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Fast-MAS total through-bond correlation spectroscopy using adiabatic pulses.

Edme H Hardy1, Andreas Detken, Beat H Meier

  • 1Physical Chemistry, ETH Hoenggerberg, CH-8093 Zurich, Switzerland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 4, 2003
PubMed
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New pulse sequences for total through-bond correlation spectroscopy (TOBSY) achieve high polarization transfer efficiency, even with radiofrequency field variations. This method aids resonance assignments in complex molecules using magic-angle spinning (MAS).

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Advanced pulse sequence development for molecular structure determination.

Background:

  • Traditional through-bond correlation spectroscopy (TOBSY) methods can be sensitive to radiofrequency (RF) field imperfections.
  • Magic-angle spinning (MAS) is crucial for high-resolution solid-state NMR but requires robust pulse sequences.

Purpose of the Study:

  • To introduce novel adiabatic pulse sequences for TOBSY under MAS conditions.
  • To enhance polarization transfer efficiency and reduce sensitivity to RF field inhomogeneities.

Main Methods:

  • Development and implementation of adiabatic pulse sequences, specifically WiW9(24)(1).
  • Utilizing magic-angle spinning (MAS) at 26.67 kHz.
  • Experimental validation in a two-spin system and application to biomolecules.

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Main Results:

  • Demonstrated polarization transfer efficiency of up to 76% in a two-spin system.
  • The developed TOBSY sequences show reduced sensitivity to RF field amplitude and homogeneity above a threshold.
  • Successful application for resonance assignments in L-Val-L-Phe and antamanide.

Conclusions:

  • Adiabatic pulse sequences offer a robust approach for TOBSY in solid-state NMR.
  • These sequences improve spectral quality and facilitate resonance assignments in peptides.
  • The method is valuable for structural studies of biomolecules using MAS NMR.