Strongly coupled zero-quantum spectra

Chandrakumar, N.; Chandrasekaran, F.

doi:10.1016/0022-2364(92)90355-b

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…determined by Govindaraju et al [23]. While strong coupling effects [24] were quantitatively simulated, aspartate essentially acts as a weakly-coupled spin-system at 500 MHz.…”

Section: In Vitro Experiments and Simulationsmentioning

confidence: 99%

High resolution NMR spectroscopy of rat brain in vivo through indirect zero-quantum-coherence detection

Graaf

Rothman

Behar

2007

Journal of Magnetic Resonance

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The time evolution of zero-quantum-coherences (ZQCs) is insensitive to magnetic field inhomogeneity. Using a 2D indirect ZQC detection method it is shown that high-resolution (1)H NMR spectra can be obtained from rat brain in vivo at 11.74T that are immune to magnetic field inhomogeneity. Simulations based on the density matrix formalism, as well as in vitro measurements are used to demonstrate the features of 2D ZQC NMR spectra. Unique spectral information which is normally not directly available from regular (1)H NMR spectra can be extracted and used for compound identification or improved prior knowledge during spectral fitting.

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“…determined by Govindaraju et al [23]. While strong coupling effects [24] were quantitatively simulated, aspartate essentially acts as a weakly-coupled spin-system at 500 MHz.…”

Section: In Vitro Experiments and Simulationsmentioning

confidence: 99%

High resolution NMR spectroscopy of rat brain in vivo through indirect zero-quantum-coherence detection

Graaf

Rothman

Behar

2007

Journal of Magnetic Resonance

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“…For the AX 3 spin system of C4 we see two main lines at J and 2J as expected. 63 Since polarization transfer is occurring not at zero field, but at a small residual field lines in the J-spectra have an additional structure, e.g., see the line at 2J for C4, as expected from the analysis of different coupling regimes. 34 All other spectra are more complex multiline spectra because both C2 and C3 carbons are coupled to four protons and because these couplings are smaller; hence, the effect of the residual field is more pronounced for them.…”

Section: B Polarization Transfermentioning

confidence: 63%

Field-cycling NMR experiments in an ultra-wide magnetic field range: relaxation and coherent polarization transfer

Zhukov

Kiryutin

Yurkovskaya

et al. 2018

Phys. Chem. Chem. Phys.

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An experimental method is described allowing fast field-cycling Nuclear Magnetic Resonance (NMR) experiments over a wide range of magnetic fields from 5 nT to 10 T. The method makes use of a hybrid technique: the high field range is covered by positioning the sample in the inhomogeneous stray field of the NMR spectrometer magnet. For fields below 2 mT a magnetic shield is mounted on top of the spectrometer; inside the shield the magnetic field is controlled by a specially designed coil system. This combination allows us to measure T1-relaxation times and nuclear Overhauser effect parameters over the full range in a routine way. For coupled proton-carbon spin systems relaxation with a common T1 is found at low fields, where the spins are "strongly coupled". In some cases, experiments at ultralow fields provide access to heteronuclear long-lived spin states. Efficient coherent polarization transfer is seen for proton-carbon spin systems at ultralow fields as follows from the observation of quantum oscillations in the polarization evolution. Applications to analysis and the manipulation of heteronuclear spin systems are discussed.

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Single Voxel Localized Proton NMR Spectroscopy of Human Brain In Vivo

Frahm

Hänicke

1996

eMagRes

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Strongly coupled zero-quantum spectra

Cited by 5 publications

References 11 publications

High resolution NMR spectroscopy of rat brain in vivo through indirect zero-quantum-coherence detection

High resolution NMR spectroscopy of rat brain in vivo through indirect zero-quantum-coherence detection

Field-cycling NMR experiments in an ultra-wide magnetic field range: relaxation and coherent polarization transfer

Single Voxel Localized Proton NMR Spectroscopy of Human Brain In Vivo

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