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Related Concept Videos

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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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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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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 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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Hyperpolarised benchtop NMR spectroscopy for analytical applications.

Ana I Silva Terra1, Daniel A Taylor1, Meghan E Halse1

  • 1Department of Chemistry, University of York, York, YO10 5DD, UK.

Progress in Nuclear Magnetic Resonance Spectroscopy
|December 7, 2024
PubMed
Summary

Benchtop NMR spectroscopy is enhanced using hyperpolarization techniques like DNP, PHIP, and photo-CIDNP. This boosts signal sensitivity for affordable, portable NMR applications in analysis and biomolecular studies.

Keywords:
Benchtop NMRDNPPHIPPhoto-CIDNPSABRE

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Analytical Chemistry
  • Biophysical Chemistry

Background:

  • Standard NMR spectrometers (≥7T) offer high sensitivity and resolution but are expensive and non-portable.
  • Benchtop NMR spectrometers (1-2.4T) are affordable and portable but suffer from reduced sensitivity and resolution.
  • Hyperpolarization techniques can significantly amplify NMR signals, overcoming sensitivity limitations.

Purpose of the Study:

  • To review hyperpolarization methods suitable for benchtop NMR.
  • To discuss the integration of these techniques with benchtop NMR detection.
  • To explore analytical applications of hyperpolarized benchtop NMR.

Main Methods:

  • Review of dynamic nuclear polarization (DNP), parahydrogen-induced polarization (PHIP), and photochemically-induced dynamic nuclear polarization (photo-CIDNP) theories.
  • Discussion of practical integration strategies for these methods with benchtop NMR instruments.
  • Case studies showcasing applications in reaction monitoring and biomolecular interaction studies.

Main Results:

  • DNP, PHIP, and photo-CIDNP show significant promise for enhancing benchtop NMR sensitivity.
  • Successful integration examples demonstrate the feasibility of combining hyperpolarization with benchtop NMR.
  • Hyperpolarized benchtop NMR enables sensitive analysis across various applications.

Conclusions:

  • Hyperpolarization is crucial for unlocking the full potential of benchtop NMR for analytical tasks.
  • The reviewed techniques offer pathways to overcome inherent sensitivity limitations of low-field NMR.
  • Future perspectives indicate expanded applications in reaction monitoring, biomolecular studies, and beyond.