Results 1 to 10 of about 254,930 (339)
Interfacing Liquid State Hyperpolarization Methods with NMR Instrumentation
Journal of Magnetic Resonance Open, 2022 Advances in liquid state hyperpolarization methods have enabled new applications of high-resolution NMR spectroscopy. Utilizing strong signal enhancements from hyperpolarization allows performing NMR spectroscopy at low concentration, or with high time ...
Pierce Pham +3 more
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Unprecedented Carbon Signal Enhancement in Liquid-State NMR Spectroscopy. [PDF]
Angew Chem Int Ed Engl, 2017 We shall overcome: As a result of efforts to overcome the sensitivity challenge of liquid-state NMR spectroscopy, a thousand-fold signal enhancement was achieved by dynamic nuclear polarization (DNP) for 13 C signals at high magnetic field (3.4 T) and room temperature, thereby exceeding the predicted limitations of high-field liquid-state in situ DNP.
Pintér G, Schwalbe H.
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Liquid-State NMR Analysis of Nanocelluloses [PDF]
Biomacromolecules, 2018 Recent developments in ionic liquid electrolytes for cellulose or biomass dissolution has also allowed for high-resolution 1H and 13C NMR on very high molecular weight cellulose. This permits the development of advanced liquid-state quantitative NMR methods for characterization of unsubstituted and low degree of substitution celluloses, for example ...
Alistair W. T. King +10 more
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Convection in liquid-state NMR: expect the unexpected
RSC Advances, 2016 Temperature gradients in liquid NMR samples cause convection, attenuating signals in experiments that use field gradients. Different spectrometers and probes show surprisingly different dependences of convection velocity vmax on temperature T.
Barbosa, T. M. +4 more
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Colorants, 2023 This work provides significant insight into the molecular structure of alizarin lake pigments used by artists in the past. To characterize two red powders, lakes 1 and 2, obtained by complexation of 1,2-dihydroxy anthraquinone (alizarin) with Al3+, a ...
Leonel C. Silva +4 more
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Journal of Magnetic Resonance Open, 2022 Aimed at fundamental understanding and design of advanced magnetic resonance experiments on basis of Hamiltonians, we describe highly convergent and exact effective Hamiltonian methods which alleviate important deficits of current less accurate methods ...
Anders B. Nielsen, Niels Chr. Nielsen
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Optimizing Sensitivity-enhanced Quantitative 13C NMR Experiment by Genetic Algorithm
Chinese Journal of Magnetic Resonance, 2023 Quantitative NMR experiments are an essential part of NMR analysis, which play a critical role in component analysis and compound structure identification. Carbon atoms form the framework of organic compounds, and 13C NMR has unique advantages in organic
SONG Linhong +4 more
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NMR Data Analysis of Manidipine Hydrochloride
Chinese Journal of Magnetic Resonance, 2021 Manidipine hydrochloride is the third generation of new synthetic antihypertensive drugs. The structure of manidipine hydrochloride was confirmed with 1D and 2D nuclear magnetic resonance (NMR) techniques, such as 1H NMR, 13C NMR, DEPT-135, 1H-1H COSY ...
LI Yu-jiang +6 more
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Interactions Between n-Butanol/Propionic Acid and Humic Acid Studied by NMR Spectroscopy
Chinese Journal of Magnetic Resonance, 2021 The Fischer-Tropsch process produces liquid fuels. However, the process also yields Fischer-Tropsch wastewater, an acidic and corrosive byproduct enriched with various water-soluble oxygen-containing compounds such as alcohols, aldehydes, ketones and ...
Shu-huai ZHANG +5 more
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Sample illumination device facilitates in situ light-coupled NMR spectroscopy without fibre optics
Communications Chemistry, 2022 In situ illumination of liquid-state NMR samples allows to characterise light-dependent chemical and biological phenomena, but, in practice, the position of an NMR sample deep within the bore of a spectrometer magnet renders such illumination challenging.
Jack E. Bramham, Alexander P. Golovanov
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