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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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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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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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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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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Full Correlations across Broad NMR Spectra by Two-Field Total Correlation Spectroscopy.

Pavel Kadeřávek1,2, Léonard Strouk1,2, Samuel F Cousin1,2,3

  • 1Département de Chimie, Laboratoire des Biomolécules (LBM), École Normale Supérieure-, PSL Research University, UPMC Univ Paris 06, CNRS, 24 rue Lhomond, 75005, Paris, France.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|May 10, 2017
PubMed
Summary
This summary is machine-generated.

A new two-field Total Correlation Spectroscopy (TOCSY) method improves nuclear magnetic resonance (NMR) assignments for complex molecules. This technique overcomes high magnetic field limitations, enabling complete carbon-13 correlations for proteins.

Keywords:
NMR spectroscopyamino acidstotal correlation spectroscopytwo-field NMRtwo-field TOCSY

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Area of Science:

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

Background:

  • Total Correlation Spectroscopy (TOCSY) is crucial for assigning NMR spectra of complex molecules.
  • Carbon-13 TOCSY is vital for protein side-chain signal assignment.
  • High magnetic fields limit current Carbon-13 TOCSY due to broad frequency ranges.

Purpose of the Study:

  • To introduce a novel two-field NMR spectroscopy concept to overcome limitations in TOCSY experiments.
  • To enhance the assignment of protein side chains using Carbon-13 TOCSY at high magnetic fields.

Main Methods:

  • Developed and implemented a two-field TOCSY experiment.
  • Utilized high magnetic fields for chemical shift labeling.
  • Performed isotropic mixing at a significantly lower magnetic field to reduce spectral width.

Main Results:

  • Achieved complete correlations between all Carbon-13 nuclei in amino acids (aromatic, aliphatic, carboxylic).
  • Demonstrated a robust approach for molecular assignment.
  • Successfully addressed the limitations of traditional TOCSY at high fields.

Conclusions:

  • The two-field TOCSY approach is a robust and generalizable method for NMR spectral assignment.
  • This technique is effective for uniformly Carbon-13 labeled molecules in high-field and ultra-high field NMR (beyond 1000 MHz).
  • Offers a significant advancement for structural determination of complex biomolecules.