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Related Concept Videos

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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¹H NMR: Pople Notation01:09

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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Other Nuclides: 31P, 19F, 15N NMR01:16

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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Sodium NMR/MRI for anisotropic systems.

U Eliav1, G Navon1

  • 1School of Chemistry, Tel Aviv University, Ramat Aviv, Tel Aviv, Israel.

NMR in Biomedicine
|June 25, 2015
PubMed
Summary

Sodium ((23)Na) NMR and MRI techniques reveal ion dynamics in biological tissues. This review explores how multiple quantum coherences study anisotropic motion in cartilage, muscle, and the nervous system.

Keywords:
braincartilagedouble quantum filterintervertebral discoptic nervered blood cellstendontriple quantum filter

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Area of Science:

  • Biomedical NMR and MRI
  • Biophysics
  • Medical Imaging

Background:

  • Sodium ((23)Na) is vital for physiological processes.
  • Biological tissues exhibit anisotropic ion motion due to structures like fibers and membranes.
  • Sodium's high NMR sensitivity makes it suitable for biomedical research.

Purpose of the Study:

  • To review NMR techniques for studying (23)Na in anisotropic biological compartments.
  • To highlight the application of multiple quantum coherences for (23)Na NMR.
  • To cover (23)Na studies in cartilage, tendon, intervertebral discs, red blood cells, nervous system, and muscles.

Main Methods:

  • Utilizing diffusion measurements to study translational motion of sodium ions.
  • Exploiting multiple quantum coherences to study anisotropic rotational motion and quadrupolar interactions.
  • Applying various Nuclear Magnetic Resonance (NMR) techniques for (23)Na spectroscopy and Magnetic Resonance Imaging (MRI).

Main Results:

  • Anisotropic rotational motion of sodium ions leads to non-vanishing quadrupolar interactions.
  • Multiple quantum coherences are effective for studying these quadrupolar interactions.
  • NMR and MRI provide insights into (23)Na dynamics within diverse biological tissues.

Conclusions:

  • NMR and MRI, particularly using multiple quantum coherences, are powerful tools for investigating (23)Na dynamics in anisotropic biological environments.
  • Understanding sodium ion behavior is crucial for various physiological processes and disease states.
  • This review consolidates current applications of (23)Na NMR/MRI in key tissues.