Relevant bibliographies by topics / Lc-Ms/ms | 13c rmn

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  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Lc-Ms/ms | 13c rmn'

Author: Grafiati
Published: 7 July 2024
Last updated: 31 July 2025

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Journal articles on the topic "Lc-Ms/ms | 13c rmn"

1

Zhang, Kai. "Comparison of Flow Injection-MS/MS and LC-MS/MS for the Determination of Ochratoxin A." Toxins 13, no. 8 (2021): 547. http://dx.doi.org/10.3390/toxins13080547.

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Two methods for measuring ochratoxin A in corn, oat, and grape juice were developed and compared. Flow injection (FI) and on-line liquid chromatography (LC) performances were evaluated separately, with both methods using a triple quadrupole tandem mass spectrometer (MS/MS) for quantitation. Samples were fortified with 13C uniformly labeled ochratoxin A as the internal standard (13C-IS) and prepared by dilution and filtration, followed by FI- and LC-MS/MS analysis. For the LC-MS/MS method, which had a 10 min run time/sample, recoveries of ochratoxin A fortified at 1, 5, 20, and 100 ppb in corn,
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Trilleras, Jorge, Karen Feria, Daniel Alcazar, Jairo Quiroga, Manuel Nogueras, and Justo Cobo. "Síntesis multicomponente y caracterización de derivados pirimido [4,5-b] quinolínicos con evaluación de la actividad antileishmania." Revista Colombiana de Ciencias Químico-Farmacéuticas 46, no. 1 (2017): 5–17. http://dx.doi.org/10.15446/rcciquifa.v46n1.67286.

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A partir de 6-amino-3-metil-2-(metiltio)pirimidin-4(3H)-ona, aldehídos aromáticos y benzoquinona, por medio de una reacción de ciclodeshidratación de Michael asistida por radiación de microondas, se realizó la síntesis y caracterización de la serie de derivados tricomponentes pirimido[4,5-b]quinolínicos, y se evaluó la posible actividad antileishmania. Los nuevos compuestos se caracterizaron por análisis espectroscópico de IR, RMN 1H, RMN 13C y MS.
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Ford, Roddey E., Mark J. Magera, Karen M. Kloke, Paul A. Chezick, Abdul Fauq, and Joseph P. McConnell. "Quantitative Measurement of Porphobilinogen in Urine by Stable-Isotope Dilution Liquid Chromatography-Tandem Mass Spectrometry." Clinical Chemistry 47, no. 9 (2001): 1627–32. http://dx.doi.org/10.1093/clinchem/47.9.1627.

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Abstract Background: Measurement of porphobilinogen (PBG) is useful in the diagnosis of the acute neurologic porphyrias. Currently used colorimetric assays lack analytical and clinical sensitivity and specificity. Methods: We developed a liquid chromatography-electrospray tandem mass spectrometry (LC-MS/MS) method for the measurement of PBG in 1 mL of urine, using 5-(aminoethyl)-4-(carboxymethyl) 1H-2,4-[13C]pyrolle-3-propanoic acid ([2,4-13C]PBG; 2.75 μg) as internal standard. After solid-phase extraction, LC-MS/MS analysis was performed in the selected-reaction monitoring (SRM) mode. PBG and
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Cocuron, Jean-Christophe, Zacchary Ross, and Ana P. Alonso. "Liquid Chromatography Tandem Mass Spectrometry Quantification of 13C-Labeling in Sugars." Metabolites 10, no. 1 (2020): 30. http://dx.doi.org/10.3390/metabo10010030.

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Subcellular compartmentation has been challenging in plant 13C-metabolic flux analysis. Indeed, plant cells are highly compartmented: they contain vacuoles and plastids in addition to the regular organelles found in other eukaryotes. The distinction of reactions between compartments is possible when metabolites are synthesized in a particular compartment or by a unique pathway. Sucrose is an example of such a metabolite: it is specifically produced in the cytosol from glucose 6-phosphate (G6P) and fructose 6-phosphate (F6P). Therefore, determining the 13C-labeling in the fructosyl and glucosyl
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Zhang, Kai, Chia-Ding Liao, Shristi Prakash, Michael Conway, and Hwei-Fang Cheng. "Interlaboratory Validation of a Stable Isotope Dilution and Liquid Chromatography Tandem Mass Spectrometry Method for the Determination of Aflatoxins in Milk, Milk-Based Infant Formula, and Feed." Journal of AOAC INTERNATIONAL 101, no. 3 (2018): 677–85. http://dx.doi.org/10.5740/jaoacint.17-0341.

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Abstract An interlaboratory study was conducted to evaluate stable isotope dilution and LC tandem MS (MS/MS) for the determination of aflatoxins B1, B2, G1, G2, and M1 (AFB1, AFB2, AFG1, AFG2, and AFM1) in milk, milk-based infant formula (formula), and feed. Samples were first fortified with five 13C uniformly labeled aflatoxins {[13C]–internal standard (IS)} corresponding to the five native aflatoxins, which were subsequently extracted with acetonitrile–water (50 + 50, v/v), followed by centrifugation, filtration, and LC-MS/MS analysis. In addition to certified milk powder and animal feed, th
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Moriyasu, Takako, Keiko Minowa, Miho Sakamoto, et al. "Differentiation Between Sulfoaildenafil and Its Analogs." Journal of AOAC INTERNATIONAL 94, no. 6 (2011): 1770–77. http://dx.doi.org/10.5740/jaoacint.10-425.

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Abstract An analog of aildenafil, which is a potent and highly selective inhibitor of phosphodiesterase 5, was found in a dietary supplement marketed for enhancement of sexual function. The compound was isolated by silica gel column chromatography, and its structure was identified by means of 13C-NMR spectrometry, 1H-NMR spectrometry, high-resolution MS, and X-ray structure determination. The compound was identified to be sulfoaildenafil (other names: thioaildenafil, dimethyl sildenafil thione, and thiomethisosildenafil). Sulfoaildenafil is very similar to the compound thiohomosildenafil. As i
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7

Trivedi, Dahryn, Mahendra Kumar Trivedi, Alice Branton, and Snehasis Jana. "LC-MS and GC-MS Spectrometry Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Pyridoxine Using LC-MS and GC-MS Spectrometry." Advances in Nanomedicine and Nanotechnology Research 2, no. 3 (2021): 198–205. https://doi.org/10.5281/zenodo.10361257.

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Pyridoxine (vitamin B6) is commonly found in foods and dietary supplements, has an important role in physiologic development. In this study, the influence of the Trivedi Effect®-Biofield Energy Healing Treatment on the structural properties and the isotopic abundance ratio of vitamin B6 were evaluated using LC-MS and GC-MS. Vitamin B6 sample was divided into two parts and termed as control and treated samples. Only the treated vitamin B6 was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Dahryn Trivedi. The LC-MS spectra of
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Trivedi, Dahryn, Mahendra Kumar Trivedi, Alice Branton, and Snehasis Jana. "LC-MS and GC-MS Spectrometry Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Pyridoxine Using LC-MS and GC-MS Spectrometry." Advances in Nanomedicine and Nanotechnology Research 2, no. 3 (2021): 198–205. https://doi.org/10.5281/zenodo.10361261.

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Pyridoxine (vitamin B6) is commonly found in foods and dietary supplements, has an important role in physiologic development. In this study, the influence of the Trivedi Effect®-Biofield Energy Healing Treatment on the structural properties and the isotopic abundance ratio of vitamin B6 were evaluated using LC-MS and GC-MS. Vitamin B6 sample was divided into two parts and termed as control and treated samples. Only the treated vitamin B6 was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Dahryn Trivedi. The LC-MS spectra of
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Trivedi, Dahryn, Mahendra Kumar Trivedi, Alice Branton, and Snehasis Jana. "LC-MS and GC-MS Spectrometry Based Isotopic Abundance Ratio Analysis of the Consciousness Energy Healing Treated Pyridoxine Using LC-MS and GC-MS Spectrometry." Advances in Nanomedicine and Nanotechnology Research 2, no. 3 (2021): 198–205. https://doi.org/10.5281/zenodo.10361259.

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Pyridoxine (vitamin B6) is commonly found in foods and dietary supplements, has an important role in physiologic development. In this study, the influence of the Trivedi Effect®-Biofield Energy Healing Treatment on the structural properties and the isotopic abundance ratio of vitamin B6 were evaluated using LC-MS and GC-MS. Vitamin B6 sample was divided into two parts and termed as control and treated samples. Only the treated vitamin B6 was received the Trivedi Effect®-Consciousness Energy Healing Treatment remotely by a well-known Biofield Energy Healer, Dahryn Trivedi. The LC-MS spectra of
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10

Grocholska, Paulina, and Remigiusz Bąchor. "Trends in the Hydrogen−Deuterium Exchange at the Carbon Centers. Preparation of Internal Standards for Quantitative Analysis by LC-MS." Molecules 26, no. 10 (2021): 2989. http://dx.doi.org/10.3390/molecules26102989.

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The application of internal standards in quantitative and qualitative bioanalysis is a commonly used procedure. They are usually isotopically labeled analogs of the analyte, used in quantitative LC-MS analysis. Usually, 2H, 13C, 15N and 18O isotopes are used. The synthesis of deuterated isotopologues is relatively inexpensive, however, due to the isotopic effect of deuterium and the lack of isotopologue co-elution, usually they are not considered as good internal standards for LC-MS quantification. On the other hand, the preparation of 13C, 15N and 18O containing standards of drugs and their m
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Dissertations / Theses on the topic "Lc-Ms/ms | 13c rmn"

1

Gauthier, Lea. "Approche métabolomique pour la compréhension des mécanismes de résistance à Fusarium graminearum et accumulation de trichothécènes chez le maïs." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0235.

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Parmi les nombreux pathogènes fongiques susceptibles d’infecter les épis de maïs, les espèces appartenant au genre Fusarium sont particulièrement préoccupantes pour la filière maïsicole. La fusariose est susceptible d’induire des pertes de rendement considérables et est fréquemment associée à une contamination des épis par des mycotoxines. Un des leviers prometteur repose sur la sélection génétique de plantes résistantes à Fusarium et à l’accumulation de mycotoxines. Plusieurs Quantitative Trait Loci (QTL) ont été identifiés d’après la caractérisation moléculaire de la résistance à la fusarios
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2

Bonneau, Natacha. "Acétogénines d’Annonaceae et parkinsonismes atypiques : de la biodisponibilité de l’annonacine à l’exposition alimentaire." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS271/document.

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Une importante proportion de formes atypiques de parkinsonismes a été rapportée en Guadeloupe en 1999. Il ressort des études épidémiologiques menées sur place, que tous les patients atteints étaient de grands consommateurs de produits alimentaires et médicinaux de la famille des Annonaceae, et plus particulièrement du genre Annona. De nombreux genres appartenant à cette famille renferment des molécules fortement cytotoxiques : les acétogénines d’Annonaceae. Leur présence dans les fruits d’Annona muricata a déjà été mise en évidence. Cependant, peu de données existent sur leur teneur en acétogé
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Romminger, Stelamar. "Avaliação do potencial metabólico de linhagens de fungos isolados de uma espécie de alga marinha do gênero Sargassum." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-21082009-110418/.

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Os fungos são microrganismos amplamente dispersos, podendo ser encontrados em vegetais, animais, solo e ambientes aquáticos, participando do ciclo de elementos na natureza. Embora muitos papéis ecológicos tenham sido estudados e descritos para os fungos terrestres, a ecologia de fungos marinhos ainda é pouco conhecida. Assim, os oceanos, que representam aproximadamente metade da biodiversidade global, são uma fonte enorme e virtualmente inexplorada de microrganismos produtores de novos produtos naturais. O objetivo deste trabalho foi isolar linhagens de fungos derivados de uma espécie de alga
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4

Marchal, Axel. "Recherches sur les bases moléculaires de la saveur sucrée des vins secs : approches analytique et sensorielle." Thesis, Bordeaux 2, 2010. http://www.theses.fr/2010BOR21779/document.

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La saveur sucrée est à l’origine de l’équilibre gustatif des vins secs. On observe uneaugmentation de son intensité au cours de la macération post-fermentaire et de l’élevage enbarrique. Nous montrons que ces phénomènes sont respectivement liés à la libération depeptides de la levure et de composés non-volatils du bois de chêne dans les vins.Le rôle de la protéine Hsp12 de S. cerevisae sur le gain de sucrosité est établi enutilisant des techniques de biologie moléculaire et d’analyse sensorielle.Le développement d’un couplage chromatographie de partage centrifuge –gustatométrie permet de fract
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Cardoso, Josiane de Oliveira. "Identificação estrutural de metabólitos provenientes do metabolismo in vitro de compostos bioativos e estudos de fenotipagem enzimática." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7718.

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Submitted by Regina Correa (rehecorrea@gmail.com) on 2016-10-03T13:08:11Z No. of bitstreams: 1 TeseJOC.pdf: 3485823 bytes, checksum: 6f1dbfbe709a908e9ec5667584683225 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-10T14:07:31Z (GMT) No. of bitstreams: 1 TeseJOC.pdf: 3485823 bytes, checksum: 6f1dbfbe709a908e9ec5667584683225 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-10T14:07:39Z (GMT) No. of bitstreams: 1 TeseJOC.pdf: 3485823 bytes, checksum: 6f1dbfbe709a908e9ec5667584683225 (MD5)<br>Made available in
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Nohra, Youssef A. "Résines végétales actuelles et fossiles : origine, caractérisation chimique et évolution." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S165.

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Les travaux de cette thèse portent sur la caractérisation chimique des ambres provenant de plusieurs gisements d’âges et d’origines géographiques variés, dont certains sont inédits. Des protocoles identiques à tous les échantillons et combinant les analyses spectroscopiques (IR et RMN 13C) et chromatographiques (THM-CPG-SM) ont été appliqués, permettant d’identifier l’origine botanique des ambres et fournissant des indices pour la reconstitution des paléoenvironnements terrestres. La caractérisation chimique des gisements d’ambre du Jurassique supérieur (Kimméridgien) jusqu’au Crétacé supérieu
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Prieri, Marion. "Reprogrammation de la bioactivation de prodrogues antituberculeuses : conception, synthèse et évaluation biologique de molécules bioactivables selon différents mécanismes oxydatifs et de composés potentialisant l’activité de nitro-imidazolés." Thesis, Lille, 2018. http://www.theses.fr/2018LILUS056.

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Depuis deux décennies, l’humanité est confrontée à une augmentation spectaculaire du nombre de bactéries résistantes et multirésistantes aux antibiotiques, mettant en péril l’arsenal thérapeutique au complet. La tuberculose est particulièrement concernée par l’apparition de souches multirésistantes aux antibiotiques, obligeant très souvent les médecins à prolonger de plusieurs mois la prise en charge des patients et à jongler avec différents antibiotiques en cours de traitement, ce qui retarde d’autant plus la guérison. En outre, si les souches pan-résistantes restent, pour le moment, exceptio
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Traboulsi, Ali. "Radiolyse gamma et lixiviation post irradiation de résines échangeuses d'Ions." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4301/document.

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La connaissance du comportement sous irradiation γ et en présence d'eau des Résines Echangeuses d'Ions est nécessaire pour prévoir leur impact sur l'environnement pendant la phase d'entreposage et dans un éventuel stockage en profondeur géologique. Les REI étudiées sont la résine MB400 en lit mélangé ainsi que ses composants anionique et cationique « purs ». La stratégie expérimentale suivie a été basée sur l'utilisation d'outils chimiométriques qui ont permis d'étudier l'effet du milieu d'irradiation, du débit de dose, de la dose et de la température de lixiviation. Les produits de radiolyse
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Cordonnier, Julien. "Toxoplasma gondii : identification par docking inverse sur des cibles moléculaires de composés actifs issus de ressources naturelles." Electronic Thesis or Diss., Reims, 2024. http://www.theses.fr/2024REIMS001.

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Les écorces d’arbres, co-produit de la sylviculture, constituent une source abondante et durable de substances naturelles. Toxoplasma gondii est le parasite responsable de la toxoplasmose, présentant une menace chez les fœtus, les nouveau-nés et les personnes immunodéprimées. Les thérapies actuelles, limitées et mal tolérées, font désormais face à des phénomènes de chimiorésistance. Ce travail de thèse a pour but d’explorer l’espace chimique associé aux écorces d’essences champardennaises, et les cibles protéiques essentielles à T. gondii. Une première évaluation in silico par docking inverse
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Gabaston, Julien. "Stilbènes de la vigne et d’essences forestières (pin, épicéa) : Etude phytochimique et recherche d’activités anti-oomycète et insecticide." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0302/document.

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De nos jours, il y a une volonté générale de se tourner vers une agriculture plus respectueuse de l’environnement et du consommateur se traduisant notamment par une démarche de réduction des intrants chimiques. Dans un contexte de développement durable, la recherche de produits naturels pour lutter contre les maladies et les ravageurs suscite un regain d’intérêt. Dans cette thèse, des extraits hydro-alcooliques issus de coproduits de la vigne (sarment, cep, racine) et d’essences forestières (écorce d'épicéa, nœud de pin) se sont révélés être une excellente source de polyphénols bioactifs, en p
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Book chapters on the topic "Lc-Ms/ms | 13c rmn"

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Thiele, Björn, and Shizue Matsubara. "Carotenoid Isotopolog Profiling in 13C-Labeled Leaf Extracts by LC-MS and LC-FTICR-MS." In Methods in Molecular Biology. Springer US, 2019. http://dx.doi.org/10.1007/978-1-4939-9952-1_20.

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Conference papers on the topic "Lc-Ms/ms | 13c rmn"

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Von Gerichten, Johanna, Annette Holland, Barbara Fielding, Elizabeth Miles та Graham Burdge. "α-Linolenic acid metabolism in human CD3+ T cells favours oxylipin production over polyunsaturated fatty acid synthesis". У 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/asgv6871.

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The essential dietary fatty acid α-linolenic acid (ALA) can be converted into anti-inflammatory 18 carbon oxylipins or into longer chain n€‘3 polyunsaturated fatty acids (PUFAs) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The partitioning of ALA between these alternative metabolic fates is not understood. To address this, peripheral blood CD3+ T cells from healthy volunteers (18-30 years; n=10) were cultured for 48h, with or without concanavalin A (10µg/ml) in 10% (v/v) pooled donor plasma with low ALA (20 µM) or high ALA (40 µM) concentrations (1:10 [13C]€‘labelled/unl
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Hussein, Ola, Feras Alali, Ala-Eddin Al Moustafa, and Ashraf Khalil. "Design, Synthesis and Biological Evaluation of Novel Chalcone Analogs as Potential Therapeutic Agents for Castration-Resistant Prostate Cancer." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0179.

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Prostate cancer (PCa) is the second most frequently diagnosed malignancy, as well as a leading cause of cancer-related mortality in men globally. Despite the initial response to hormonal targeted therapy, the majority of patients ultimately progress to a lethal form of the disease, termed as castration-resistant prostate cancer (CRPC), which currently lacks curative therapeutic options and is associated with poor prognosis. Therefore, the development of novel treatment modalities for PCa is urgently needed. Chalcones, also known as 1,3-diphenyl-2-propen-1-ones, are among the highly attractive
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