Relevant bibliographies by topics / 1H NMR quantification

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic '1H NMR quantification'

Author: Grafiati
Published: 29 March 2023
Last updated: 31 July 2025

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Journal articles on the topic "1H NMR quantification"

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Li, Yue-Chiun, Chia-Hung Wu, Thi Ha Le, et al. "A Modified 1H-NMR Quantification Method of Ephedrine Alkaloids in Ephedrae Herba Samples." International Journal of Molecular Sciences 24, no. 14 (2023): 11272. http://dx.doi.org/10.3390/ijms241411272.

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A previous 1H-NMR method allowed the quantification of ephedrine alkaloids; however, there were some disadvantages. The cyclized derivatives resulted from the impurities of diethyl ether were identified and benzene was selected as the better extraction solvent. The locations of ephedrine alkaloids were confirmed with 2D NMR. Therefore, a specific 1H-NMR method has been modified for the quantification of ephedrine alkaloids. Accordingly, twenty Ephedrae Herba samples could be classified into three classes: (I) E. sinica-like species; (II) E. intermedia-like species; (III) others (lower alkaloid
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Wang, Roy Chih Chung, David A. Campbell, James R. Green, and Miroslava Čuperlović-Culf. "Automatic 1D 1H NMR Metabolite Quantification for Bioreactor Monitoring." Metabolites 11, no. 3 (2021): 157. http://dx.doi.org/10.3390/metabo11030157.

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High-throughput metabolomics can be used to optimize cell growth for enhanced production or for monitoring cell health in bioreactors. It has applications in cell and gene therapies, vaccines, biologics, and bioprocessing. NMR metabolomics is a method that allows for fast and reliable experimentation, requires only minimal sample preparation, and can be set up to take online measurements of cell media for bioreactor monitoring. This type of application requires a fully automated metabolite quantification method that can be linked with high-throughput measurements. In this review, we discuss th
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Shumilina, Elena, Christian Andreasen, Zahra Bitarafan, and Alexander Dikiy. "Determination of Glyphosate in Dried Wheat by 1H-NMR Spectroscopy." Molecules 25, no. 7 (2020): 1546. http://dx.doi.org/10.3390/molecules25071546.

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A wheat field was sprayed with a dosage of 1.1 kg a.i./ha Roundup PowerMax 10 days before harvest. The 1H Nuclear Magnetic Resonance (NMR) spectroscopy was used for the detection and quantification of the glyphosate (GLYP) in dried wheat spikelets, leaves, and stems. The quantification was done by the integration of the CH2-P groups doublet at 3.00 ppm with good linearity. The GLYP content varied between different samples and parts of the plant. On average, the largest content of herbicide was found in leaves (20.0 mg/kg), followed by stems (6.4 mg/kg) and spikelets (6.3 mg/kg). Our study show
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de Graaf, Robin A., Hetty Prinsen, Cosimo Giannini, Sonia Caprio, and Raimund I. Herzog. "Quantification of 1H NMR spectra from human plasma." Metabolomics 11, no. 6 (2015): 1702–7. http://dx.doi.org/10.1007/s11306-015-0828-1.

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Merkx, Donny W. H., Yvonne Westphal, Ewoud J. J. van Velzen, Kavish V. Thakoer, Niels de Roo, and John P. M. van Duynhoven. "Quantification of food polysaccharide mixtures by 1H NMR." Carbohydrate Polymers 179 (January 2018): 379–85. http://dx.doi.org/10.1016/j.carbpol.2017.09.074.

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Sorte, Eric G., Jessica M. Rimsza, and Todd M. Alam. "Computational and Experimental 1H-NMR Study of Hydrated Mg-Based Minerals." Molecules 25, no. 4 (2020): 933. http://dx.doi.org/10.3390/molecules25040933.

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Magnesium oxide (MgO) can convert to different magnesium-containing compounds depending on exposure and environmental conditions. Many MgO-based phases contain hydrated species allowing 1H-nuclear magnetic resonance (NMR) spectroscopy to be used in the characterization and quantification of proton-containing phases; however, surprisingly limited examples have been reported. Here, 1H-magic angle spinning (MAS) NMR spectra of select Mg-based minerals are presented and assigned. These experimental results are combined with computational NMR density functional theory (DFT) periodic calculations to
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Kuz’mina, Natalia E., Sergey V. Moiseev, Elena Y. Severinova, Evgenii A. Stepanov, and Natalia D. Bunyatyan. "Identification and Quantification by NMR Spectroscopy of the 22R and 22S Epimers in Budesonide Pharmaceutical Forms." Molecules 27, no. 7 (2022): 2262. http://dx.doi.org/10.3390/molecules27072262.

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The authors developed four variants of the qNMR technique (1H or 13C nucleus, DMSO-d6 or CDCl3 solvent) for identification and quantification by NMR of 22R and 22S epimers in budesonide active pharmaceutical ingredient and budesonide drugs (sprays, capsules, tablets). The choice of the qNMR technique version depends on the drug excipients. The correlation of 1H and 13C spectra signals to molecules of different budesonide epimers was carried out on the basis of a comprehensive analysis of experimental spectral NMR data (1H-1H gCOSY, 1H-13C gHSQC, 1H-13C gHMBC, 1H-1H ROESY). This technique makes
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Balayssac, Stéphane, Gaëtan Assemat, Saïda Danoun, Myriam Malet-Martino, and Véronique Gilard. "Quantitative 1H and 13C NMR and Chemometric Assessment of 13C NMR Data: Application to Anabolic Steroid Formulations." Molecules 30, no. 9 (2025): 2060. https://doi.org/10.3390/molecules30092060.

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This study investigates the potential of 1H and 13C NMR for the characterization and classification of anabolic androgenic steroids (AASs) in various formulations. First, twenty AAS formulations, including tablets, capsules, and injectable solutions, were analyzed using 1H NMR for the qualitative identification and quantification of active compounds. The results revealed discrepancies between the labeled and detected substances in several samples, highlighting issues related to product mislabeling and potential health risks. Then, twelve oil-based injectable formulations were examined using 13
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D’eon, Jessica C., Brian P. Lankadurai, André J. Simpson, et al. "Cross-Platform Comparison of Amino Acid Metabolic Profiling in Three Model Organisms Used in Environmental Metabolomics." Metabolites 13, no. 3 (2023): 402. http://dx.doi.org/10.3390/metabo13030402.

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Environmental metabolomics is a promising approach to study pollutant impacts to target organisms in both terrestrial and aquatic environments. To this end, both nuclear magnetic resonance (NMR)- and mass spectrometry (MS)-based methods are used to profile amino acids in different environmental metabolomic studies. However, these two methods have not been compared directly which is an important consideration for broader comparisons in the environmental metabolomics field. We compared the quantification of 18 amino acids in the tissue extracts of Daphnia magna, a common model organism used in b
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Koptyug, Igor V., Quentin Stern, Sami Jannin, and Stuart J. Elliott. "Frozen water NMR lineshape analysis enables absolute polarization quantification." Physical Chemistry Chemical Physics 24, no. 10 (2022): 5956–64. http://dx.doi.org/10.1039/d1cp05127j.

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Echo-detected 1H NMR spectra of water molecules hyperpolarized by dissolution-dynamic nuclear polarization alleviates deleterious dead time induced lineshape distortions and enables accurate nuclear spin polarization quantification.
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Dissertations / Theses on the topic "1H NMR quantification"

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Lehnström, Angelica. "Using 19F-NMR and 1H-NMR for Analysis of Glucocorticosteroids in Creams and Ointments : -Method Development for Screening, Quantification and Discrimination." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40843.

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Topical treatment containing undeclared corticosteroids and illegal topical treatment with corticosteroid content have been seen on the Swedish market. In creams and ointments corticosteroids in the category of glucocorticosteroids are used to reduce inflammatory reactions and itchiness in the skin. If the inflammation is due to bacterial infection or fungus, complementary treatment is necessary. Side effects of corticosteroids are skin reactions and if used in excess suppression of the adrenal gland function. Therefore the Swedish Medical Products Agency has published related warnings to make
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Bellomo, Giovanni. "MR spectroscopy in human prostate: in vitro and in vivo measurements to optimize new quantification algorithms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9259/.

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Il cancro della prostata (PCa) è il tumore maligno non-cutaneo più diffuso tra gli uomini ed è il secondo tumore che miete più vittime nei paesi occidentali. La necessità di nuove tecniche non invasive per la diagnosi precoce del PCa è aumentata negli anni. 1H-MRS (proton magnetic resonance spectroscopy) e 1H-MRSI (proton magnetic resonance spectroscopy imaging) sono tecniche avanzate di spettroscopia in risonanza magnetica che permettono di individuare presenza di metaboliti come citrato, colina, creatina e in alcuni casi poliammine in uno o più voxel nel tessuto prostatico. L’abbondanza o l’
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Rosset, Isac George. "Produção de biodiesel empregando biocatálise via reações de esterificação e transesterificação." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-19052011-110440/.

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Neste trabalho prepararam-se ésteres de ácidos graxos por esterificação do ácido oléico e transesterificação do óleo de soja e do triéster oléico via catálise enzimática. Determinou-se a composição dos produtos obtidos por RMN 1H e CG-FID. Os padrões dos ésteres do ácido oléico via esterificação ácida foram preparados empregando ácido sulfúrico, os padrões dos ésteres do óleo de soja por transesterificação básica com hidróxido de sódio e o padrão do triéster oléico foi sintetizado utilizando ácido p-tolueno sulfônico como catalisador. A melhor enzima para essas reações foi determinada através
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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.

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L’objectif de ce travail de thèse était de déterminer la composition chimique d’extraits de plantes de Corse encore peu ou pas étudiées et susceptibles d’avoir des activités biologiques valorisables. Cette étude a été menée en mettant en œuvre la méthodologie d’analyse des mélanges complexes par RMN 13C, développée depuis une trentaine d’années par l’équipe « Chimie et Biomasse » de l’UMR CNRS 6134 Sciences pour l’Environnement de l’université de Corse. Dans une première partie, nous avons étudié la composition chimique d’extraits de houx commun (Ilex aquifolium L.). Deux extraits de feuilles
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Book chapters on the topic "1H NMR quantification"

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Pulkkinen, Juhani, Mika Lappalainen, Anna-Maija Häkkinen, Nina Lundbom, Risto A. Kauppinen, and Yrjö Hiltunen. "Quantification of Human Brain Metabolites from In Vivo 1H NMR Magnitude Spectra Using Self-Organising Maps." In Intelligent Data Engineering and Automated Learning. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45080-1_71.

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Smith, Ashley M., and Jill E. Millstone. "Ligand Exchange and 1H NMR Quantification of Single- and Mixed-Moiety Thiolated Ligand Shells on Gold Nanoparticles." In Methods in Molecular Biology. Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6840-4_2.

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C. Percival, Benita, Angela Wann, Sophie Taylor, Mark Edgar, Miles Gibson, and Martin Grootveld. "Metabolomics Distinction of Cigarette Smokers from Non-Smokers Using Non-Stationary Benchtop Nuclear Magnetic Resonance (NMR) Analysis of Human Saliva." In Oral Health Care [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101414.

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Implementations of high-field nuclear magnetic resonance (NMR) facilities into metabolomics studies are unfortunately restricted by their large dimensions, high costings, and specialist technical staff requirements. Therefore, here the application and practical advantages offered by low-field (60 MHz), compact NMR spectrometers for probing the metabolic profiles of human saliva was explored, as was their value in salivary metabolomics studies. Saliva samples were collected from cigarette smoking (n = 11) and non-smoking (n = 31) human participants. 1H NMR spectra were acquired on both low-fiel
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Leenheer, Jerry A. "Characterization of Natural Organic Matter by Nuclear Magnetic Resonance Spectroscopy." In Nuclear Magnetic Resonance Spectroscopy in Environment Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097511.003.0019.

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Natural organic matter (NOM) is a major intermediate in the global carbon, nitrogen, sulfur, and phosphorus cycles. NOM is also the environmental matrix that frequently controls binding, transport, degradation, and toxicity of many organic and inorganic contaminants. Despite its importance, NOM is poorly understood at the structural chemistry level because of its molecular complexity and heterogeniety. Nuclear magnetic resonance (NMR) spectroscopy is one of the most useful spectrometric methods used to investigate NOM structure because qualitative and quantitative organic structure information
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Conference papers on the topic "1H NMR quantification"

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Park, Chan. "Quantification of Free Alcohol Content in Industrial Alcohol Ethoxylates by 1h NMR." In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists’ Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.466.

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Rosset, Isac G., and André L. M. Porto. "Transesterification and Quantification by 1H NMR of Triester Oleate by Candida antarctica Lipase." In 14th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0004-1.

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Hennebelle, Marie, Dharma Kodali, Jianli Wang, and John Van Duynhoven. "Quantitative assessment of epoxide formation in bulk oil and mayonnaise by 1H-13C HSQC NMR spectroscopy." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/ndzl9672.

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Lipid oxidation is a chemical process that is detrimental for the quality of oil-based foods. Historically, hydroperoxides and aldehydes are considered the most important molecules in the assessment of lipid oxidation. While they do provide insights in kinetics of primary and secondary oxidation, it has been proposed that a third class of oxidation products, the epoxides, could help resolve mechanistical anomalies that are hitherto unexplained.Here, we developed a 2D 1H-13C HSQC NMR method that allows for a quantitative assessment of epoxides in real food products. The method was applicable in
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