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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

824
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.9K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.9K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

1.1K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.1K
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

1.5K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.5K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.8K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Updated: Mar 3, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

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Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids.

Edward P Saliba1, Erika L Sesti1, Faith J Scott1

  • 1Department of Chemistry, Washington University in St. Louis , St. Louis, Missouri 63130, United States.

Journal of the American Chemical Society
|April 22, 2017
PubMed
Summary
This summary is machine-generated.

Electron spin decoupling enhances Nuclear Magnetic Resonance (NMR) sensitivity by mitigating paramagnetic effects from Dynamic Nuclear Polarization (DNP) polarizing agents. This technique improves signal intensity and reduces line widths for biomolecules.

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Biophysics

Background:

  • Dynamic nuclear polarization (DNP) significantly enhances Nuclear Magnetic Resonance (NMR) sensitivity by transferring polarization from electron paramagnetic resonance (EPR).
  • Paramagnetic DNP polarizing agents can negatively impact NMR signals due to relaxation effects.

Purpose of the Study:

  • To demonstrate electron spin decoupling in conjunction with DNP and magic-angle-spinning NMR spectroscopy.
  • To investigate the effects of microwave frequency and DNP polarization time on electron decoupling performance.

Main Methods:

  • Implementing electron spin decoupling during DNP-enhanced NMR experiments.
  • Utilizing microwave frequency sweeps as a time-domain strategy for improved decoupling.
  • Applying the technique to 13C spins in biomolecules within a glassy matrix.

Main Results:

  • Electron decoupling performance is highly dependent on microwave frequency and DNP polarization time.
  • Microwave frequency sweeps significantly improve electron decoupling effectiveness.
  • Observed an 11% reduction in line width (47 Hz) and a 14% increase in intensity for 13C spins.

Conclusions:

  • Electron spin decoupling is an effective method to mitigate paramagnetic relaxation effects in DNP-enhanced NMR.
  • The developed time-domain strategy offers a significant improvement in decoupling efficiency.
  • This technique enhances spectral quality for biomolecular NMR studies.