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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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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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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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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.
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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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Net-phase flow NMR for compact applications.

Pedro F Silva1, Mehrdad Alinaghian Jouzdani1, Miguel Condesso1

  • 1Karlsruhe Institute of Technology (KIT), Institute of Microstructure Technology, Karlsruhe 76131, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 12, 2022
PubMed
Summary

This study introduces a new Nuclear Magnetic Resonance (NMR) method to measure fluid flow velocity using signal phase. This technique maintains high signal-to-noise ratio (SNR) for fast flows, unlike traditional methods.

Keywords:
Biplanar shimsCompact flow NMRNet-phase encodingPlanar front-endStripline

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Area of Science:

  • Physics
  • Chemistry
  • Engineering

Background:

  • Traditional flow measurement methods like magnitude-based or imaging-based Nuclear Magnetic Resonance (NMR) can suffer from signal loss, especially at high flow rates.
  • Accurate monitoring of fluid flow is crucial in various industrial processes.

Purpose of the Study:

  • To propose and implement a novel NMR-based flowmeter utilizing the net phase of the NMR signal for robust fluid flow velocity encoding.
  • To demonstrate the feasibility of this method in a low-cost, low-field (1 T) setting for industrial applications.

Main Methods:

  • Encoding fluid flow velocity into the net phase of the NMR signal, achieving local bijectivity.
  • Implementing the phase-based encoding in a custom-designed flow channel for a low-cost NMR flowmeter.
  • Operating the flowmeter in a low magnetic field (1 T) environment.

Main Results:

  • The proposed method maintains a high signal-to-noise ratio (SNR) even for fast fluid flows, overcoming limitations of existing techniques.
  • A well-engineered flow channel was found to be essential for optimal performance, unlike traditional cylindrical designs.
  • Successful implementation of a low-cost NMR flowmeter capable of measuring fluid flow velocity.

Conclusions:

  • The net phase of the NMR signal offers a robust mechanism for encoding fluid flow velocity.
  • This phase-based NMR flowmeter is suitable for low-cost, low-field applications, such as monitoring industrial reaction flows.
  • Optimized flow channel design is critical for the effectiveness of this NMR flow measurement technique.