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Proton-observed carbon-edited NMR spectroscopy in strongly coupled second-order spin systems

Henry, Pierre-Gilles
Marjanska, Malgorzata
Walls, Jamie D
Valette, Julien
Ugurbil, Kâmil
Published in Magnetic Resonance in Medicine. 2006, vol. 55, no. 2, p. 250-7
Abstract Proton-observed carbon-edited (POCE) NMR spectroscopy is commonly used to measure 13C labeling with higher sensitivity compared to direct 13C NMR spectroscopy, at the expense of spectral resolution. For weakly coupled first-order spin systems, the multiplet signal at a specific proton chemical shift in POCE spectra directly reflects 13C enrichment of the carbon attached to this proton. The present study demonstrates that this is not necessarily the case for strongly coupled second-order spin systems. In such cases NMR signals can be detected in the POCE spectra even at chemical shifts corresponding to protons bound to 12C. This effect is demonstrated theoretically with density matrix calculations and simulations, and experimentally with measured POCE spectra of [3-13C]glutamate.
Keywords Carbon IsotopesComputer SimulationGlutamic Acid/chemistryMagnetic Resonance Spectroscopy/methodsProtonsSensitivity and Specificity
PMID: 16402370
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Research group CIBM (863)
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HENRY, Pierre-Gilles et al. Proton-observed carbon-edited NMR spectroscopy in strongly coupled second-order spin systems. In: Magnetic Resonance in Medicine, 2006, vol. 55, n° 2, p. 250-7. doi: 10.1002/mrm.20764 https://archive-ouverte.unige.ch/unige:32915

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Deposited on : 2014-01-08

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