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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Improving solvent suppression in jump-return NOESY experiments.

J Stonehouse1, G L Shaw, J Keeler

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, U.K..

Journal of Biomolecular NMR
|August 23, 2012
PubMed
Summary
This summary is machine-generated.

This study addresses challenges in nuclear Overhauser effect spectroscopy (NOESY) solvent suppression, especially at short mixing times. A novel NOESY sequence using field gradients improves water suppression across all mixing times.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysical Chemistry
  • Organic Chemistry

Background:

  • Solvent suppression is crucial for obtaining high-quality Nuclear Overhauser Effect Spectroscopy (NOESY) spectra.
  • Traditional jump-return NOESY sequences often struggle with effective water suppression, particularly at short mixing times.
  • Radiation damping of water magnetization significantly impacts suppression efficiency.

Purpose of the Study:

  • To investigate the limitations of solvent suppression in jump-return NOESY experiments.
  • To identify the factors affecting water suppression efficacy, especially concerning radiation damping.
  • To develop an improved NOESY sequence for robust water suppression.

Main Methods:

  • Analysis of radiation damping effects on water magnetization during NOESY mixing times.
  • Development and implementation of a new jump-return NOESY sequence incorporating field gradients.
  • Experimental validation of the proposed sequence across various mixing times.

Main Results:

  • Demonstrated critical dependence of water suppression on radiation damping during the NOESY mixing period.
  • The proposed jump-return NOESY sequence effectively suppresses water signals.
  • Achieved good water suppression levels for all mixing time values and NOESY increments.

Conclusions:

  • The novel jump-return NOESY sequence with field gradients overcomes limitations of previous methods.
  • This sequence provides reliable water suppression, enhancing spectral quality in NOESY experiments.
  • The findings are applicable to a wide range of NOESY experiments and mixing times.