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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.
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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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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.8K
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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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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Singlet-filtered NMR spectroscopy.

Salvatore Mamone1,2, Nasrollah Rezaei-Ghaleh3,4, Felipe Opazo2,5

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|March 5, 2020
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Summary
This summary is machine-generated.

Nuclear magnetic resonance (NMR) advances signal selection in tissues using nuclear spin singlet states. This method filters signals from Alzheimer's-related peptides and brain metabolites, enabling new diagnostic and research avenues.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Molecular Biology
  • Neuroscience
  • Metabolomics

Background:

  • Nuclear spin singlet states offer selective signal detection in complex biological samples.
  • Existing methods for singlet state preparation can be limited in scope and application.
  • Understanding molecular structures and disease biomarkers in tissues requires advanced analytical techniques.

Purpose of the Study:

  • To develop a generalized and versatile pulsed NMR experiment for broad singlet state population.
  • To demonstrate the utility of this method for filtering signals from specific biomolecules in tissue.
  • To explore novel long-lived states in metabolites within biological tissues.

Main Methods:

  • Development of a novel pulsed NMR experiment for populating nuclear spin singlet states.
  • Application of the experiment to filter signals from proton pairs in Alzheimer's disease-related beta-amyloid 40 peptide.
  • Analysis of metabolites in brain tissue, focusing on glutamine/glutamate.

Main Results:

  • Successful filtering of signals from proton pairs in beta-amyloid 40 peptide and brain metabolites.
  • Discovery of a long-lived singlet state in glutamine/glutamate within tissue, without radiofrequency irradiation.
  • Demonstration of a versatile approach for signal selection in complex biological systems.

Conclusions:

  • The developed NMR technique provides a powerful tool for selective signal detection in biological tissues.
  • The findings open new possibilities for studying metabolites, particularly in the context of neurological diseases.
  • This approach holds promise for future in vivo applications in diagnostics and molecular research.