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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...

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NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
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Precision and sensitivity optimization of quantitative measurements in solid state NMR.

Fabio Ziarelli1, Stéphane Viel, Stéphanie Sanchez

  • 1CNRS, Fédération des Sciences Chimiques de Marseille, Spectropole, Service 511, av Escadrille Normandie Niémen, 13397, Marseille Cedex 20, France. fabio.ziarelli@univ-cezanne.fr

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 21, 2007
PubMed
Summary

This study introduces a method to enhance quantitative solid-state NMR measurements. Optimizing sample placement and rotor packing significantly improves precision and accuracy for various materials.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Characterization
  • Analytical Chemistry

Background:

  • Quantitative solid-state NMR (ssNMR) measurements are crucial for material analysis.
  • Optimizing precision, accuracy, and sensitivity in ssNMR is essential for reliable results.
  • The external reference method is a common approach for quantitative ssNMR.

Purpose of the Study:

  • To present a methodology for optimizing quantitative solid-state NMR measurements.
  • To improve the precision, accuracy, and sensitivity of ssNMR using the external reference method.
  • To detail methods for determining the quantitative coil volume and optimizing rotor packing.

Main Methods:

  • Determining the "quantitative" coil volume using gradient or non-gradient coils.
  • Designing optimum rotor packing to match sample volume to quantitative coil volume.
  • Utilizing the ERETIC (Electronic REference Tracking and Intensity Calibration) method for instrumental instability compensation.

Main Results:

  • Achieving a one-order of magnitude increase in experimental precision for both soft (adamantane) and hard (NaCl) materials.
  • Demonstrating the importance of sample localization within the coil region for proportionality.
  • Showing that the ERETIC method can further enhance precision by compensating for instrumental instabilities.

Conclusions:

  • The presented methodology significantly enhances the precision and accuracy of quantitative ssNMR.
  • Proper sample positioning and rotor packing are critical for reliable quantitative ssNMR.
  • The ERETIC method offers further improvements in precision by addressing instrumental drift.