the Element GD. This project was later continued in the third phase of my career, again funded by the EU and in cooperation with the group of Alfredo Sanz-Medel (Rosario Pereiro and Jorge Pisonero), to develop a fast flow, but now rf-powered GD ion source in combination with a time-of-flight mass spectrometer, which was later launched to the market commercially by Horiba Jobin Yvon (France) for in-depth profiling of thin layers even of non-conducting materials.
In the first decade of my career I started to study already “analytical chemistry” from the scratch because the instruments developed have been applied now for direct analysis of solid materials, technical layers and environmental samples. In case of environmental applications our ICP-MS (the quadrupole and the sector field instrument) was coupled with separation techniques, so that this period of instrumental development was dominated in the second decade by development of high efficiency sample introduction systems in combination with speciation studies of Pt group elements, arsenic, selenium and phosphorus (in DNA and phosphorylated proteins), Ni and Cr. Additionally, we continued with the analysis of solid ceramic materials (Al2O3, SiC, SiN) and ambient air-born particles. At the end of the second decade we complemented our instrumental pool by a collision and reaction cell instrument in cooperation with Micromass and used this instrument for speciation studies of peptides and proteins and demonstrated that by ICP-HEX-MS quantitative proteomics is feasible. Therefore, we more and more focused in the following years on metalloproteins and published a famous paper on “Metallobiomolecules: The basis of life, the challenge of atomic spectroscopy” (together with Luc Moens and Ryszard Lobinski). For detection of metalloproteins we applied typical workflows of biochemistry and proteomics, for which I had to extend my knowledge about biochemistry and proteomics. As a new analytical tool, we used a homemade laser ablation cell for sample introduction of metalloproteins after their separation by gel electrophoresis and extended this work by applying metal-tagging of antibodies for Western blot assays. For this purpose, proteins were separated in SDS-PAGE and electroblotted onto membranes. Specific detection of proteins even not containing any metal could be performed by laser ablation ICP-MS using the metal tagged antibodies for indirect detection. This research was interrupted in 2009 by a movement from ISAS (where atomic spectroscopy was declining) to BAM (the Federal Institute for Materials Research and Testing, Berlin) where this research direction was fostered. The experience we achieved at ISAS in the previously mentioned projects were now used here at BAM in the fourth decade for materials research and the development of a quantitative elemental microscope with cellular resolution. So, at the end of my career I am trying to apply all my knowledge and expertise to develop analytical methods and to apply multimodal spectroscopies to decipher the construction code of the cellular machinery, which is the most precise and complex machinery I have ever seen. If we were able to understand how this machinery works, we can better diagnose and treat a malfunction in case of the development of a disease.
Finally, I can conclude that lifelong learning starts before school but does not end at the end of this lecture. It looks like this heritage lecture will be focused on my career only, but this is not the case because some highlights of my career will be used to illustrate a few universal principles: how to have fun, how to find friends and how this all leads to an increase of joy and joy is the basis of new ideas (which must not always be related to your profession) and novel ideas are essential for a successful and satisfying career. So, this heritage lecture wants to answer the most important question of a life which was dedicated to plasma spectrochemistry:
1) Is it possible - at all - to have fun in this research direction?
2) Can we learn already today what we need tomorrow?
3) How can we still realize our scientific dreams of cutting edge research in times of cutting budgets? Which automatically leads to the next question:
4) Is necessity the mother of invention?
All questions will be answered! Controversial discussions (for angry or disappointed colleagues) will be stimulated and my visions of future research (for students and postdocs) and instrumental developments (for manufacturer) will be presented. Finally, conclusions will be drawn by the auditorium (everybody) and thanks will be given to Ramon Barnes (by me) already in advance!
qNMR provides the most universally applicable form of direct concentration or purity determination without need for reference materials of impurities or the calculation of response factors but only exhibiting suitable NMR properties.
The workshop presents basic terms of statistics and uncertainty analysis, which are the basis for qNMR spectroscopy and data analysis such as, e.g., standard deviations, linear regression, significance tests, etc. and gives typical examples of applications in qNMR spectroscopy.
The departure from the current automation landscape to next generation automation concepts for the process industry has already begun. Smart functions of sensors simplify their use and enable plug-and-play integration, even though they may appear to be more complex at first sight. Monitoring specific information (i.e., “chemical” such as physico-chemical properties, chemical reactions, etc.) is the key to “chemical” process control.
The talk introduces a smart online NMR sensor module provided in an explosion proof housing as example. This sensor was developed for an intensified industrial process (pharmaceutical lithiation reaction step) funded by the EU’s Horizon 2020 research and innovation programme (www.consens-spire.eu). Due to NMR spectroscopy as an “absolute analytical comparison method”, independent of the matrix, it runs with extremely short set-up times in combination with “modular” spectral models. Such models can simply be built upon pure component NMR spectra within a few hours (i.e., assignment of the NMR signals to the components) instead of tedious calibrations runs.
The talk also generally covers current aspects of high-field and low-field online NMR spectroscopy for reaction monitoring and process control and gives also an overview on direct dissolution studies of API cocrystals.
The quality of research antibodies is an issue for decades. Although several papers have been published to improve the situation, their impact seems to be limited. This publication makes the effort to simplify the description of validation criteria in a way that the occasional antibody user is able to assess the validation level of an immunochemical reagent. A simple, 1-page checklist is supplied for the practical application of these criteria.