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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...
283
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.3K
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...
1.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

1.2K
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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Metabolomic Analysis of Rat Brain by High Resolution Nuclear Magnetic Resonance Spectroscopy of Tissue Extracts
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Slice selective absorption-mode J-resolved NMR spectroscopy.

Bikash Baishya1

  • 1Centre of Biomedical Research (Formerly Centre of Biomedical Magnetic Resonance), SGPGIMS Campus, Raebareli Road, Lucknow 226014, India.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 19, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for broadband 1H-1H J-Resolved spectroscopy, significantly reducing dispersive contributions for clearer NMR spectra. The technique enhances spectral resolution and sensitivity, aiding in molecular structure determination.

Keywords:
J-resolved NMRSensitivity enhanced ZS J-RESSlice selective NMRZangger-Sterk pulse element

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Area of Science:

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

Background:

  • Proton Nuclear Magnetic Resonance (1H NMR) spectra often suffer from limited resolution due to chemical shift dispersion and broad multiplet patterns.
  • J-Resolved spectroscopy improves resolution but typically requires magnitude mode, which degrades spectral quality.
  • Existing pure shift and broadband homonuclear decoupling methods aim to mitigate dispersive contributions in J-Resolved spectroscopy.

Purpose of the Study:

  • To develop a broadband 1H-1H J-Resolved spectroscopy method with significantly reduced dispersive contributions.
  • To enhance spectral resolution and sensitivity in NMR experiments.
  • To demonstrate the effectiveness of slice selection combined with gradient-based suppression for improved spectral quality.

Main Methods:

  • Implementation of slice selective excitation, t1 encoding, storage, and detection of in-phase absorptive signals.
  • Utilizing gradient-based suppression of dispersive antiphase signals during the storage period.
  • Employing frequency shifting of slice selective pulses for faster signal averaging without recycle delay, analogous to Zangger-Sterk (ZS) broadband homo-decoupling.

Main Results:

  • Achieved a broadband 1H-1H J-Resolved spectrum with greatly reduced dispersive contributions.
  • Demonstrated that slice selective pulses minimize multiplet patterns by keeping passive spins unflipped.
  • Observed broadband decoupling for a fraction of spins across all slices, similar to ZS decoupling.
  • Reported improved sensitivity, ranging from 4-20% compared to regular J-Resolved 1H NMR signals.

Conclusions:

  • The developed method effectively reduces dispersive contributions in 1H-1H J-Resolved NMR spectra.
  • Slice selection combined with gradient suppression offers a powerful approach to enhance spectral resolution and sensitivity.
  • The technique allows for faster data acquisition, making it valuable for analyzing complex molecular structures.