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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Published on: February 23, 2016

Resolution and polarization distribution in cryogenic DNP/MAS experiments.

Alexander B Barnes1, Björn Corzilius, Melody L Mak-Jurkauskas

  • 1Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Physical Chemistry Chemical Physics : PCCP
|May 11, 2010
PubMed
Summary
This summary is machine-generated.

High-resolution dynamic nuclear polarization/magic angle spinning (DNP/MAS) experiments maintain spectral resolution at cryogenic temperatures. Polarization is uniformly dispersed, avoiding paramagnetic broadening and enabling faster data acquisition for enhanced protein and peptide analysis.

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Published on: September 1, 2020

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysical Chemistry
  • Materials Science

Background:

  • Dynamic Nuclear Polarization (DNP) significantly enhances NMR signal sensitivity.
  • Magic Angle Spinning (MAS) is crucial for achieving high spectral resolution in solid-state NMR.
  • Concerns exist regarding spectral resolution and paramagnetic broadening in DNP/MAS experiments, particularly at cryogenic temperatures.

Purpose of the Study:

  • To address common misconceptions about high-resolution DNP/MAS experiments.
  • To demonstrate that DNP/MAS can achieve high spectral resolution without compromising sensitivity.
  • To clarify the distribution of polarization and its impact on spectral quality.

Main Methods:

  • High-resolution DNP/MAS experiments were performed on a membrane protein and a crystalline peptide.
  • Spectra were acquired at cryogenic temperatures (e.g., 85 K) and a modest magnetic field (9 T).
  • Analysis focused on spectral linewidths, paramagnetic broadening, and polarization distribution.

Main Results:

  • High spectral resolution (1 ppm linewidths for membrane proteins, <0.4 ppm for peptides) was achieved at cryogenic temperatures.
  • Exogenous radical polarizing agents did not cause paramagnetic broadening, preserving spectral resolution.
  • Enhanced polarization was uniformly distributed throughout the sample, including membrane proteins.
  • Rapid spin diffusion enabled shorter repetition times for signal averaging.

Conclusions:

  • High-resolution DNP/MAS is feasible and overcomes previous limitations.
  • Cryogenic temperatures and DNP do not inherently compromise spectral resolution.
  • Effective polarization distribution and rapid spin diffusion allow for efficient data acquisition.