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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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...
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...
Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei in a...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

A method for C(alpha) direct-detection in protonless NMR.

Wolfgang Bermel1, Ivano Bertini, Isabella C Felli

  • 1Bruker BioSpin GmbH, Rheinstetten, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 28, 2007
PubMed
Summary
This summary is machine-generated.

This study introduces a new double S(3)E (DS(3)E) method for efficiently decoupling carbon-13 nuclei in proteins. This technique preserves nuclear coherence, enabling better C(alpha) detection in large protein molecules up to 480 kDa.

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Last Updated: Jul 12, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

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Published on: September 17, 2017

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
08:09

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale

Published on: April 19, 2021

Area of Science:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Protein structural biology
  • Advanced spectroscopic techniques

Background:

  • Efficient decoupling of carbon-13 nuclei is crucial in NMR spectroscopy for obtaining high-resolution spectra.
  • Maintaining nuclear spin coherence during decoupling is essential to avoid signal loss, especially in large biomolecules.
  • Existing spin-state selection methods may have limitations in efficiency and applicability to large proteins.

Purpose of the Study:

  • To develop and evaluate a novel method for efficient carbon-13 decoupling in NMR spectroscopy.
  • To improve the detection of C(alpha) signals in large proteins by minimizing coherence loss during decoupling.
  • To assess the performance of the new double S(3)E (DS(3)E) technique for protein NMR applications.

Main Methods:

  • Implementation of a newly developed double S(3)E (DS(3)E) pulse sequence.
  • Application of the DS(3)E method to NMR experiments on proteins.
  • Comparison of DS(3)E with existing S(3)E spin-state selection methods.
  • Evaluation of coherence preservation and C(alpha) signal intensity.

Main Results:

  • The DS(3)E method demonstrates high efficiency in decoupling carbon-13 nuclei.
  • Significant preservation of nuclear spin coherence was achieved during the decoupling process.
  • The DS(3)E technique proved particularly effective for C(alpha) detection in proteins up to 480 kDa.
  • Improved signal-to-noise ratios for C(alpha) resonances were observed compared to previous methods.

Conclusions:

  • The developed DS(3)E method offers an efficient approach for carbon-13 decoupling in NMR.
  • This technique enhances C(alpha) detection capabilities for large proteins, advancing structural studies.
  • DS(3)E represents a valuable advancement in NMR methodology for biomolecular research.