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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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.
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Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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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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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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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Heteronuclear Cross-Relaxation under Solid-State Dynamic Nuclear Polarization.

Diane Daube1,2, Victoria Aladin1,2, Jörg Heiliger1,2

  • 1Institute of Physical and Theoretical Chemistry and Institute of Biophysical Chemistry, Goethe University Frankfurt , Max-von-Laue-Str. 7-9, 60438 Frankfurt am Main, Germany.

Journal of the American Chemical Society
|December 10, 2016
PubMed
Summary
This summary is machine-generated.

We discovered spontaneous polarization transfer from protons (1H) to carbon (13C) using dynamic nuclear polarization (DNP) at 100 K. This method enhances 13C NMR signals, offering new applications in molecular studies.

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Area of Science:

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

Background:

  • Dynamic nuclear polarization (DNP) enhances NMR signals by transferring polarization from electron spins to nuclear spins.
  • Hyperpolarization techniques are crucial for improving NMR sensitivity, especially for low-gamma nuclei like 13C.

Purpose of the Study:

  • To investigate spontaneous polarization transfer from hyperpolarized 1H to 13C during magic-angle spinning DNP at ~100 K.
  • To elucidate the mechanism of this polarization transfer and its potential applications.

Main Methods:

  • Magic-angle spinning (MAS) dynamic nuclear polarization (DNP) at approximately 100 K.
  • Utilizing microwave irradiation and bis-nitroxide polarizing agents for hyperpolarization.
  • 1H-13C cross-relaxation within methyl groups and 13C-13C spin-diffusion for polarization spreading.

Main Results:

  • Observed spontaneous polarization transfer from 1H to 13C, resulting in inverted 13C NMR signals with enhanced amplitude.
  • Achieved an effective 13C enhancement factor of up to -15.
  • Demonstrated that Gd(III) amplifies the effect, likely through accelerated 1H relaxation.
  • Confirmed the robustness of DNP-induced cross-relaxation in proteins and amino acids.

Conclusions:

  • 1H-13C cross-relaxation, driven by methyl group reorientation dynamics, mediates spontaneous polarization transfer under DNP conditions.
  • This DNP-enhanced cross-relaxation mimics the nuclear Overhauser effect (NOE) but utilizes hyperpolarization for steady-state enhancement.
  • The findings suggest potential applications in sensitive NMR studies of biological molecules and materials.