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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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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
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.4K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.4K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

1.1K
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...
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: 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

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Updated: Feb 25, 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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Pushing NMR sensitivity limits using dynamic nuclear polarization with closed-loop cryogenic helium sample spinning.

E Bouleau1,2, P Saint-Bonnet1,2, F Mentink-Vigier1,2

  • 1Univ. Grenoble Alpes , INAC , F-38000 Grenoble , France .

Chemical Science
|August 1, 2017
PubMed
Summary
This summary is machine-generated.

We developed a new method using dynamic nuclear polarization (DNP) with cryogenic helium for magic angle spinning (MAS) NMR. This significantly boosts sensitivity, saving experimental time and enabling new material characterizations.

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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Area of Science:

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

Background:

  • Solid-state NMR sensitivity is limited, hindering detailed atomic-level characterization.
  • Dynamic Nuclear Polarization (DNP) enhances NMR sensitivity but is typically performed at higher temperatures.
  • Current methods face limitations in achieving both high sensitivity and high resolution simultaneously.

Purpose of the Study:

  • To significantly enhance the sensitivity of solid-state NMR beyond current state-of-the-art.
  • To enable atomic-level characterization of materials previously inaccessible to NMR.
  • To explore the use of cryogenic helium for magic angle sample spinning (MAS) in DNP-enhanced NMR.

Main Methods:

  • Utilized dynamic nuclear polarization (DNP) with cryogenic helium gas for magic angle sample spinning (MAS).
  • Achieved sample temperatures as low as 30 K during DNP-enhanced NMR experiments.
  • Employed faster spinning frequencies, up to 25 kHz, for improved spectral resolution.

Main Results:

  • Demonstrated unprecedented DNP enhancement factors at sub-100 K temperatures.
  • Achieved up to 6 orders of magnitude in experimental time savings.
  • Successfully hyperpolarized the surface of an industrial catalyst and organic nano-assemblies (self-assembling peptides).

Conclusions:

  • Cryogenic helium-powered MAS-DNP significantly pushes the limits of NMR sensitivity and resolution.
  • This technique enables the study of challenging samples like industrial catalysts and nano-assemblies.
  • MAS-DNP with cryogenic helium transforms NMR into a more versatile and sensitive atomic-level characterization tool.