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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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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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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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NMR Spectrometers: Resolution and Error Correction01:14

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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...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Quick, sensitive serial NMR experiments with Radon transform.

Rupashree Dass1, Paweł Kasprzak2, Krzysztof Kazimierczuk1

  • 1Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097 Warsaw, Poland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 12, 2017
PubMed
Summary
This summary is machine-generated.

The Radon transform enhances serial spectroscopic experiments by improving speed and sensitivity. This method enables previously infeasible measurements, particularly for low-sensitivity techniques like Nuclear Magnetic Resonance (NMR) spectroscopy.

Keywords:
HSQCMultidimensional spectroscopyRadon transformVariable temperature

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Area of Science:

  • Spectroscopy
  • Data Processing
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Serial spectroscopic experiments generate complex data.
  • Understanding spectral peak shifts under varying conditions (e.g., temperature, pH) is crucial.
  • Low-sensitivity techniques like NMR spectroscopy require enhanced data processing.

Purpose of the Study:

  • To demonstrate the utility of the Radon transform for processing serial spectroscopic data.
  • To highlight improvements in speed and sensitivity offered by the Radon transform.
  • To showcase its application in multidimensional experiments and low-sensitivity techniques.

Main Methods:

  • Application of the Radon transform to serial spectroscopic data.
  • Analysis of spectral peak frequency shifts.
  • Utilizing multidimensional experimental setups.
  • Processing of 15N-HSQC spectra for unlabelled peptides.

Main Results:

  • The Radon transform effectively decodes the rate of spectral peak frequency shifts.
  • Significant improvements in experimental speed and sensitivity were observed.
  • The method proved particularly beneficial for multidimensional experiments.
  • Enabled serial measurements of 15N-HSQC spectra for unlabelled peptides, which were previously infeasible.

Conclusions:

  • The Radon transform is a powerful tool for enhancing serial spectroscopic data processing.
  • It offers substantial benefits in speed and sensitivity, especially for challenging techniques like NMR spectroscopy.
  • This approach opens new possibilities for analyzing complex biological samples and systems.