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Related Concept Videos

NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.0K
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...
2.0K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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...
1.3K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
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.
1.8K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.5K
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....
1.5K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.3K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.3K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

990
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...
990

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VirtualSpectrum, a tool for simulating peak list for multi-dimensional NMR spectra.

Jakob Toudahl Nielsen1, Niels Chr Nielsen

  • 1Department of Chemistry, Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark, jtn@chem.au.dk.

Journal of Biomolecular NMR
|August 15, 2014
PubMed
Summary

VirtualSpectrum generates realistic Nuclear Magnetic Resonance (NMR) peak lists for macromolecules, saving time and resources. This tool enhances NMR data analysis by simulating complex spectral features like peak overlap and noise.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Analytical Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for determining macromolecular structure and dynamics.
  • Acquiring extensive NMR data for protein structure determination is time-consuming and resource-intensive.
  • Existing NMR data simulation tools can be user-unfriendly, molecule-specific, or generate overly simplified data.

Purpose of the Study:

  • To develop a fast, flexible, and robust tool for generating peak lists for multi-dimensional NMR experiments.
  • To enable the simulation of realistic NMR data, including artifacts like peak overlap, noise, and missing signals.
  • To provide a valuable resource for the developmental phase, data analysis, and comparison with experimental NMR data.

Main Methods:

  • Development of VirtualSpectrum, a tool utilizing an analytic expression to represent NMR spectra and derive peak positions.
  • Seamless handling of signal overlap through the analytic spectral representation.
  • Simulation of peak lists for diverse NMR experiments in both liquid and solid states.

Main Results:

  • VirtualSpectrum successfully generates tunable peak lists, mimicking various experimental NMR data qualities.
  • The tool effectively handles peak overlap, a common challenge in solid-state NMR, liquid-state homonuclear and heteronuclear spectra, and spectra of unstructured proteins.
  • Simulations demonstrate the impact of protein size and secondary structure on peak overlap and structure determination accuracy.

Conclusions:

  • VirtualSpectrum offers a significant advancement in NMR data simulation, improving efficiency and accuracy in structural studies.
  • The tool's flexibility and ability to simulate complex spectral features make it broadly applicable across various NMR applications.
  • VirtualSpectrum facilitates more robust data analysis and interpretation by providing realistic simulated NMR datasets.