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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

779
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...
779
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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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: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

921
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
921

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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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NMR Reaction Monitoring Robust to Spectral Distortions.

Barbara Domżał1, Magdalena Grochowska-Tatarczak2, Przemysław Malinowski2

  • 1Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Banacha 2, Warsaw 02-097, Poland.

Analytical Chemistry
|July 16, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method using Wasserstein distance for analyzing distorted Nuclear Magnetic Resonance (NMR) spectra from chemical reactions. The open-source software enables accurate quantification of reaction components even with poor spectral quality.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Chemical Kinetics

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is vital for molecular structure determination and reaction monitoring.
  • Standard NMR analysis faces challenges with distorted spectra due to sample inhomogeneity and fast reactions.
  • Non-deuterated solvents prevent magnetic field stabilization, further degrading spectral quality.

Purpose of the Study:

  • To develop a novel approach for quantitative analysis of distorted NMR spectra.
  • To overcome limitations of standard software in analyzing low-quality NMR data.
  • To provide an accessible tool for reaction monitoring under challenging conditions.

Main Methods:

  • Utilized Wasserstein distance for spectral analysis.
  • Developed an open-source software tool for quantitative component analysis.
  • Applied the method to a series of time-indexed NMR spectra.

Main Results:

  • Successfully quantified reaction mixture components from distorted spectra.
  • Demonstrated effective analysis without the need for traditional peak-picking.
  • The method is robust against spectral distortions like inhomogeneous line shapes and varying peak positions.

Conclusions:

  • The proposed Wasserstein distance-based method offers a new paradigm for quantitative NMR analysis.
  • The open-source software provides a user-friendly solution for analyzing challenging NMR datasets.
  • This approach enhances the utility of NMR spectroscopy for monitoring complex chemical reactions.