Дисертації з теми "NQR Spectrometer"
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Kachkachi, Noreddine. "Spectromètre RQN à base d’un SoC-FPGA : Conception numérique, vérification fonctionnelle et validation expérimentale." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0053.
Повний текст джерелаNuclear Quadrupolar Resonance (NQR) is a radio frequency spectroscopy technique that is very useful for non-invasive identification and analysis of chemical products. However, it suffers from low sensitivity which makes its instrumentation very challenging. In order to tackle these challenges and enhance the performances, especially sensitivity,we present in this thesis a solution which consists in a SoC-FPGA based compact spectrometer, where all the major digital hardware and software modules are integrated on a single System On Chip, including : a high pulse width resolution pulse programmer, a fully controllable transmitter, an acquisition module with real time digital signal processing, and storage of the acquired signal in an external memory, and a hardware debugger, in addition to embedded Linux applications that drive the spectrometer functionalities. This digital integration and miniaturisation brought noticeable performances of the spectrometers' overall functionality, especially in terms of sensitivity and portability. The designed spectrometer was successfully tested on several representative samples
Ariando, David Joseph. "A Portable Low-Cost NMR Spectrometer." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1515170982121573.
Повний текст джерелаDigby, Megan Elizabeth. "Broadband DC SQUID NMR spectrometry on metals." Thesis, Royal Holloway, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322702.
Повний текст джерелаBarlow, G. K. "Development and application of some techniques for proton and sodium NMR." Thesis, University of York, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383846.
Повний текст джерелаGädke, Achim, Markus Rosenstihl, Christopher Schmitt, Holger Stork, and Nikolaus Nestle. "DAMARIS – a flexible and open software platform for NMR spectrometer control." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194317.
Повний текст джерелаPersson, Josef. "Measurement of Reduction Efficiency in Green Liquor Using a NIR Spectrometer." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-318.
Повний текст джерелаHughes, Leslie Peter. "Maximum entropy methods applied to NMR and mass spectrometry." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3785/.
Повний текст джерелаVilenius, Esa. "On the analysis of near-infrared point spectrometer data for the investigation of lunar surface mineralogy." [Katlenburg-Lindau] Copernicus Publ.***5004719, 2009. http://d-nb.info/996869182/04.
Повний текст джерелаMcGill, Colin Adam. "Studies of low-field nuclear magnetic resonance and Raman spectrometries for process analytical chemistry." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248282.
Повний текст джерелаGouilleux, Boris. "Gradient-based methodson a benchtop spectrometer : new perspectives for low-field NMR spectroscopy." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4036/document.
Повний текст джерелаHigh-field NMR based on superconducting magnets involves an expensive and bulky equipment, which has hampered the use of NMR in harsh environments. A new generation of benchtop NMR spectrometers, compact and cryogen free, has brought NMR spectroscopy under the chemist’s fume-hood and as close as possible to production sites. The driving force of this PhD project is to improve the analytical performance of these benchtop NMR systems. We report here the first implementation of Ultrafast (UF) 2D NMR- a method yielding 2D NMR spectra in a single scan- as well as modern gradient-based solvent suppression methods on a 43 MHz benchtop spectrometer, including a B0-gradient coil. Substantial optimizations have led to UF experiments at low-field (LF) with a reasonable performance while the acquisition duration is reduced by one order of magnitude. Then, the presence of non-deuterated solvents –commonly used in LF NMR– has been tackled by the development of suppression methods both in static and flowing conditions. This methodological effort has opened new opportunities for benchtop NMR applications. Several on- and in-line real-time monitorings have been performed on different types of chemical reactions: Heck-Matsuda coupling reaction, oxidative neutralization of mustard-gas simulants or even the synthesis of a natural product in flow-chemistry. Besides applications to process monitoring, UF 2D NMR at 43 MHz has been successfully applied to discriminate the botanical origins of a panel of edible oils. This fast 2D approach has provided a better classification than standard 1D experiments while remaining compatible with high-throughput analysis
Ajimo, Jacob. "A UV-Visible-NIR, Time-Resolved Fluorescence Spectrometer for High-Pressure Biological Studies." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1134160375.
Повний текст джерелаOriola, Folch Marta. "Non-destructive condition assessment of painting canvases using NIR spectrometry." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/663091.
Повний текст джерелаPagnano, Marco Aurelio de Oliveira. "Automação de um espectrômetro por ressonância magnética nuclear pulsada." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-19082014-101639/.
Повний текст джерелаThis work describes the Project developped to automatize the pulsed nuclear magnetic resonance spectrometer housed in the laboratory of the professors José Pedro Donoso e Cláudio José Magon. To satisfy our needs we have improved their old equipment, at the level of hardware and software. Were built and programmed the parallel interface between the microcomputer and a pulse programmer made by Tecmag Inc. and with a fast digitizer (10 ns) Nicolet 430. The pulse programmer can control 75 independent output channels during 2048 time intervals. The software we developped allow us to control the whole pulse sequence on a very efficient and practical way. It was written in C-language, and provides the timing signals necessary to generate sofisticated pulse seqüencies, the data acquisition and data transfer to the host computer
Motyčka, Lukáš. "Radiofrekvenční metoda detekce výbušnin a drog - NQR." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219982.
Повний текст джерелаWeekes, Anna L. "Design and construction of an ultrasonic probe for use in a Cryo-Magnet NMR Spectrometer." Thesis, Aston University, 1998. http://publications.aston.ac.uk/9612/.
Повний текст джерелаGipson, Geoffrey T. Sokhansanj Bahrad. "Discovery Of discriminative LC-MS and 1H NMR metabolomics markers /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2766.
Повний текст джерелаShah, Siddharth Prakashchandra. "LIPID COMPOSITIONS OF MICROBIAL ORGANISMS ISOLATED FROM EXTREME ENVIRONMENTS AND THEIR IMPLICATION IN THERMO STABILITY OF BACTERIAL CELL MEMBRANE STRUCTURE." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/419298.
Повний текст джерелаPh.D.
Microorganisms with an ability to thrive in harsh environments are referred as “extremophiles”. With advances in biotechnology, interest has grown in the extremophile research because of their unique macromolecules’ characteristics due to their growth environments. Over last decade, researchers have isolated many extremophiles from environments like volcano, salt lakes, hydrothermal vents, deep oceans, Antarctica glaciers etc. Macromolecules of these extremophiles are responsible for their survival in extreme environments. In this research work we have isolated lipid molecules from three different microorganisms. 1) GWE1 strain, a thermophilic bacterium, isolated from dark crusty material from sterilization ovens. 2) 7L strain, a thermophilic bacterium, isolated from Chilean Copahue Volcano. 3) I1P strain, a facultative anaerobe of the family Enterobacteriaceae, recently isolated from Antarctica. Complex lipid arrangement and/or type in the cell membrane are known to affect thermostability of microorganisms and efforts were made to understand the chemical nature of the polar lipids of membrane. In this work, we extracted total lipids from cell membrane, separated them by TLC into various fractions and characterize the lipid structures of fractions with analytical tools such as 1H, 13C, 31P and 2D NMR spectroscopy, ATR-FTIR spectroscopy and MSn spectrometry. In GWE1 strain, we were able to identify glycerophosphoethanolamine, glycerophosphate, glycerophosphoglycerol and cardiolipin lipid classes and an unknown glycerophospholipid class with novel MS/MS spectra pattern. We have also noticed the presence of saturated iso-branched fatty acids with NMR spectra in individual lipid classes. In case of I1P strain, we have identified glycerophosphoglycerol, glycerophosphoethanolamine, glycerophosphate, and acyl glycerophosphoglycerol lipid classes with unsaturated fatty acids in their structure, which could be one of the many reasons for survivability at lower temperatures. In case of 7L strain, we were able to identify glycerophosphoglycerol, cardiolipin, glycerophosphoethanolamine and glycerophosphate lipid classes with saturated iso branched fatty acids. FAME analysis revealed iso-15:0 (52.29 %) and iso-17:0 (18.64 %) as major fatty acyl chains. We did not observe major difference in polar head group composition of lipid classes between thermophiles (GWE1 and 7L) compare to psychrophiles (I1P). Major difference among these three strains was in fatty acid composition of lipid molecule. Both thermophiles showed presence of lipids with long chain saturated fatty acids while I1P showed presence of lipid molecule with unsaturated fatty acid chain. Lipids made of unsaturated fatty acids have lower melting points and they introduce kink in the cell membrane structure. At lower temperatures, these effects allow membrane to maintain fluidity and its functionality, which in turn allows the microorganism to grow at lower temperature. Lipids made with saturated iso branched fatty acid chain have higher melting points and they pack together densely in cell membrane. At high temperature because of higher melting point and dense packing, membrane fluidity is not affected and this effect allows microorganism to grow at the higher temperature. We believe that change in fatty acid composition is one of the many reasons for these microorganisms to survive the extreme condition. Thermostability of the other macromolecules (DNA, enzyme) of these extremophiles is not studied in this dissertation.
Temple University--Theses
Li, Jian. "Using cadmium-113 NMR spectrometry to study metal complexation by natural organic matter." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/25720.
Повний текст джерелаPetry, David P. "Silicalite Clear Sol Precursors Studied by NMR, Mass Spectrometry and Dynamic Light Scattering." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525295.
Повний текст джерелаKindahl, Lill. "Structural studies of saccharides and glycopeptides in aqueous solution by ¹H NMR spectroscopy /." Uppsala : Dept. of Chemistry, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a377.pdf.
Повний текст джерелаChen, Ling. "Improvements in excitation selectivity and spectral precision in Fourier transform NMR and mass spectrometry /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487330761219982.
Повний текст джерелаPuschmann, Robert. "Analysis and Quantification of Inositol Poly- and Pyrophosphates by NMR Spectroscopy and Mass Spectrometry." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21044.
Повний текст джерелаInositol pyrophosphates (PP-InsPs) are a well conserved group of second messengers that are involved in a plethora of cellular processes including phosphate homeostasis, insulin signaling, and apoptosis. Despite much effort, it is still mostly unknown how PP-InsPs exert their diverse functions. In order to decipher the mechanisms, researchers have relied either on metabolic labeling with radioactive inositol or on electrophoretic separation on polyacrylamide gels but these methods either lack ease of use or sensitivity. Therefore, two new analytical tools, based on nuclear magnetic resonance (NMR) spectroscopy, and liquid chromatography coupled mass spectrometry (LCMS), were developed. To overcome the limited sensitivity provided by NMR spectroscopy, a high yielding synthesis of NMR-active 13C-labeled inositol was designed and optimized. Furthermore, a chemoenzymatic synthesis of all mammalian PP-InsPs isomers was developed that relied on a scalable purification strategy utilizing precipitation with Mg2+ ions. Human cells were metabolically labeled with 13C-inositol and the prepared PP-InsPs were used as standards to identify peaks in the NMRspectra. These fingerprint signals enabled the quantification of the corresponding molecules. The LCMS-based method was based on the derivatization of the highly charged inositol pyrophosphates to their corresponding methyl esters by trimethylsilyldiazomethane. The permethylated InsPs and PP-InsPs were suitable for LC separation and MS measurement, and provide a sensitivity unmatched by NMR spectroscopy. The method was established using inositol hexakisphosphate, a simpler analog of PP-InsPs, and methylated InsP6 could be detected at quantities as low as 10 femtomole. However, the adaptation of the derivatization for PP-InsPs proved challenging as the reaction caused degradation of the analyte but strategies to circumvent the decay by changing the derivatization agent to diazomethane were promising.
Brodbeck, Roland. "Balloon-borne far-infrared Fabry-Perot spectrometer for astrophysical observations /." [S.l.] : [s.n.], 1997. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12510.
Повний текст джерелаBajwa, Tejbir Singh. "Development of a software tool to perform qualitative analysis on spectral data obtained from a NIR-MOEMS spectrometer." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1464416.
Повний текст джерелаBanerjee, Utsab. "Development of Novel High-Frequency EPR Spectrometer and In-house fabrication of NMR MAS drive caps and ultra-centrifuge kit packing tools." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS585.pdf.
Повний текст джерелаNuclear magnetic resonance (NMR) spectroscopy is a powerful method that can give insights into chemical processes and has the capability to characterize a wide variety of molecules. The simplicity of the preparation, absence of damage to the analyte, and moderate sample volumes needed are among the important reasons which make NMR a widely used spectroscopy method. However, it also has some drawbacks, such as low sensitivity. There are several methods to improve the sensitivity of NMR. One of the most powerful ways to improve the NMR sensitivity is dynamic nuclear polarization (DNP). Therefore, to accurately evaluate the DNP parameters, and characterize the spin dynamic properties of samples containing the same concentration and solvent and subjected to the same microwave irradiation power, cryogenic temperature, and magnetic field, a dual detection capability of NMR and EPR is required. In order to easily and cost effectively build an EPR/NMR probe, longitudinal detected EPR technique is used here. Longitudinal detection (LOD) of EPR is based on a pickup coil aligned parallel to the static magnetic field, , to measure a changing longitudinal magnetization. The detection coil is placed orthogonal to the transmit coil and tuned to a different frequency range, which reduces the transmit crosstalk and noise. The longitudinal magnetization can be modulated by an amplitude modulation of microwave to periodically saturate the electron magnetization. The resulting time-dependent longitudinal magnetization then induces an alternating voltage in the EPR coil with an axis parallel to . Here in this thesis we have also showed that LOD EPR can be used optical chopper. This is important because this will enable us to use the optical chopper with high power microwave sources like the gyrotron where microwave amplitude modulation is not possible. The other topic mentioned here is 3D printed caps for solid state NMR and ultracentrifuge kits to pack samples in solid state NMR rotors.The 3D-printing technology has emerged as a well-developed method to produce parts with considerably low cost and yet with high precision (<100 micron). Recent literature has shown that the 3D-printing technology can be exploited to fabricate a magic-angle spinning (MAS) system in solid-state nuclear magnetic resonance (NMR) spectroscopy. Here, we show that not only lab-affordable benchtop 3D printers can produce 3.2 mm drive caps with a similar quality as the commercialized version, but also smaller 2.5 mm and 1.3 mm MAS drive caps—despite a slight compromise in performance. All in-house fabricated drive caps (1.3 to 7 mm) can be consistently reproduced (>90 %) and achieve excellent spinning performances. In summary, the > 3.2 mm systems have similar performances as the commercial systems, while the 2.5- and 1.3-mm caps can spin up to 26 kHz ± 2 Hz, and 46 kHz ± 1 Hz, respectively. The low-cost and fast in-house fabrication of MAS drive caps allows easy prototyping of new MAS drive cap models and, possibly, new NMR applications
Dag, Semiha. "Structural studies of some bacterial lipopolysaccharides and extracellular polysaccharides using NMR spectroscopy and mass spectrometry /." Uppsala : Dept. of Chemistry, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200545.pdf.
Повний текст джерелаMoletta, Mattia <1994>. "Organic Synthesis and Characterization (NMR, mass spectrometry) of Beta-Glucosyl-Cholesterol for Parkinson's Disease research." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/18008.
Повний текст джерелаZoppi, Ugo. "Isobar suppression in accelerator mass spectrometry /." [S.l.] : [s.n.], 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10373.
Повний текст джерелаPiecuch, Scott. "A Fast NIR Spectrometer for Examining Explosive Events: Emission of PETN Based Explosives and H₂O Absorption Method Feasibility." [Milwaukee, Wis.] : e-Publications@Marquette, 2009. http://epublications.marquette.edu/theses_open/13.
Повний текст джерелаSrivastava, Abhishek. "Metabolism and bioactivation of nevirapine in humans and rats : Integrated application of NMR and mass spectrometry." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526804.
Повний текст джерелаSanh, Alan Dominique. "Peptide-RNA recognition : investigation of non-covalent interactions using ESI-mass spectrometry and proton NMR spectroscopy." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/352.
Повний текст джерелаTolonen, A. (Ari). "Analysis of secondary metabolites in plant and cell culture tissue of Hypericum perforatum L and Rhodiola rosea L." Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514271610.
Повний текст джерелаSamino, Gené Sara. "Mass spectrometry and nuclear magnetic resonance based metabolomics applied to the study of polycystic ovary syndrome." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/128209.
Повний текст джерелаObjetivos: El presente trabajo tiene dos objetivos generalizables que han sido estudiados con más detalle en la presente tesis doctoral. El primero de ellos es mejorar aspectos metodológicos en el ámbito de la metabolómica y el segundo ha sido la aplicación de la metabolómica en el estudio del síndrome del ovario poliquístico (PCOS). Resultados: Del primer objetivo se han realizado dos trabajos: en el primero, la optimización de un método de extracción común para analizar muestras biológicas en dos plataformas analíticas complementarias utilizadas en metabolómica como son la resonancia magnética nuclear y la espectrometría de masas. Del segundo trabajo realizado se han obtenido unas pautas para abordar los retos que surgen del análisis de datos de metabolómica en espectrometría de masas. Del segundo objetivo también han sido realizados dos trabajos: en ambos se ha utilizado la metabolómica no dirigida para abordar el estudio del PCOS. En el primer trabajo, se ha utilizado la metabolómica para conocer el impacto que ejerce la obesidad en los trastornos metabólicos asociados al PCOS. En el segundo trabajo, se ha utilizado la metabolómica no dirigida para evaluar como afecta la aplicación de una politerapia con medicamentos al metabolismo de pacientes con PCOS. Conclusión: La metabolómica puede ser utilizada como una nueva herramienta para estudiar los trastornos metabólicos.
Gädke, Achim, Markus Rosenstihl, Christopher Schmitt, Holger Stork, and Nikolaus Nestle. "DAMARIS – a flexible and open software platform for NMR spectrometer control: DAMARIS – a flexible and open software platform for NMRspectrometer control." Diffusion fundamentals 5 (2007) 6, S. 1-9, 2007. https://ul.qucosa.de/id/qucosa%3A14270.
Повний текст джерелаRoos, Felix Franz. "Algorithms for peptide identification by tandem mass spectrometry /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16844.
Повний текст джерелаSierk, Bernd. "Solar spectrometry for determination of tropospheric water vapor /." Zürich, 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13850.
Повний текст джерелаWortmann, Arno. "Investigation of noncovalent complexes with soft ionization mass spectrometry /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17353.
Повний текст джерелаMüller, Lukas Niklaus. "Novel computational techniques for quantitative mass spectrometry based proteomics /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17802.
Повний текст джерелаPaudel, Liladhar. "High Field 1H Nuclear Magnetic Resonance (NMR) Spectroscopy Based Metabolomics and Complex Mixture Analysis by Multidimensional NMR and Liquid Chromatography-Mass Spectrometry (LC-MS)." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1343403647.
Повний текст джерелаForshed, Jenny. "Processing and analysis of NMR data : Impurity determination and metabolic profiling." Doctoral thesis, Stockholm : Dept. of analytical chemistry, Stockholm university, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-712.
Повний текст джерелаChen, Yanyi. "Dissecting Key Determinants for Calcium and Calmodulin Regulation of GAP Junction and Viral Protein." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/chemistry_diss/64.
Повний текст джерелаRigau, Roca Laura. "Identification of protein-ligand interactions by mass spectrometry and NMR, case studies: LFA-1, Bcl-xl and Bcl-2." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492546.
Повний текст джерелаAbdullah, Sewa Faraj. "Proteomics approaches to polyketide synthases interfaces by mass spectrometry and NMR spectroscopy and the application of chemometrics to metabolomics." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682232.
Повний текст джерелаGrajcar, Michal. "New concepts of ¹°Be accelerator mass spectrometry at low energies /." Zürich : ETH, 2005. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16249.
Повний текст джерелаBensimon, Maklouf. "Photodissociation d'ions par laser infrarouge dans un spectromètre de masse à transformée de Fourier /." [S.l.] : [s.n.], 1987. http://library.epfl.ch/theses/?nr=694.
Повний текст джерелаO'Kennedy, Sean James. "A kinetic and thermodynamic study of procyanidin oligomer conformation by 1H NMR and DFT." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/98054.
Повний текст джерелаMa, Cunxian. "Tentative Identification of Hydroxylated 2,2',3,5',6-pentachlorobiphenyl Metabolites in Whole Poplar Plants by a Combination of Chromatographic and Spectrometry Techniques." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/4691.
Повний текст джерелаJoubert, Valentin. "Analyse isotopique positionnelle pour les sciences forensiques : développement et utilisation de la spectrométrie RMN quantitative 13C and 15N NMR spectrometry." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4078/document.
Повний текст джерелаIn the battle against the illicit drugs market, this is drug profiling which is currently used as a tool to track drugs trafficking routes. Profiling methods can rely on synthetic impurities, residual solvents, etc. In the ANR project FRIIME, the same objective will be pursued but using the intrinsic marker of the isotopic content of the target molecules. So far, only overall isotopic content has been exploited and measured by isotope ratio mass spectrometry (irm-MS). By using innovative methods employing nuclear magnetic resonance (NMR), the study of the position-specific isotopic distribution of the targeted products is now obtained. This work was based on the optimization of a multi-pulse sequence (INEPT) enabling to improve significantly NMR 13C sensitivity in order to ensure full isotopic tracing on large molecules. This new tool will be tested on real samples of drug for which the cutting agents will be analyzed to have an isotopic profile marker of their origin. Then new information on networks will be obtained. For the first time, this knowledge will be transposed to 15N position-specific isotopic analysis by quantiative NMR as contribution for explosives analyses as 2,4,6-trinitrotoluene (TNT)
Bovet, Cédric. "Characterizing the endocrine disrupting activity of small molecules using mass spectrometry /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17873.
Повний текст джерелаDubois, Frédéric Dubois Frédéric. "Ion formation and detection in matrix-assisted laser desorption/ionization mass spectrometry /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13255.
Повний текст джерела