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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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A Simple Algorithm to Suppress Diagonal Peaks in High-Resolution Homonuclear Chemical Shift Correlation NMR Spectra.

Shengyu Zhang1,2, Jhinuk Saha3,4,5, Yuchen Li1

  • 1Laboratory of Spin Magnetic Resonance, School of Physical Sciences, Anhui Province Key Laboratory of Scientific Instrument Development and Application, University of Science and Technology of China, Hefei 23006, China.

Biorxiv : the Preprint Server for Biology
|August 20, 2025
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Summary

This study introduces a spectral shearing technique to effectively suppress diagonal peaks in nuclear magnetic resonance (NMR) homonuclear correlation spectra. This method preserves cross-peak sensitivity, enhancing data analysis for biomolecules like alpha-synuclein and aquaporin Z.

Keywords:
Data processingDiagonal peak suppressionSolid-state MAS NMRSpin-echohomonuclear chemical shift correlation spectra

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Diagonal peaks in NMR homonuclear correlation spectra can obscure important cross-peak information.
  • Previous methods for diagonal peak suppression often led to a loss of sensitivity in crucial cross peaks.

Purpose of the Study:

  • To develop a novel spectral shearing approach for effective diagonal peak suppression in NMR.
  • To maintain or enhance the sensitivity of cross peaks during diagonal peak removal.

Main Methods:

  • A spectral shearing technique was employed to transform diagonal peaks into a zero-frequency line.
  • A data processing algorithm based on quadrature-detected spin-echo diagonal peak suppression was utilized.
  • The method was validated on uniformly 13C and 15N labeled alpha-synuclein amyloid fibrils and aquaporin Z.

Main Results:

  • The spectral shearing approach successfully transformed diagonal peaks, enabling their substantial suppression.
  • Cross-peak intensities and sensitivity were fully preserved, as the shearing only rearranged peak positions.
  • Effective diagonal peak reduction was demonstrated on complex biological samples.

Conclusions:

  • The spectral shearing method offers a significant improvement for analyzing NMR homonuclear correlation spectra.
  • This technique provides a sensitive and effective way to remove diagonal peaks without compromising spectral quality.
  • The approach is broadly applicable to various biological macromolecules studied by NMR spectroscopy.