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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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.
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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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Related Experiment Video

Updated: May 9, 2026

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
09:37

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

Published on: February 12, 2019

Dynamic nuclear polarization enhanced NMR in the solid-state.

Umit Akbey1, W Trent Franks, Arne Linden

  • 1NMR Supported Structural Biology, Leibniz Institute für Molekulare Pharmakologie, Robert Roessle Str. 10, 13125, Berlin, Germany, akbey@fmp-berlin.de.

Topics in Current Chemistry
|July 9, 2013
PubMed
Summary
This summary is machine-generated.

Dynamic nuclear polarization (DNP) significantly enhances Nuclear Magnetic Resonance (NMR) spectroscopy sensitivity. This breakthrough allows for the study of biological samples at much lower concentrations, reducing experiment times from weeks to days.

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Last Updated: May 9, 2026

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
09:37

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Published on: February 12, 2019

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Area of Science:

  • Biophysical Chemistry
  • Spectroscopy
  • Structural Biology

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is vital for analyzing molecular structure and dynamics.
  • Biological NMR is limited by low sensitivity, requiring millimolar sample concentrations.
  • Techniques like fluorescence and electron paramagnetic resonance (EPR) offer higher sensitivity.

Purpose of the Study:

  • To explain Dynamic Nuclear Polarization (DNP) enhanced NMR experiments.
  • To focus on solid-state magic angle spinning (MAS) DNP.
  • To discuss DNP applications and potential improvements.

Main Methods:

  • Dynamic Nuclear Polarization (DNP) for enhanced NMR sensitivity.
  • Polarization transfer from unpaired electrons to nuclei.
  • Solid-state magic angle spinning (MAS) DNP experiments.

Main Results:

  • DNP increases NMR sensitivity by several orders of magnitude.
  • Achieves an absolute increase in signal-to-noise ratio (S/N).
  • Enables study of lower concentration biological samples.

Conclusions:

  • DNP overcomes the sensitivity limitations of traditional NMR.
  • Reduced experimental times from weeks to hours or days.
  • Opens new possibilities for studying dilute biological systems.