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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

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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...
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Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

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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...
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Other Nuclides: 31P, 19F, 15N NMR01:16

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Dynamic nuclear polarization for sensitivity enhancement in modern solid-state NMR.

Aany Sofia Lilly Thankamony1, Johannes J Wittmann1, Monu Kaushik1

  • 1Institute of Physical and Theoretical Chemistry, Institute of Biophysical Chemistry, and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max-von-Laue-Str. 7-9, 60438 Frankfurt, Germany.

Progress in Nuclear Magnetic Resonance Spectroscopy
|November 22, 2017
PubMed
Summary

Dynamic nuclear polarization (DNP) significantly enhances Nuclear Magnetic Resonance (NMR) spectroscopy. This review details DNP mechanisms, instrumentation, and applications in structural biology and materials science.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Dynamic Nuclear Polarization (DNP)

Background:

  • DNP has evolved significantly over six decades.
  • DNP-enhanced MAS NMR spectroscopy is a powerful technique.

Purpose of the Study:

  • To provide an in-depth review of DNP-enhanced MAS NMR spectroscopy.
  • To cover theoretical DNP mechanisms, polarization transfer, instrumentation, polarizing agents, and optimization techniques.
  • To present applications in structural biology and materials science.

Main Methods:

  • Theoretical description of DNP mechanisms.
  • Analysis of polarization transfer pathways.
  • Review of historical and state-of-the-art instrumentation.
  • Discussion of polarizing agents and optimization strategies.

Main Results:

  • DNP mechanisms and polarization transfer pathways are detailed.
  • Current instrumentation, polarizing agents, and optimization techniques are covered.
  • MAS DNP is a vital research tool, beyond proof-of-concept.

Conclusions:

  • MAS DNP is a mature and indispensable technique.
  • It has broad applications in structural biology and materials science.
  • The review highlights the advancements and utility of MAS DNP.