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Статті в журналах з теми "Quantification par RMN 1H"
Petiaud, Roger, and Quang Tho Pham. "Polychloroprene. I. Etude de la microstructure par RMN 1H." Journal of Polymer Science: Polymer Chemistry Edition 23, no. 5 (May 1985): 1333–42. http://dx.doi.org/10.1002/pol.1985.170230507.
Повний текст джерелаBonnet, A., G. Barre, and P. Gilard. "« Trinoyaux ». Détermination des structures par RMN 1H, 13C et 15N." Journal de Chimie Physique 92 (1995): 1823–28. http://dx.doi.org/10.1051/jcp/1995921823.
Повний текст джерелаSmadja, William. "Mesure de la racemisation d'α-phenylcetones acycliques par RMN 1H et 2H". Tetrahedron Letters 29, № 11 (січень 1988): 1283–86. http://dx.doi.org/10.1016/s0040-4039(00)80277-4.
Повний текст джерелаHamamah, S., F. Seguin, C. Barthélémy, A. Fignon, S. Akoba, A. Lepape, J. Lansac, and D. Royère. "Exploration du plasma seminal humain: Nouvelle approche par la resonance magnetique nucleaire du proton (RMN-1H)." Andrologie 2, no. 1 (October 1992): 10–11. http://dx.doi.org/10.1007/bf03034585.
Повний текст джерелаMerniz, Salah, Louiza Himed, Mahieddine Mokhtari та Abdelhamid Mousser. "Marquage du 2-aminothiazole avec une unité cyclohexadiène fer tricabonyle. Étude structurale et activité antibactérienne du complexe marqué (1-4-η-5-N-2-aminothiazoliocyclohexa-1,3-diène) fer tricarbonyle". Canadian Journal of Chemistry 97, № 10 (жовтень 2019): 704–10. http://dx.doi.org/10.1139/cjc-2019-0016.
Повний текст джерелаSarazin, C., G. Goethals, JP Seguin, MD Legoy, and JN Barbotin. "Étude par spectroscopie RMN 1H et 13C de la synthèse d’esters en milieu organique catalysée par une lipase : influence de l’eau." Journal de Chimie Physique 89 (1992): 541–47. http://dx.doi.org/10.1051/jcp/1992890541.
Повний текст джерелаGarnier, Janine, and Jacqueline Mahuteau. "Difforlemenine, alcaloide nouveau de vinca difformis pourr., determination de structure par RMN du 1H à 400 MHz." Tetrahedron Letters 26, no. 12 (1985): 1513–14. http://dx.doi.org/10.1016/s0040-4039(00)98539-3.
Повний текст джерелаSalah, Nessrine, Youssef Arfaoui, Mohamed Bahri, Mohamed Lotfi Efrit та Azaiez Ben Akacha. "Synthese et Etude Conformationnelle Par RMN (1H, 13C, 31P) et DFT des Cycloalcoxyphosphinallenes et des Hydrazones β-Cycloalcoxyphosphonatees". Phosphorus, Sulfur, and Silicon and the Related Elements 188, № 5 (1 травня 2013): 609–22. http://dx.doi.org/10.1080/10426507.2012.700348.
Повний текст джерелаPetiaud, Roger, and Quang Tho Pham. "Polychloroprene. II. Etude comparée de la microstrusture par RMN 1H et 13C. Thermodynamique de propagation des différentes unités structurales." Journal of Polymer Science: Polymer Chemistry Edition 23, no. 5 (May 1985): 1343–60. http://dx.doi.org/10.1002/pol.1985.170230508.
Повний текст джерелаGrenier-Loustalot, M. F., M. Audenaert, J. Boutillier, A. Gascoin, and D. Lecacheux. "Microstructure de copolyméres éthylène, méthacrylate de glycidyle et acétate de vinyle par IRTF et par RMN 13C et 1H haute résolution dans les liquides." European Polymer Journal 25, no. 3 (January 1989): 211–20. http://dx.doi.org/10.1016/0014-3057(89)90220-6.
Повний текст джерелаДисертації з теми "Quantification par RMN 1H"
Palu, Doreen. "Etude de la composition chimique d’extraits d’Ilex aquifolium Linné et de Calicotome villosa (Poiret) Link de Corse par RMN du carbone-13." Electronic Thesis or Diss., Corte, 2022. http://www.theses.fr/2022CORT0018.
Повний текст джерелаThe aim of this work was to determine chemical composition of wild growing corsican understudied plant species, with potential biological activities. This study was realized using the computerized NMR method developed over the past thirty years by the University of Corsica “Chimie et Biomasse” group, UMR CNRS “Sciences Pour l’environnement”. Identified secondary metabolites were then undertaken to evaluate their antimicrobial properties. As part of this study, we selected on the first place commun holly (Ilex aquifolium L.). After two successive column chromatography, hexane and dichloromethane leaves crude extracts and all chromatography fractions were analyzed by 13C NMR (GC(RI) and GC-MS sometimes) to allow the identification of eleven triterpens and α- and β-amyrin esters. Among identified compounds, ursolic acid and oleanolic acid were also quantified by 1H NMR in the dichloromethane crude extract using a reliable method developped and validated (accuracy, linearity precision of measurements). Ursolic acid accounted for 55.3% of the extract, followed by oleanolic acid, 20.8%. Evaluation of previous identified compounds antimicrobial activities has been performed in collaboration with « Biochimie et Biologie Moléculaire du Végétal » group (University of Corsica). Triterpen acids and chloramphenicol (reference antibiotic) displayed similar antibacterial activities against three Gram-positive bacteria, Staphylococcus aureus, Staphylococcus epidermidis and Bacillus cereus (MIC = 4 and 8 mg.L-1 vs. 2 and 4 mg.L-1). Moreover, dichloromethane and dichloromethane/ethyl acetate (50/50, v/v) berries extracts were submitted to successive column chromatography. Crude extracts and chromatography fractions 13C NMR spectra revealed presence of nine triterpens previously identidied, five phenolics derivatives, six monosaccharides and four lactones (menisdaurilide, aquilegiolide, dasycarponilide and 7-epi-griffonilide) were first time identified in berries holly extracts. On the second place, we determined chemical compositions of Calicotome villosa (Poir.) Link flowers and root extracts. 13C NMR analysis of dichloromethane and ethyl acetate flowers extracts and their chromatography fractions, allowed the identification of three flavonoids, five glycosyl flavonoids and four phenylpropanoids. We also studied chemical composition of a methanol root extract which has never been submitted to any chemical composition study. After successive column chromatography, eighteen compounds were identified by 13C NMR including sterols, flavonoids, a polyphenol and pterocarpans
Cuny, Marion. "Authenticite des produits agroalimentaires par spectroscopie rmn 1h et outils chimiometriques." Phd thesis, AgroParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00003745.
Повний текст джерелаCuny, Marion. "Authenticité des produits agroalimentaires par spectroscopie RMN 1H et outils chimiométriques." Paris, AgroParisTech, 2008. http://www.theses.fr/2008AGPT0017.
Повний текст джерела1H NMR spectroscopy is widely used as an analytical method in different sectors. Its number of applications in the area of food and beverage authenticity is growing. However, the multivariate analysis of the type of data obtained from an NMR spectrum is still not as developed as in Near Infrared spectroscopy. In this work, different chemometric methods have been applied to 1H NMR data in order to assess the potential of the combined techniques to authenticate food and beverages. First, we have demonstrated that Independent Component Analysis (ICA) was better adapted to the analysis of a 1H NMR spectrum than the commonly used Principal Component Analysis (PCA). Indeed, by its very nature, ICA aims at recovering pure sources from mixed signals. Applied to the spectra, it was shown that it is possible to extract certain component signals, such as the naringin signal from the spectra of a mixture of orange and grapefruit juices. Different pre-treatments were then tested. Data warping has been found to be useful when the data shows variation in chemical shifts. In addition, as the data also varied considerably in intensity along the spectrum, a logarithmic transformation was performed to produce unbiased results when using other chemometric tools such as PCA and ICA. Finally, different approaches were investigated to select variables in the spectrum. The first approach was based on criteria related to the variables themselves, such as the total variance and covariance in the Clustering of Variables (CLV) function. The second type of method involved the selection of contiguous variables to take into account the relation between variables in a signal. Interval_PLS (iPLS) was used as a reference to compare other more recently developed methods: Evolving Windows Zone Selection and Interval-PLS_Cluster. The variable selection techniques used were to highlight known authenticity markers of orange and grapefruit juices: flavonoids hesperidin and naringin that are measured in the standard HPLC method IFU 58. In the case of the balsamic vinegar dataset, the selected zones contained the signal of compounds linked to the product's aging process that differentiate traditional balsamic vinegar from its cheaper, more commonly used counterpart. In the example based on different types of yoghurts, the variable selection procedures focused on 6 certain aroma compounds and solvents used as flavour carriers. These were used to differentiate the type of yoghurts: flavoured, with fruit, with pulp and at different concentrations. Through these different applications, this study has shown the importance of using appropriate tools for spectral analysis tools that take into account the specificity of 1H NMR spectroscopy compared to other spectroscopic methods: variation in intensities along the spectrum, the size of the dataset, and redundant information
Gasmi, Geneviève. "Developpement de nouvelles sequences d'impulsions en rmn : etude du nosiheptide (antibiotique cyclopeptidique) par rmn 1h, 13c, 15n." Reims, 1993. http://www.theses.fr/1993REIMP204.
Повний текст джерелаGougeon, Louis. "Application de la métabolomique par spectroscopie RMN 1H à l'authentification des vins." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0052/document.
Повний текст джерелаIn a globalized market where 40% of the wine consumed is imported, traceability control is a major challenge for the wine industry. Wine authentication is the process that can use different analytical methods able to control three fundamental parameters: geographical origin, grape variety and vintage. Quantitative 1H NMR spectroscopy (qNMR) is now considered as a very promising tool for studying wine authenticity. During this thesis, a technique was developed for the determination of 40 major wine compounds by 1H NMR. It allows the acquisition of rich and complex information in a single non-specific analysis. The ability of this technique to authenticate a wine has been demonstrated following a collaboration with Château Mouton-Rothschild, by comparison with official analyses carried out by the DGDDI and DGCCRF of Pessac (SCL).The determination of a compliance threshold has been established by taking into account the natural evolution of bottled wines. A characterization study of Bordeaux red wines was carried out. The singularity of these wines was observed in comparison with other French wines, highlighting the characteristic metabolites of Bordeaux wines. The results provide a global description of the potential of 1H NMR for wine authentication
Bailac, Laura. "Composés organiques fluorés : Étude par RMN multinoyaux {1H, 13C, 19F} et calculs DFT." Rouen, 2016. http://www.theses.fr/2016ROUES008.
Повний текст джерелаFor more than 40 years, fluorinated compounds have become increasingly important in the field of pharmaceutical, food chemistry and polymers. The knowledge of the 3D structure of those compounds can be of great importance especially in the case of molecule interaction studies. NMR is the most powerful method for the structural characterization of synthetic and natural compounds. Moreover, fluorine 19 owns remarkable magnetic properties which make it an interesting probe for the structural characterization of fluorinated organic compounds by NMR. During this project, a thorough structural study of fluorinated compounds by NMR and DFT has been realized. Recent NMR experiments, using selective pulses and encoding gradient such as the 1D Pure Shift and 2D G-SERF experiments, helped extract very accurate spectroscopic data such as chemical shifts and homo- and heteronuclear scalar coupling constants. Those spectroscopic data have been then completed by structural data such as internuclear distances and dihedral angles obtained by DFT geometry optimization of those compounds. In the second part of this work, the data obtained by NMR were used to develop a DFT computational model using a benchmark to predict, from the 3D structure, the heteronuclear coupling constants nJHF. This model also allows to determine the different contributions composing the scalar coupling. The access to each contribution's weight for a given coupling allows a better understanding of the mechanism of coupling's transmission, in particular in the case of long distance scalar couplings
COMBOURIEU, BRUNO. "Etude par rmn 1h in situ de la degradation d'heterocycles azotes de type morpholine par des mycobacteries." Clermont-Ferrand 2, 1999. http://www.theses.fr/1999CLF22111.
Повний текст джерелаLEVY, PIERRE-JEAN. "Caracterisation des catalyseurs rhodium-zeolithes par thermoreactions programmees, rmn-#1h et rmn6#1#2#9xe." Paris 6, 1989. http://www.theses.fr/1989PA066312.
Повний текст джерелаDECAGNY, BENOIT. "Etude par spectroscopie rmn #1h et #1#3c d'une reaction d'esterification catalysee par une lipase : role particulier de l'eau." Amiens, 1998. http://www.theses.fr/1998AMIE0104.
Повний текст джерелаLecachey, Baptiste. "Etudes structurales d’agrégats mixtes organolithiés par RMN multinoyaux 1H, 6Li, 13C. : Applications en additions nucléophiles énantiosélectives." Rouen, 2009. http://www.theses.fr/2009ROUES012.
Повний текст джерелаThree NMR studies of characterization of mixed aggregates in solution were conducted during this work. Complex MeLi / LiCl: The so-called “low halide” solutions of methyllithium, contain 2 to 5% molar of lithium chloride. This salt exerts a strong influence on many enantioselective processes; it was thus essential to determine how it interacts with MeLi in THF at low temperature. The single formation of trimer [(MeLi)(LiCl)2], in equilibrium with MeLi and LiCl tetramers in THF, is evidenced. This aggregation contrasts with the cubic tetramers known for MeLi / LiBr and MeLi / LiI. Complex LiCl / o-TolCH(Me)OLi: In the enantioselective condensation of MeLi on the o-tolualdehyde in the presence of a chiral lithium amide derived from a 3-aminopyrrolidine (3AP-Li), the lithium alkoxide (Al-Li) formed impounds the ligand, and thus limits the induction. The addition of lithium chloride together with the aldehyde on the complex 3AP-Li / MeLi allowed to trap the alkoxide forming a cubic aggregate incorporating one LiCl and three Al-Li. This procedure give access to a version of the 1,2 addition in which substoichiometric amount of chiral ligand (33% mol) can be used. Complexes 3AP-Li / lithium enolate: The 1,4 enantioselective nucleophilic addition of lithium enolates (En-Li) on tert-butyl crotonate in the presence of 3AP-Li led to e. E. ’s up to 76%. The complexes formed between 3AP-Li and En-Li are described here. With a 1 to 1 stoichiometry in THF, they are comparable to those formed between 3AP-Li and alkyllithium