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

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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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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...
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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¹³C NMR: ¹H–¹³C Decoupling01:04

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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.
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Enhanced sensitivity for pulse dipolar EPR spectroscopy using variable-time RIDME.

Joshua L Wort1, Katrin Ackermann1, Angeliki Giannoulis1

  • 1EaStCHEM School of Chemistry, Biomedical Sciences Research Complex and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews, Scotland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 11, 2023
PubMed
Summary
This summary is machine-generated.

Variable-time acquisition in pulse dipolar EPR spectroscopy (PDS) significantly enhances sensitivity and streamlines experiments. This method improves signal-to-noise ratios by 2- to 5-fold compared to traditional constant-time PDS methods.

Keywords:
Distance measurementsDouble histidineSensitivitySpin-label

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Area of Science:

  • Structural biology
  • Biophysics
  • Spectroscopy

Background:

  • Pulse dipolar EPR spectroscopy (PDS) is vital for studying macromolecular assemblies.
  • High sensitivity is crucial for PDS at physiological concentrations.
  • Current PDS methods are time-consuming and experimentally demanding.

Purpose of the Study:

  • To enhance sensitivity and streamline PDS measurement optimization.
  • To benchmark variable-time acquisition Relaxation Induced Dipolar Modulation Experiments (RIDME) against constant-time methods.
  • To improve PDS applicability to challenging biological systems.

Main Methods:

  • Benchmarking 5- and 6-pulse variable-time RIDME experiments.
  • Utilizing Cu(II)-nitroxide and Cu(II)-Cu(II) model systems.
  • Comparing variable-time acquisition with traditional constant-time acquisition.

Main Results:

  • Variable-time RIDME demonstrated 2- to 5-fold sensitivity improvements over constant-time analogues.
  • The variable-time approach streamlines PDS optimization to a single step.
  • Enhanced sensitivity allows for PDS measurements at lower concentrations.

Conclusions:

  • Variable-time acquisition is a superior method for PDS, offering enhanced sensitivity and efficiency.
  • This advancement facilitates more accessible and accurate structural studies of biological macromolecules.
  • Optimized PDS protocols will accelerate research in human health and disease.